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Chemistry

Chemistry Featured Answers Introduction What Is Chemistry? Scientific Method

Measurement Quantitative and Qualitative Units of Measurement Unit Conversions Temperature Scales SI System of Measurement Significant Figures Scientific Notation Accuracy, Precision, and Percent Error Density Graphing: independent and dependent variables Drawing Graphs

Matter What is Matter? Everything is Made of Atoms Elements Compounds Mixtures Phases of Matter Phase Changes Separating Mixtures Physical and Chemical Changes Mass Number Net Charge Basic Atomic Structure Atomic Number Isotopes Atomic Mass

The Periodic Table The Periodic Table Metals and Nonmetals Metalloids Periodic Trends in Atomic Size Periodic Trends in Ionic Size Periodic Trends in Ionization Energy Periodic Trends in Electronegativity Periodic Trends in Electron Affinity Valence Electrons

Bonding Basics Bonding Octet Rule Electronegativity Ionic Bonding Covalent Bonding Metallic Bonding Properties of ionic, covalent, and metallic compounds

Ionic Bonds Ionic Bond Formation Ionic Compounds Covalent compounds Metallic Compounds Polyatomic Ions Writing Ionic Formulas Naming Ionic Compounds Ionic vs. Molecular Bonds

Covalent Bonds Covalent Bond Formation Covalent Formulas and Nomenclature Drawing Lewis Structures Resonance VSEPR

Intermolecular Bonding Intermolecular Bonds Polarity of Bonds Polarity of Molecules Hydrogen Bonds Dipole-Dipole Interactions Van der Waals Interactions Properties of Intermolecular Bonds

A Closer Look at The Atom Atomic Models Mass Conservation Laws of Proportions Cathode Ray Tube Experiment Millikan's Oil Drop Experiment Rutherford's Gold Foil Experiment Discovery of the Neutron

Bohr Model of the Atom Transverse waves Light and Electromagnetic Radiation Calculations with wavelength and frequency Planck's constant Atoms and Electromagnetic Spectra Excited States and Ground States Bohr Model of the atom

Quantum Mechanical Model of the Atom The Dual Nature of Light DeBroglie: Wave Characteristics of Matter Orbitals, and Probability Patterns Heisenberg Uncertainty Principle

Electron Configuration s,p,d,f Orbitals Noble Gas Shorthand Quantum Numbers Valence Electrons Electron Configuration

Molecular Orbital Theory Molecular Orbital Theory Sigma Bonds Pi Bonds Molecular Geometry Bonding and Antibonding Orbitals Orbital Hybridization

Chemical Reactions Review of Elements and Compounds Chemical and Physical Properties Chemical Equations Balancing Chemical Equations Chemical Reactions and Equations Redox Reactions Synthesis Reactions Decomposition Reactions Single Replacement Reactions Double Replacement Reactions

The Mole Concept The Mole Determining Formula Percent Composition Empirical and Molecular Formulas

Stoichiometry Stoichiometry Mole Ratios Equation Stoichiometry Limiting Reagent Percent Yield

Phases of Matter Phases of Matter Properties of Solids, Liquids, and Gases Intermolecular Forces of Attraction How Intermolecular Forces Affect Phases of Matter Changes of State Dynamic Equilibrium Vapor Pressure and Boiling Phase Diagrams

Gases Kinetic Theory of Gases Gas Pressure Measuring Gas Pressure Atmospheric Pressure Absolute Zero Gas Laws Boyle's Law Charles' Law Avogadro's Law Gay Lussac's Law Combined Gas Law Ideal Gas Law Molar Volume of a Gas Gas Stoichiometry Partial Pressure Preparation and Reactions of Gases

Solutions Solutions Solute Solvent Solution Formation Solvation and Dissociation Saturated and Supersaturated Solutions Measuring Concentration Solving Using PPM (Parts Per Million) Molarity Molality Percent Concentration Dilution Calculations Osmolarity Factors Affecting Solubility Solubility Graphs Colligative Properties Separating Mixtures

Chemical Kinetics Rate of Reactions Collision Theory Potential Energy Diagrams Rate Law

Chemical Equilibrium Dynamic Equilibrium Equilibrium Constants Equilibrium Stoichiometry Ksp Kep Le Chatelier's principle Solubility Equilbria

Acids and Bases Acids and Bases Properties of Acids and Bases Arrhenius Acids and Bases pH pH calculations Intermolecular Forces of Attraction Stoichiometry with Acid and Base Dissociation Conjugate Acids and Conjugate Bases Brønsted–Lowry Acids and Bases Lewis Acids and Bases

Reactions in Solution Reactions Between Ions in Solutions Stoichiometry of Reactions Between Ions in Solutions Neutralization Titration Calculations Buffer Theory Buffer Calculations

Thermochemistry Energy Change in Reactions Enthalpy Exothermic processes Endothermic processes Specific Heat Calorimetry Thermochemistry of Phase Changes Thermochemistry with Equation Stoichiometry Hess' Law Born-Haber Cycle - Formation Born-Haber Cycle - Solution Spontaneous and Non-Spontaneous Processes Entropy Gibbs Free Energy

Electrochemistry Oxidation and Reduction Reactions Oxidation Numbers Balancing Redox Equations Using the Oxidation Number Method Metal Activity Series Galvanic Cells Electrolysis Calculating Energy in Electrochemical Processes

Nuclear Chemistry Nuclear Chemistry Isotope Notation Isotope Stability Alpha Decay Beta Decay Positron Decay Electron Capture Nuclear Equations Nuclear Half-Life Nuclear Half-Life Calculations Nuclear Transmutation Fission and Fusion Applications of Nuclear Chemistry Biological Effects of Radiation

Organic Chemistry Introduction to Carbon Chemistry Naming Alkanes, Alkenes, and Alkynes Aromatics Functional Groups and Naming Polymer Chemistry Biochemical Molecules Isomerisms

Useful Analysis Tips Using Microsoft Excel for Figures and Statistical Analysis Using Microsoft Excel to Analyze Data Using Linear Regression Correct Use of a Scientific Notation on a Scientific Calculator

Uncategorized Questions Tell how you would prepare a 500.0mL of 0.50 M ammonium carbonate solution? Include all necessary equipment and amount of chemical (in grams). What is the equilibrium concentration of C2O42− in a 0.20 M solution of oxalic acid? Given the following data, what is the heat of formation of methane (CH4) gas? What is stoichiometry? Can you explain the concept? #2H_2S + SO_2 -> 2H_2O +3S# what is the oxidizing agent? What is the reducing agent? For the given equation.... #Ca(NO_3)_2(aq) + CO_2(g) + 2NaOH(aq) rarr CaCO_3(s)darr+ 2NaNO_3(aq) + H_2O(l)#... What will be the effect of adding carbon dioxide? Calculate the amount of heat required to convert 45.0 g of water at 43.0 C to steam at 100.0 C.? What is the chemical formula for the following ionic compounds: Barium Sulfate, Manganese(II) Fluoride? If the change in free energy of formation is zero, is change in enthalpy of formation always zero as well? Help! What happens to plane polarised light when it passes through a solution of sucrose (which contains glucose and fructose)? 85.5 L of fluoride gas is being held at a temperature of 14.5 C. If the temperature were raised to 36.9 C, what would the new volume be? For hydrogen peroxide and chlorine gas that are in the same amount, phase, temperature, and volume, why is it that hydrogen peroxide has greater entropy? What is the degree of freedom for O2? A gas has a volume of 240.0mL at 25.0 celecuis and 600.0mmHg. Calculate it’s volume at STP? The values of Quantum numbers for the 5th electron of boron and last entering electron of potassium? Why is acid more affective at changing color than temperature? PH of 0.015 M HCL is? Acetylene gas (C2H2) is produced as a result of the reaction CaC2(s) + 2 H2O() Õ C2H2(g) + Ca(OH)2(aq). If 10 g of CaC2 are consumed in this reaction, how much H2O is needed? Answer in units of mol. 1.name the methods by which the following mixtures can be separeted? a.kerosene from crude oil b.pure water from sea water Chemistry A/As Level question? HELP! If I want to create a solution with #\text{Fe}^{+3}=0.2\ \text{M}# using #5\ g# of #"Fe"_2"O"_3#, how many #"mL"# of water must I add? Label the diagram. Write the reduction half reaction, the oxidation half reaction and the net reaction as well as calculate the cell potential. ? What orbital is filled immediately after the 4d sublevel is filled? An unknown compound has the empirical formula CH if the molar mass is determined to be 26 g/mol what is the molecular formula? Write the balanced equation for the hydration of CuSO4. Indicate the physical states using the abbreviations (s), (l), or (g) for solid, liquid, or gas, respectively? Which of the following statements about chemical reactions are true? Select all that apply. What is the solubility of #AgBr# in a solution of #AgBr# and #AgSCN#? Given #rarr# #K_("sp AgSCN") =10^(-12)# #K_("sp AgBr")=5xx10^(-13)# Thank you:) Label conjugate base, conjugate acid..? How do you determine the limiting reagent by using the stoichiometric ratio to determine the limiting reactant? A buffer that contains 1.10 mol/L B and 0.700 mol/L BH+ has a pH of 9.65. What is the pH after 0.0045 mol of HCl is added to 0.500 L of this solution? Is H2, a monoatomic or diatomic gas?? Q1) The valency of an element A is 3 and element B is 2. Write the formula of the compound forned by combination of A andB? Air is a mixture of gases.name a gas which: a.makes up the biggest percentage of air? b.is the most active part of air? c.is a noble gas.? How many moles of gas are in a 4.5 meter cylinder at 105K with a pressure of 2.0atm? Why is uncontaminated water colorless? What will Cr2(SO4)3(aq)+(NH4)2CO3(aq) produce? What is the chemical formula and the name of the compound of a binary triatomic molecule? Thomas poured 25 mL of 0.50 M HCl into a large bottle. He then added enough water so that the new (diluted) concentration was 0.10 M HCl. How much water did Thomas add? Ammonia gas occupies a volume of 67.9 L at a pressure of 632.4 atm. If the pressure were lowered to 356.8 atm, what would the new volume be? If Kb for NX3 is 3.0×10−6 , what is the the pKa for the following reaction? HNX3+(aq)+H2O(l)NX3(aq)+H3O+(aq) Which electronic transition in a hydrogen atom will require the largest amount of energy ? (1) n = 1 to n = 2 (2) n = 2 to n = 4 (3) n = 5 to n = 1 (4) n = 3 to n = 2? What are the concentrations of all species in a 0.13 M KF solution? If covalent compounds dont break up into ions then why HCl splits into Hydrogen ion and Chloride ion in presence of water?. What is the probability that an electron energy state in Ge will be occupied at temperature = 300 if the energy state is greater than the Fermi energy by 2 eV? Which having higher bond angle and why #"ClO"_2# or #"ClO"_2^-#? An #80*mL# volume of #NaOH# of #1.00*mol*L^-1# concentration was stoichiometrically equivalent to a #70*mL# volume of #HCl#. What is # [HCl]#? What is meant by #"sp", "sp"^2, "sp"^3# etc .....hybridization? What are the three differences between diffusion and effusion? What is the net ionic equation for the reaction between aqueous calcium hydroxide and nitric acid? The products of this reaction are aqueous calcium nitrate and water. How does this net ionic equation compare to the net ionic equation shown on the trans.? Neutron in zinck? List the possible combinations of all four quantum numbers when n=2, l=1, and ml=0? I'm confused. Common knowledge (and almost all images on the internet) says the electron shells/levels hold 2, 8, 18, 32, etc. in ascending order. Now I am being instructed the shells hold 2, 8, 8.... Is there a simple explanation? What makes a good indicator fro a titration between an acid and an alkali? Determine the volume of one mole of any gas at S.T.P assuming it behaves like on ideal gas? What do we mean by a dynamic equilibrium? Can you describe how the development of a vapor pressure above a liquid represents such an equilibrium? What gas is formed when magnesium and hydrochloric acid are combined? 27. Use Hess’ Law to calculate the enthalpy change for the decomposition of dinitrogen pentaoxide? A #"450. kg"# object has a density of #"1.23 g/cm"^3"#. What is its volume in #"m"^3"#? What is the molar enthalpy of fusion of magnesium? Acid base Equilibrium? How many atoms are in #"4.65 mol C"#? A tank containing #"He"#, #"Ar"#, and #"Xe"# has a total pressure equal to #"3.00 atm"#. The individual pressures are #"0.450 atm He"#, and #"0.350 atm Ar"#. What is the pressure of #"Xe"#? Determine the mass, in grams, of a piece of this metal that has a volume of 15.3 cubic centimeters. Round your answer to the nearest tenth of gram? SHOW YOUR WORK How to dissociate oxalic acid given a kc constant and molarities? If #0.55*mol# of dioxygen react with excess dihydrogen, what mass of water results? The ease with which the charge distribution in a molecule can be distorted by an external electrical field is called the? Paints are generally sold as alkyd (oil based) or latex (water based). To dilute these paints or to clean the paintbrushes, what solvents must be used for each type? Be specific, and explain why each solvent is appropriate A compound A with a molecular formula C3H8O is oxidised with acidified potassium dichromate(VI) to form a liquid B. B reacts with hydrogen cyanide to form a compound C that contains 3 carbon atoms. What are the structures of A B and C? What mass of calcium carbonate will react completely with #4.1*g# #HCl#? An alcohol-water solution is by volume 40.0% isopropyl alcohol. There is 500.mL of the solution. How many mL of alcohol were added to water when preparing the solution? How does #"VSEPR"# affect the shape of the molecule? What is the order of volatility for the alkane series? How do you draw the Lewis structure of carbonate dianion? Grams/Moles Calculations? Is #Zn(s) + AgNO_3(aq)rarr AgNO_3(s)+Zn(NO_3)_2(aq)# balanced with respect to mass and charge? Which is the most abundant element in the universe? The element with highest value of first ionization potential is ? Write the solubility product equation for calcium fluoride (CaF2). ? What is the density of hydrogen sulfide (H2S) at 1.9 atm and 337 K? Answer in units of g/L The mass of MgO is 1.04 g in a reaction. How many moles of MgO were used? Which compound does not obey the rule of octect? A.ch4 B.pcl5 C.nh3 D.h2o How much heat is required to raise the temperature from 26 degree centigrade to 50 degree centigrade for 100 gr lead? Hydrogen can form a maximum of how many bonds? If you put hot water in a test tube, pour food coloring in it, and then put it into a beaker with cold water, what happens? And why does that happen? What is formula for aluminum chloride? What is the mass of #"H"_2"# required to react with #"1.40 g N"_2"# in the reaction: #"N"_2 + "3H"_2"##rarr##"2NH"_3"#? What is ΔH in kJ for the reaction below? What is bohr midel of atom? What mass of #"O"_2"# can be produced from the decomposition of #"3.76 g KClO"_3"#? Define oxidation - reduction in terms of electrons? Describe a condition where we could find water in liquid form where temperatures exceed 100C? When a non metal on right side of pt bonds with non metal on right side of pt it is called? Is astatine likely to be gas ,a liquid ,or solid ? What mass of hydrogen is present in a mixture of #H_2#, #CO#, and #O_2# at #765*mm*Hg# at #23.8# #""^@C#, that contains #8.0*g# #CO#, and #12.0*g# #O_2#? Need help with Hess law problem cant come up with third equation? What happens when a saturated solution undergoes heating or cooling? What is #DeltaH_"enthalpy of formation of ethylene"^@#? Balance the equation ? C4H10 (g) + ? O2 (g) Õ ? CO2 (g) + ? H2O (g), using the smallest possible integers. What is the coefficient of CO2? A 10 kL weather balloon containing He at 25 C drops onto an ice field at - 25 what would its volume be if the the pressure remains constant? Find the value of n,l,m for 3p4? E. Gallium metal has one of the largest liquid ranges of any element. It melts at #30°"C"# and boils at #1983°"C"#. What are its melting and boiling points in Kelvin? Find out all quantum numbers for 15th electron of chlorine? Natural gas (assume pure methane) reacts with oxygen in the air to heat most homes in Alberta. Predict the mass of oxygen gas required to react completely with 1.00L of methane,with all gases measured at SATP.? What are comparisons between electrons, beta particles, and positrons? Which of the following statements is/are true about the kinetic molecular theory of gases? How to calculate oxidation number of C6H5OH? How many grams of calcium nitrate are needed to make 3.30L of a 0.10 M solution? If 35.0mL of ethanol,C2H5OH, were added to 65.0mL of water, what is the percent by volume of the solution? What is the difference between an element and a coumpound? What is the molarity of: 40.0 grams of sodium hydroxide in 1.50L of solution? What is the molarity of: 4.10 grams of magnesium chloride in 300.mL of solution? What is the ClO− concentration of a mixture that is 0.310 M in HF and 0.100 M in HClO? What is #"SAE30"# oil? What is the mass of ONE glucose molecule? Compare and contrast isotopes and atoms ? What is your limiting reactant if 32 grams of CH4 reacts with 32 grams of oxygen gas? Chem Help???? What is the metal point of sodium phosphide? WHat is the mass of iron produced when 125g of C0 reacts completely using the following reaction FE2O3(S)+3CO(g)->2 Fe(s)+3 CO2(g)? Why is a person suffering from acidity is advised to take an antacid ????? What is the formula of Barium chloride? 1). What is the Lewis structure for #"SeF"_4#? 2). What is its electron geometry? 3). What is its molecular geometry? 4. What is its hybridization? 5. How would you classify it in the #"AXE"# system? 6. What are the ideal bond angles? How does Methane and Diamond differ in terms of structure and properties? Is salt a mixture ? What is the mass of lead in 100 cf of bullet waste that is (by mass) 90 % lead, 5 % copper, and 5 % waste? What is the [OH−] for a 0.026 M solution of Sr(OH)2? Concentration at equilibrium? What is the charge on a hydrogen ion? What is the mass number of boron? If I combine two solutions of known concentrations and volumes, can I calculate the concentration of the new solution by adding the two concentrations together and dividing the result by 2? How can I find the amount of solute in a solution if only the volume of solution is given ? What is the equilibrium pressure of I2(g) in this mixture? Account for the enthalpy and entropy change for... #C_2H_4(g) + Cl_2(g) rarr C_2H_4Cl_2(g)# #DeltaH_"rxn"^@=-270.6*kJ*mol^-1; DeltaS_"rxn"^@=-139.0*kJ*mol^-1;# Is the reaction spontaneous at room temperature? Explane mole concept? We are given.... #Ca(s) + 1/2 O_2(g) -> CaO(s)# #;DeltaH_1^@ = -635.1*kJ*mol^-1# #CaCO_3(s) rarr CaO(s) + CO_2(g)# #;DeltaH_2^@ = 178.3 *kJ*mol^-1# What is the enthalpy of reaction for #Ca(s)+1/2O_2(g) +CO_2(g) rarr CaCO_3(s)#? What is the oxidation number of nitrogen (N) in HNO2? What is the function of the cathode in an electrolytic cell ? What is the oxidizing agent in the following net ionic equation of a reaction? 4H+ (aq) + SO4^2-(aq) + 2NaI (s) --> 2 Na+ (aq) + I2 (s) + SO2 (g) + 2 H2O (l) If 6.1 kg of Magnesium reacts with an unlimited amount of Oxygen, how much Magnesium oxide is produced? 2kbr(aq)+cl2(aq)>2kcl(aq)+br2(l) When 0.855g of cl2 and 3.205g of kbr are mixed in solution, which is the limiting reactant? Determine the mass of copper deposited at the cathode by a current of 0.05A flowing through aqueous copper (II) sulphate for 30minutes? How many moles of cobalt(III) bromide are in #"9.94 g"#? How can I balance this Chemistry equation? #Cu+HNO_3 -> Cu(NO_3)_2 + NO_2+ H_2O# How many grams of #HCL# must you dissolve in #1400\ mL# to make a solution with #pH=2.7##\ \ #? Why do ionic solids tend to have melting points hundreds of degrees higher than molecular solids? What is the net ionic equation for the reaction between ammonia and ammonium ions in a buffer solution? What is the pH of a buffer prepared by mixing 150 mL of 0.60 mol/L ammonium chloride and 100 mL of 0.90 mol/L aqueous ammonia (#"p"K_text(b) = 4.75#)? Which of the following are pure substances and which are mixture? What is the wavelength of radiation with a frequency of #"540 Hz"#? What is a double replacement reaction? How do you write the molecular and net ionic equations? If 82.3 L of an ideal gas is cooled from 46 C to -166 C what will the volume of the gas become? Why is the boiling point of water less than a hundred degrees celsius at higher altitudes? Why is NH4 ion formed? How many grams of #\text{NH}_4\text{OH}# do I need to make #400\ \text{mL}# of a #0.45\ \text{M}# solution of #\text{NH}_4\text{OH}#...? Why are ideas on the nature of matter different from those held 200 years ago, and different from those held 2500 years ago? Find the molar quantity of #BCl_3# in #1.51*g# of this substance. What is the mass, and molar quantity of boron here? Awesome. Also need help on these two? What is meant by #k_f#? If #10*g# of calcium carbonate is heated to decomposition, what volume of #CO_2(g)# will result at #"STP"#? What mass of #"mercuric oxide"# is required to generate #2.56xx10^24# #"dioxygen molecules"#? How are electrons arranged in a metal? Can you help? A sample of blood or tears has a pH of 7.4. What is the hydronium ion concentration of this solution? Which solution contains the greatest number of molecules? #"A."# #"One kilogram of water;"# #"B."# #"One kilogram of heavy water;"# #"C."# #"1100 g of water;"# #"D."# #"1100 g of heavy water?"# How do you separate calcium carbonate from a slurry? What sort of bonding exists in common salt? What are the solution beahviours of #"aluminum hydroxide"#, and #"sodium carbonate"#? Redox half reaction problem? After reacting all of the #FeS# in a #1.5\ L# of a reaction solution that had #[FeS]=0.2\ M#, how many grams of #Fe_2O_3# were formed? #" "# # # #4FeS+7O_2\rightarrow 2Fe_2O_3+4SO_2# Potassium cyanide is a toxic substance. The median lethal dose of KCN for a person weighing 145 lb (65.8 kg ) is 9.29×10−3 mol . What volume of a 0.0520 M KCN solution contains 9.29×10−3 mol of KCN? Thank you Can you help? A #0.10*mol*L^-1# solution of #"acetic acid"#, is #1.3%# dissociated. What is #K_a# for #"acetic acid"#? What is the concentration of a mass of #125*g# of copper sulfate dissolved in a #1*L# volume of water? Is the product of PV has SI unit of atmdm^3?if no why? Why can #CO_2# be easily solidified? Will the value of the factor, A, in the Arrhenius equation increase or decrease as the size and complexity of the reacting molecules increase? The volume of a sample of hydrogen gas was decreased from 13.16 L to 6.45 L at constant temperature. If the final pressure exerted by the hydrogen gas sample was 7.73 atm, what pressure did the hydrogen gas exert before its volume was decreased? A balloon filled with helium has a volume of 16.2 L at 289 K. What volume will the balloon occupy at 257 K? At releatively high pressure,vanderwaal's equation reduces to what? If 0.885 moles of copper (II) sulfate are dissolved in enough water to make 70.0mL of solution, what is the molarity of the solution? What is the molarity of a 400.0mL solution in which 3.70 moles of Sodium acetate are dissolved? How do I plot the energy eigenvalues and wave function solutions of a delta function double potential well with #V(chi) = alpha(delta(chi+L)+delta(chi-L))#? How to plot the transmission coefficient as a function of #E//V_0#? In a gaseous mixture of THREE components, #P_"Total"=17.3#, #P_"He"=3.16*atm#, #P_"Ar"=1.44*atm#, what is the partial pressure of the third component, #P_"Ne"#? #P_"Ne"={17.3-3.16-1.44}*atm# You require 0.100 L of a buffer with pH = 4.35. On the shelf is a bottle of benzoic acid/sodium benzoate buffer with pH = 3.95. ?? Which would be best to determine if an element is a metalloid? How to do 16th question? Write a net ionic equation for the reaction that occurs when aqueous solutions of sodium hydroxide and nitrous acid are combined? A certain quantity of electric charge produces 5.0g of silver from an aqueous solution of silver nitrate. When the same amount of charge is passed through an aqueous solution containing the #X^n+# ions , 3.02g of X is produced.,What is the value of n? Which has more entropy egg or boiled egg? Which of the following gas has the rate of diffusion 0.88 times that of Phosphine (PH3) ? why does graphite conduct electricity whereas diamond doesn't? Explain. What is the oxidation no. Of Mn in MnCl2? Given... #C(s) +O_2(g) rarr CO_2(g)# #;DeltaH^@=-394*kJ*mol^-1# #(i)# #Pb(s) +1/2O_2(g) rarr PbO(s)# #;DeltaH^@=-217*kJ*mol^-1# #(ii)# #PbO(s) +CO(g) rarr Pb(s)+CO_2(g)# #;DeltaH^@=-66*kJ*mol^-1# #(iii)# How do we find #DeltaH_f^@CO(g)#? F. what is the orbital diagram and the corresponding electron configuration of 26Fe? A solution of Potassium nitrate has a concentration of #0.2# #"mol dm"^-3#. Calculate how many moles of potassium nitrate are dissolved in #10# #"cm"^3# of the solution? If #30.9*g# calcium nitride are obtained from #65.5*g# of metal, what is the percentage yield of the reaction? #"28.5 g"# of iron shot is added to a graduated cylinder containing #"45.5 mL"# and the volume of water in the cylinder increases to #"49.1 mL"#. What is the density and specific gravity of iron? What is the mass of #"5 mol SO"_2"#? What volume of a #"2.0 M"# stock solution is required to produce #"500 mL"# of a #"0.49 M"# solution? What mass of oxygen will be produced from the reaction between #"6.95 g"# of sodium peroxide #("NaO"_2")# and water? 28.5 g of iron shot is added to a graduated cylinder containing 45.50 ml of water. The water level rises to the 49.10 mL mark, from this information, calculate the density of iron? Calculate the amount of heat required to raise the temperature of an 83 g sample of water from 36 c to 69 c ? Which is weakest #H-X# bond for the series #HI#, #HBr#, #HCl#, and #HF#? Which material contains both covalent and ionic bonding: #A.# #K_3PO_4#; #B.# #KCl#; #C.# #H_2SO_4#; #D.# #K_2O#? Balance the equation ? C4H10 (g) + ? O2 (g) Õ ? CO2 (g) + ? H2O (g), using the smallest possible integers. What is the coefficient of CO2? When 50 mL of liquid water at 25 °C is added to 50 mL of ethanol (ethyl alcohol), also at 25 °C, the combined volume of the mixture is considerably less than 100 mL. What is a possible explanation for this? What are the differences between systematic errors and random errors? When naming ionic compounds, when is '-ate' used instead of '-ide'? What two elements for chloroform? Calculate the molar solubility of Zinc II Phosphate(Zn3(PO4)2). Ksp = 9.0e-33. ? Which of the equations below is correct for the following Ksp expression? Ksp = [Cd2+][OH-]2 Select one or more: what is 0.004694 Converted into scientific notation? What do we mean by the term #"mole fraction"#, with respect to a solution? Elemental iodine is a stable solid in a sealed jar at room temperature. However, when the jar is opened for a long time, the iodine undergoes sublimation and disappears. Predict the relative pressure of the triple point for iodine. What? If i add 45 gram of sodium chloride to 500 gram of water , what will the freezing and boiling points be of the resulting solution ? Predict whether the change in entropy, for the following reaction will be positive or negative H2(g) + (1/2) O2(g) Õ H2O(g) . Why is this positive, even though there are less mols in the product? Consider an ammonia/ammonium chloride buffer. Kb for ammonia is 1.8 10—5. Select all the correct statements from those listed below? What mass of oxygen gas can be be produced when 1.15 g sodium peroxide reacts with excess water? How many moles of silver are in #8.907xx10^27# #"atoms Ag"#? What is the chemical formula for calcium oxide? A sample of a compound was found to contain #29.16%# nitrogen, #8.39%# hydrogen, #12.50%# carbon, and #49.95%# oxygen. What is its empirical formula? How do you name and represent #"H"_3"CCH(CH"_2"CH"_3")CH(CH"_3")CH"_3#? How many moles of ions are in a solution that contains 1.5 mol of #"HCl"#? What happens if you add #"H"_2"SO"_4# into water? What about if you combine #"H"_2"SO"_4# and #"HNO"_3#? A reaction of 50.1 g of Na and 31.7 g of Br2 yields 33.4 g of NaBr. What is the percent yield? 2Na +Br2______2NaBr A buffer solution was prepared by mixing 391 mL of 0.431 M NaOCl and 299 mL of 0.391 M HOCl. Calculate the pH of the solution given that Ka (HOCl) is 3.2 x 10-8. Answer in 3 decimal places.? How does #"ammonium hydroxide"# react with #"acetic acid"#? When #FeO# is oxidized further to #Fe_2O_3#, is the reaction exothermic? Why do liquids have a vapor pressure?Do all liquids have vapor pressures? Do solids exhibit vapor pressure? How does vapor pressure change with changing temperature? Why in beta decay there is an increase and decrease in atimic number by release of electron or positron What causes the change? If 10g O2 and 200g C12H24 are ignited, what volume of CO2 gas can be produced at STP? How to calculate n factor in non-redox reactions and other such reactions? When an electron is accelerated through a particular potential field,it attains a spped if 9.47×10^6 m/s. 1)what is the characteristic wavelength of this electron? 2)Is the wavelength comparable to the size of atoms? L=4 subshell?? How to find the pH when adding unknown amounts of weak acid into known amounts of strong base?? Calculate the pH during a titration when 10.00mL of 0.098 M HCl has reacted with 9.35 mL of 0.02 M NaOH? It takes #7.21 xx 10^-19\ "J"# of energy to remove an electron from an Fe atom. What is the wavelength of light that can do this? How many nitrogen (N) atoms are there in 2.10 moles of nitrogen molecules (N2)? Can someone please explain me? I have some questions about the Periodic Table...(sorry for any grammar mistake) Is the reaction #"2Al(s) + 3CuSO"_4"(aq)" Õ "Al"_2("SO"_4)_3"(aq)"+"3Cu(s)"# spontaneous? When you blow air into a balloon, not only there will be increase in it's pressure but also it's volume. Is it a violation of Boyle's law? What prefix should we use for #1//1000#? Why is a monosodium phosphate solution acidic? What is the oxidation number of nitrogen in Cu(No3)2? What masses are associated with ... #a.# a #1.5*"mole"# quantity of potassium; #b.# a #2.5*"mole"# quantity of carbon; #c.# a #1.5*"mole"# quantity of potassium; and #d.# a #12.5*"mole"# quantity of helium? If #1*L# of nitrogen is treated with #3*L# of hydrogen gas, how much ammonia will result? The Ksp of cobalt(II) hydroxide, #Co(OH)_2#, is #5.92 × 10^-15#. Calculate the molar solubility of this compound? Should we always convert units of temp. and pressure while using the gases' laws?? like when we are using (P1V1=P2V2) can we just substitute the unit of P in kpa or in mmHg Consider the compounds shown below along with their solubility product constants: Co(OH)2 Ksp= 1.60e-15 CdCO3 Ksp= 5.20e-12 Cd(OH)2 Ksp= 7.20e-15 ? How would you complete this equation to give the formula of the products? How much g of pure zinc will be obtained when 8.15g pure ZnO IS reduced by carbon reduction process.....? Two iron bolts of equal mass one at 100° C, the other at 55°C are placed in an insulated container, assuming heat transfer is negilble, what is the final temperature of the container? (c of iron =0.450 j/g* °C) What is the density of a #200*g# mass of material, that has a volume of #40*cm^3#? In the redox reaction: Cr2O72- + Fe2+ --> Cr3+ + Fe3+. What would the balanced reaction look like, and would CrO72- be the Reducing Agent, and Fe2+ be the Oxidizing Agent? What is meant by concertration of a solution? How will you prepare a 10% of glucose by mass in water? #40*mL# of sulfuric acid with a concentration of #0.05*mol*L^-1# was titrated with #50*mL# volume of #NaOH(aq)#. What was the concentration of #NaOH(aq)#? What happens at the anode and cathode in a voltaic cell? What are the types of intermolecular forces acting in the liquid state of krypton? What are the ones acting in the liquid state of nitrogen fluoride? What is the molarity of sodium hydroxide solution? Carbon tetrachloride is a nonpolar solvent. What are the intermolecular forces of attraction that exist in carbon tetrachloride? 16.52 g of saturated solution of a salt at 298K gave 142 g of dry salt .calculate the solubility of salt? What volume of a concentrated HCl solution, which is 36.0% HCl by mass and has a density of 1.179 g/mL, should be used to make 5.10 L of an HCl solution with a pH of 1.7? Half life of iodine -131is 8days and its weight is 20mg After 4half lives the amount left undecayed will be? Why is hydrogen gas at room temperature ? Calculate the standard enthalpy change in a reaction? PbO(s) + CO(g) = Pb(s)+ CO2(g). . Why the meniscus of the most liquids curve downwards while the meniscus of Mercury curves upwards? The scattering of light by the dispersed phase is called? (a) Brownian movement (b) Tyndall effect (c) Adsorption (d) Electrophoresis What is the symbol equation for the reaction of lithium oxide and sulfuric acid?(balanced and with state symbols) 2 / fill in the blanks for the carbon family.? How many significant digits are in #22/7#? What will be the concentration of a solution when 20g of potassium nitrate is dissolved in water to a final value of 500ml? A #3.0*g# mass of magnesium metal is combusted in a #2.0*g# mass of oxygen gas. What mass of magnesium oxide results? What is the formula and symmetry of #"dicyclohexyl ether"#? Hi, how do I know which is product and which is reactant, when there are just plus signs? Or just arrows? What is the molar absorptivity according to the following data? How many grams of ice at -13.1 C can be completely converted to liquid at 26.5 C if the available heat for this process is 5.52×103 kJ ? How does copper carbonate react with hydrochloric acid? What is meant by the term normal boiling point? How many molecules are in 2.10 mol CO2? According to this diagram write the reduction half reaction? Convert 180 grams of water to molecules of water? A 20.0 ml solution of Sr(OH)2 is neutralized after 25.0 ml of standard 0.05 M HCI is added. what is the concentration of Sr(OH)2? 2HCI+Sr(OH)2 2H2O+SrCI2 A nitrogen gas laser pulse with a wavelength of 337 nm contains 3.83 mJ of energy. How many photons does it contain? Bonding in silicon? What Is the mass of water absorbed by a mixture containing 2 g of #"CaCl"_2# and 2.5 g of #"K"_2"CO"_3#? How can you find the relative mass of an object given the mass in grams? For example quarters, nickels, dimes etc. During an acid base titration hydrochloride acid is filled in burette up to zero mark and 20 ml of 0.085M Na2CO3 solution is pipette out into flask using indicator: a) if burette reading at end point was noted to be 13.7ml determine molarity of HCl? Methanol. The change in standard free energy for the synthesis of liquid methanol from gaseous carbon monoxide and hydrogen is -29 kJ/mole of methanol. Write the balanced reaction equation, the equilibrium constant expression? What would be the correct formula of a ionic compound formed if a certain metal M with valence electron configuration Ns2 reacted with a nonmetal valence electron Ns2Np4? As you move from row ______ to row ______ in the periodic table, the atomic radius of the elements DECREASES.? A) 1 to 7 B) 1 to 18 C) 7 to 1 D) 18 to 1 The density of aluminium is 2700kg/m^-3.calculate the mass of a block of aluminium which has a mass of 20 cm3? If you add 25 g of sugar to 50 mL of water what would the final mass be? Only 235U can be used as fuel in a nuclear reactor, so uranium for use in the nuclear industry must be enriched in this isotope. If a sample of enriched uranium has an average atomic mass of 237.662 amu, what percentage of 235U is present? Acetic acid (HC2H3O2) is an important ingredient of vinegar. Acetic acid is a monoprotic acid. A sample of 50.0 mL of a commercial vinegar is titrated with 1.00 M NaOH solution. What is the concentration of acetic acid in the vinegar if 5.75 mL of the..? What causes matter to change states? The temperature off 200.0 mL of a gas originally at STP is changed to -25 degrees at a constant volume. What’s the pressure of gas in atm? How many molecules are in 8.50 moles of H2O? 7 Which events in daily life cause the formation of CO2? What percentage of the total mass of the compound #KAl_2S_2O_3# is due to the sulfur in the compound? In the following reaction, 451.4 grams of lead reacts with excess oxygen forming 359.9 grams of lead(II) oxide. Calculate the percent yield of the reaction? 2Pb(s)+O2(g) --> 2PbO(s) Carbon reacts w sulfur 2 form Carbon disulfide ? Initially there are 700 grams of a radioactive substance on hand. Suppose the half-life of the substance is 7 hours. Construct an exponential model A(t) = A0ekt for the amount remaining of the decaying substance? If the equivalent wt of a trivalent metal is 37.7,the molecular weight of its chloride is? What are some of the implications of the fact that, unlike most substances, water expands in volume when it freezes? What happens when I give dilute H2SO4 in 2-Methyl propanol? What is the concentration (M) of KCl in a solution made by mixing 30.0 mL of 0.100 M KCl with 50.0 mL of 0.100 M KCl? What is the density of a piece of wood that has a mass of 25.0g and a volume of 29.4cm3? Is sodium chloride dangerous in small doses? If you are gonna answer the question please cite thank you for your help.. :) Adding a solution of KSCN to a solution of #Fe^{3+}# salt , forms a blood-red complex. What is that complex #K_3[Fe(SCN)_6] \ or \ Fe[Fe(SCN)_6]# ? Why is Na the largest radius? In the presence of sodium fluoride, #25cm^3# of 0.4moldm-3 aqueous iron()sulphate requires #25cm^3# of 0.10moldm-3 aqueous potassium manganate()for complete reaction.What is the final oxidation state of manganese? Verify the change in oxidation number.......2Cu2O(s)+Cu2S(s)---6Cu (s)+SO2(s)? Gibbs Free Energy. Why are equilibrium constants for a chemical reaction temperature dependent? Formic acid (HCOOH), Ka = 1.8 X 10-4, is the irritant associated with ant stings. Calculate the equilibrium concentrations of all species, HA, H+, and A-1, of an aqueous solution containing 18.0 g of formic acid per liter. ? Formic acid (HCOOH), Ka = 1.8 X 10-4, is the irritant associated with ant stings. Calculate the equilibrium concentrations of all species, HA, H+, and A-1, of an aqueous solution containing 18.0 g of formic acid per liter. ? Would someone please help me? When doing isomers of pentene, how do you know that you have 6? A sample of blood or tears has a hydrogen ion concentration of 3.98e-8M. What is the pH of this solution? Al3+ is a symbol for aluminum? How many grams of silver chloride (AgCl) can be produced if you start with 4.62 grams of barium chloride (BaCl2) ? Must show all work How much heat does a freezer remove when it converts 600 g of water at 21 °C to ice at -21 °C? Can we name the compound below as 1-#sec#-butyl-4-methylcyclohexane? How did Ernest Rutherford's alpha particle scattering experiments help him to reject the 'plum pudding' model of the atom and create a more accurate model? Calculating Ksp of calcium hydroxide? Which of the following chemical reactions is excepted to produce a precipitate? A. Ca(OH)2(at) + HCI (aq) B. Ca (OH)2 (at) + Na2SO4 (aq) C. Ca (OH)2 (at) + HNO3 (aq) D. All of the above reactions will produce precipitates What is the percent concentration when 9 g nacl are dissolved in 300ml of water? #? C_6H_6+? O_2 -> ? CO_2 + ? H_2O# using the smallest possible integers. The coefficient of H2O is How do you find the limiting reagent?? In the following reactions, ZnO is respectively acting as a /an ? What mass of ethylene glycol( non -volatile, non ionizing, 62.1g/mole) is neededto prepare 10.0L water(#rho = "1 g/mL"#) with a freezing point of ( -23 degree celcious) ? How many grams of hydrogen would be contained in #4.53 × 10^24# molecules of HCl? In a titration experiment, a student finds that 25.49 mL of an NaOH solution is needed to neutralize 0.7137 g of a potassium hydrogen phthalate (KHP, a monoprotic acid with the formula KHC8H4O4). What is the concentration of the NaOH solution? Why "Zn" creates complicated compound, Wheather it is not a transition element? #"C"_2"H"_(4("g")) + "O"_"2(g)" Õ "CO"_"2(g)" + "H"_2"O"_"(g)"# What is the coefficient of #"O"_2# in the balanced equation? How many joules of heat are released when 50 grams of water are cooled from 70C to 60C ? What is the OH concentration if the pOH is 6.009? What volume of 0.20M Ca(OH)2 will neutralize 45.0 mL of a 1M solution of HClO3? Magnesium has an atomic number of 12. Which of the following statement is true of a neutral magnesium atom? When 66.8g of (O2) gas is mixed with 27.8g of (NH3) gas and 25.1g of (CH4) gas, 36.4g of (HCN) gas is produced. What is the percent yield of HCN in this reaction? Phenylacetic acid (HC8H7O2) is one of the substances that accumulates in the blood of persons with phenylketonuria, an inherited disorder that can cause mental retardation and even death. A 0.033 M solution of HC8H7O2 is found to have a pH of 2.9. ? Do solutions have a definite composition? The mass of a block of metal (11:5+-0.5)kg and its volume is (1000+-20)cm3 how would you express the density of the metal? A sample of blood or tears has a pH of 7.4. What is the pOH of this solution? If a 0.0075 liter solution contains 0.0877 moles of CuCO^3, what is the molarity? The density of a balloon will decrease if? After 11.0 mol of propane is partially burned burned to form carbon dioxide, 6.30 mol of propane remains. What is the number of moles of oxygen that the reaction consumes? Na......nacl ? Science. Ch Is #"F"^(-)# a Lewis acid? Why is sublimation of iodine an example of physical change? How do you calculate the vapor pressure at 50°C of a coolant solution that is 52.0:48.0 ethylene glycol-to-water by volume? At 50.0°C, the density of water is 0.9880 g/mL, and its vapor pressure is 92 torr. 158 mL of a 0.148M NaCl solution is added to 228 mL of a 0.369M NH4NO3 solution. What's the concentration of ammonium ions? Choose the correct answer for the following question? What is the electron configuration of carbon (_6^12)c element? 2,4 2.2,2 2.8,2 2,1,3 A sample of blood or tears has a pOH of 6.6. What is the hydroxide ion concentration of this solution? A sample of household bleach has a pH of 12.5. What is the hydroxide-ion concentration of this solution? What does it mean when chemists say that a reactant is reduced? 239Pu has how many neutrons and electrons? How many calcium atoms are required to bond with sulfur to make calcium sulfide? Why are ionic compounds easily soluble in water? A mixture of He, Ne and Ar has a pressure of 7.85 atm. If the Ne has a mole fraction of 0.47 and Ar has a mole fraction of 0.23, what is the pressure of He? A) 4.2atm B) 3.7 atm C )1.8 atm D) 5.5 atm E 2.4 atm A 96gram of sample of radioactive nuclide is placed in a container after 12min only 6gm of sample is undecayed .what is the half life of radioactive nuclide a)8hr b) 6hr c) 3hr? An organic compound with a vapour density of 45 was found to contain 54.5% carbon and 9.1% hydrogen calculate the molecular formula of the compound? How much energy (J) is requried to raise 5.00 g of aluminum from 16.0 to 21.0 C? What is the maximum amount of CO2 which could be formed from 14.49 g of CO and 0.13 mol of O2? How many liters of oxygen are needed to burn 10 liters of carbon monoxide? Refer to the MCQ below.? How many Protons And Neutrons in these isotopes? Given ΔH° for the following reactions:H2(g)+O2(g)á 2H2O(l):Cu(s)+1/2 O2(g)á C uO(s)_What further data is needed, if any,for calculation of ΔH° for the following reactions? CuO(s)+H2(g)á C u(s)+H20(g) In a ionic bond, the atom with the highest electro negativity will have a positive or negative charge?. What is the colour of scandium? 'A sample contains both CO2 and Ne in unknown quantities. If the sample contains a combined total of 1.75 mol and has a total mass of 65.3 g, what are the percentages of CO2 and Ne in the sample by mole? Boric acid is written as H3BO3 or B(OH)3...but if it is written as B(OH)3...why is it still an acid and not a base? A large family of boron-hydrogen compounds has the general formula BxHy . One member of this family contains 88.5% B ;the remainder is hydrogen. What is its empirical formula? A sample of stomach acid has a pOH of 12.60. What is the pH of this solution? The OH- conc. In 10^-7N NaOH Solution? Will someone please help me with this? Thank you so much!!! Why are the gas chromatograms of fresh petrol and partially evaporated pertol differnt? For the reaction N2O4 <--> 2 NO2 (a) What is the equilibrium expression? (b) If [N2O4] initial = 0.25 M and K = 4.5 what are the concentration of reactants and products at equilibrium? How much carbondioxide produced on heating of 1 kg of carbon? We all have observed that ice floats on liquid water. Why? What is unusual about this? What is 'Ionic Radius'? How many moles of gas are in Helium, Nitrogen gas, and Methane? Find the empirical formula for a compound which contains 32.8%chromium and 67.2% chlorine? How many moles of ammonia forms when 2 moles of nitrogen and 6 moles of hydrogen? For the reaction 2 A + B <--> C, the equilibrium concentrations are found to be: [A] = 1.8 X 10^-2 M, [B] = 2.4 X 10^-3 M, and [C] = 5.3 X 10^-4 M. What is the value of Keq? Why is the product of vegetable oil and methanol a better fuel than vegetable oil itself? What is the mass of aluminium thatbwould be obtained from 9 tonnes of aluminiun oxide? Codeine contains a basic nitrogen atom that can be protonated to give the conjugate acid of codeine. Calculate the pH of #1.1x10^-3#M of codeine if the pKa of the conjugate acid is 8.21? What is the balanced equations for the reaction between cyclobutane and excess chlorine in the presence of light? What bonding types affect the melting and boiling points of Alkaline Earth Metals? In the reaction Na2CO3+HCl-> NaHCO3+NaCl,the equivalent weight of Na2CO3 is? What is the difference between nonbonding and antibonding orbital? What is the difference between a shell and a subshell? Explain VSEPR theory? A planet has very low atmospheric pressure compared to Earth. Assuming the surface temperatures on both planets are the same, where will 1.0 L of water boil first? What physical transformation is occurring when naphthalene balls gets smaller as time goes by? How many protons does ammonium chlorate have? A 100 g sample of water is made from the reaction of 11:21 g of hydrogen and 88.79 g of oxygen. What percent of the total mass of the water is made from hydrogen? What about oxygen? Plz help Empirical formula for carbon oxygen and chlorine? Calculate ΔH°298 for each of the following reactions using suitable chemical data book.? 1. 3Zn(s) + Al2O3 á 2Al(s) + 3ZnO(s) 2. MgCO3(s) á MgO(s) + CO2 The equilibrium constant Kc for the reaction below is is 5.555×10-5 . C<--->D+E The initial composition of the reaction mixture is [C] = [D] = [E] = 1.9110×10-3 M. What is the equilibrium concentration for C, D, and E? What is a meniscus? Why is it necessary to know about it when measuring liquids? How many liters of a 3.0M H3(PO4) solution are required to react with 4.5 g of zinc? What are the elements similar to the property of silicon? What happens to non-metals when they form an ion? A sample of carbon is 98% carbon-12 and 2% carbon-14. What is the average atomic mass of this mixture of isotope to the hundredths place? Please expalin how i can solve this problem: Consider 0.10M solutions of the following. Which soluion will have the highest total concentration of ions? A) HCl B) NaOH C) AlCl2 D) C6H12O6 Periodic Table Trends 1. What is the trend in ionic radius across a period? Down a group? 2. What is the trend in electronegativity across a period? Down a group? Using your knowledge of atomic structure, what the explanation for this trend? In general, what happens to metals when they form an ion? What is the pH at the equivalence point of the titration of 30 mL of 0.2 M nitrous acid with 0.1 M NaOH at 25 °C? What is the trend in atomic radius across a period? Down a group? Using your knowledge of atomic structure, what the explanation for this trend? What is the atomic mass of an element if 1 gram of an element is converted into 1.08 grams of oxide? (specific heat capacity=0.06 cal per degree centigrade per gram) What are atoms? Why water is monodentet? Wheather it has two Pairs of lonely electrons? If you had 0.5 M KCl solution, how many moles of solute would you have in 1 Liter of solution? Why are organic compounds thetmallt insatable? What pressure (in ATM) is exerted by a mixture of 2g of H2 and 8g of N2 at 273 in 10L container? Given that:[ H=1: N=14;Molar gas constant,R=0.0821 atmLmol] Kolesaruim is a radioactive substance with a half life of 333 years. How long will it take for 95 percent of a given amount of kolesarium to decay? Why organic compounfs have low melting and bowling point values? Which elements are present at extreme left side of a periodic table? Which of the following aqueous solutions has the lowest #[OH^-]# ? Identify the element indicated by each electricity configuration how do you do it? How many moles of hydrogen are needed to produce 25.13 g of water? What is the formular for copper sulphate? Q) Say you're doing an experiment and it requires a buffer solution with pH 9.15. Calculate how much NH4Cl must be added to 500mL of 0.1M aqueous ammonia to achieve this. (Kb NH3 = 1.8 x 10^-5)? Doubt in Law of equivalents? Calculating the concentration of excess HCL in E ? How to do 166th question? The concentration oh hydrogen ion in a sample of soft drink is 3.8×10^-3 m. What is its ph? In the Henderson-Hasselbach Equation, are the concentrations of the base and acid the equilibrium concentrations or the initial ones? What does it mean when chemists say that a reactant is a reducing agent? Is Francium (Fr) likely to be reduced in a chemical reaction? Would it be easy or difficult to separate Francium from ores? Explain Does grinding solid to powder help to make it easier to dissolve? Explain What can be the least energy of a system as per Heisenberg's uncertainty principle? Calculate for the molarity of 1.0L sodium chloride solution containing 250.0 grams NaCl (FW=58.44g/mol)? Bottled mineral water contains 25ppm calcium. How many milligrams of Ca does one take when one drinks 500.0 mL of bottled mineral water? The density of an unknown metal was determined to be 2.85 g/mL. The actual density was 2.70 g/mL. What is the percent error in this determination? Can someone help me with this chemistry question? What happens to the pressure of a gas when the amount of gas increases? Thanks! Can someone mention me four compounds which can be termed as pure substances...? Logan is cooking, and he wants to increase the boiling point of the water. Which solute would not be a good choice as it would not increase the boiling point as much as the others? A 595 mL sample of chlorine gas at 24.7°C is held at constant pressure while it is heated and the volume of the gas expands to 876mL. What is the new temperature in Kelvin? A) 83.7 K B) 202 K C) 365 K D) 438 K A sealed beaker contains liquid Bromide, which has a brown color. We heat the beaker and after a while, the top of the beaker becomes brown. Then, the whole beaker becomes brown, until it stops. Why does the beaker become brown? How many grams of water would be produced by the decompostion of 1.07 grams of H2O2? How to do 161st question? In #ddotCX_2#,both the electron get paired up in #sp^2# hybrid orbital.Thus,#ddotCX_2# exists in the form of singlet state.Why?{here #X# refers to halogen} How to use MgSO4,Na2CO3,HCL to prepare magnesium chloride salt ? What decides the color of a compound ? I want a brief explanation. How many milliliters of a 1.20 M NaBr solution contain 86.5 g of NaBr? 1.11 g of ca cl2 added to water forming 500ml solution. 20ml of this solution is diluted 10 folds. find the moles of cl- in 2ml diluted Solution? Baking soda decomposes on heating as follows, creating the holes in baked bread: Calculate the standard molar enthalpy of formation of NaHCO3(s) from the enthalpy of the baking soda decomposition reaction and the following information:? Although the noble gas elements are monatomic and could not give rise to dipole-dipole forces or hydrogen bonding, these elements still can be liquefied and solidified. Could you explain this? Do compounds have a variable compostion? How's explain the methil orange ? Which category would polar molecules fall under: Arrhenius Acid/Base Bronsted-Lowry Acid/Base Lewis Acid/Base? Which compound will form by the combination of oxygen and neon ? Also say the type of bond. In the electrolysis of water...? The minimum energy needed to dissociate iodine molecules, I2, is 151 kJ/mol. What is the wavelength of photons (in nm) that supplies this energy, assuming each bond dissociated by absorbing one photon? A diamond contains 5.0 multiply by 10 to the power 21 atoms of carbon .How many moles of carbon and how many grams of carbon are in this diamond? How many liters of 0.150 M HCl would be required to react completely with 25.00 grams of calcium hydroxide? What is the weight in grams of silver displaced by 0.1 mole of magnesium? The ratio of carbon to hydrogen in a hydrocarbon is 1:2. If 7.0g of the hydrocarbon occupies 2.24L at s.t.p, what is its formula? Find the mass of carbon dioxide contained in 0.85-m^3 tank at 2068.44 kpaa, 37.8°C? Calculate the energy of the 1st line of the Hydrogen spectrum.Its wavelength is 410nm? What are the valencies of chalcogens?(Group 16) 1:1 and 4 2:2 and 1 3:2 and 5 4:2 and 6 5:1 and 5 Does number of protons always equal to number of electrons? Using equations determine what the exact opposite of fire would be HINT: (it’s not water or ice)? At a particular temperature 8.0 mol NO2 gas is placed in a 1.0-L container. Over time the NO2 decomposes to NO and O2: 2NO2(g) 2NO(g) + O2(g) At equilibrium the concentration of NO(g) was found to be 3.8 mol/L. What is the the value of K? What is the mass (in grams) of copper in 9kg one? Is a solution of a weak acid considered a buffer solution? If #"K"_"sp"# of #"Mg(OH)"_2# is more than that of #"MgCO"_3# which gets precipitated first? Which of the elements has a single electron in its outermost subshell? 1)Ca 2)C 3)P 4)Ge 5)Cu Doubts in stoichiometry/mole concept? What is electron protron neutron in Na? In which species does phosphorous have an oxidation number of zero? In which species does phosphorous have an oxidation number of zero? P4 (elemental phosphorous) HPO2 Li3PO3 H3PO4 PH3 What is the molar concentration of carbon dioxide in equilibrium with calcium carbonate at 519 K if #K_text(p) = 2# for the reaction #"CaCO"_3"(s)" "CaO(s)" + "CO"_2"(g)"#? Balance the half equation for this reaction to work out how many moles of electrons are needed to reduce one mole of nitrobenzene C6H5NO2+..........e- + ..........H+ = C6H5NH2+ .......H20? How does distillation separate mixtures? What is the concentration when equilibrium is reached? Hi, could someone tell me the beta decay of Indium 115? The only one I see is Sn, but that wouldn't balance out with the 115? Calculate the volume of H2 that will be produced from the complete consumption of 10.8 g Zn in excess 0.100 M HCl (P = 724 torr, T = 20.5 °C).? A. 8.35 L B.1.65×10-2 L C.4.18 L D.0.292 L E.5.49×10-3 L 2Na+2H2O=2NaOH+H2 In SATP,what is the Volume of H2 if 5g of Na reacts? A sample of household ammonia has a pH of 11.50. What is the hydronium ion concentration of this solution? A sample of NaOH has a pOH of 0. What is the hydroxide ion concentration of this solution? Do molecules in the solid state arrange themselves into a crystal lattice? What is the equilibrium concentration of water in the reaction #"CO" + "H"_2 "CO"_2 + "H"_2"O"# if the initial concentrations of carbon monoxide and hydrogen are each 0.125 mol/L? Calculate the mass of lead (ii) chloride precipitate produced when 2.27g of sodium chloride in solution reacts in a double displacement reaction with excess aqueous lead (ll) nitrate? Which statement is true regarding redox reaction? How many liters of nitrogen gas are needed to react with 90.0 g of potassium at STP in order to produce potassium nitride according to the following reaction? 6 K + N 2 ---> 2 K 3 N Why is ammonium chloride used in group III analysis for basic radical ? can we add ammonium hydroxide first. How do I calculate the maximum number of molecules of H2O produced when 11.5g of C4H6 (54.1g/mol) reacts with 41.8 L of O2 (32g/mol) in the following balanced equation: 2 C4H6 + 11 O2 --> 8 CO2 + 6 H2O ? What is the molality of pure water? a)55.5 b)3 c)1 d)4.5 Solute seperates as a solid when a saturated solution is cooled. Why ? What alkane of molecular C8H18 gives a single product of monohalogenation when heated with Cl2? Write the IUPAC name for the product of monohalogenation? Explain oxygen is paramagnetic while c2 is diamagnetic? #CrO_4^(2-)# is added to a solution where the original concentration of #Sr^(2+)# is #1.0 * 10^-3#. Assuming the concentration of #Sr^(2+)# stays constant, will a precipitate of #SrCrO_4# (Ksp = #3.6 * 10^-5#) form when #[CrO_4^(2-)]# = #3.0 * 10^-5# M? Calculate the pH of the following solution pH = 2 #HCN# & pH = 12 #NaOH# (#K_a = 10^(-10)#)? How do you convert g/ml to g/cm3? Calculate total pressure of a mixture that contains 1 gram of hydrogen and 1 gram of helium in 5 litre at 21°C ? Can anyone solve my this chemistry work? The concentration of sugar in a soft drink is measured to be 10.5%. How many grams of sugar are in 125 g of the drink? Chlorine has two isotopes. Chlorine-35 has an actual mass of 34.9689 u and chlorine-37 has a mass of 36.9659 u. In any sample of chlorine atoms, 75.771% will be chlorine-35 and 24.229% will be chlorine 37. What is the average atomic mass of chlorine? Why Ph.Ph indicator is not used instead of methyl red indicator in the standardization of HCl solution by borax? Concentrated sulphuric acid should not be used while preparing hydrogen gas in laboratory. Why ? Determine whether Entropy increases or decreases if the following are changed: Temperature, Phase and Number of Particles? Given Le Chatelier's principle that says equilibrium will shift to maintain the ratio between products and reactants, how is a buffer physically possible? What is the volume occupied by 11.0 g of propane gas, C3H8, at STP? Question 35 options: 89.6 L 0.250 L 21.6 L 5.59 L 4.00 L Calculate the bond dissociation energy in the following equation, given the information below? CH4(g) + 2O2(g) --> CO2(g) + 2H20(g) For reference: DHf° C-H = 87 Kcal/mol DHf° O=O = 118 Kcal/mol DHf° C=O = 178 Kcal/mol DHf° O-H = 111 Kcal/mol An atom o element X has a mass 3.155*10^_23 g. What is the atomic mass of the scale 12C =12 U? Write the symbol for X 6 Hypochlorous acid, HOCl, reacts with water as shown below: HOCl(aq) + H2O(l) <---> OCl-(aq) + H3O+(aq) What is the pH of a 0.033 M aqeous solution of acetic acid? Ka=1.1e-2 How many atoms of mercury are there in exactly 1 g of the metal? What mass of anhydrous solute is needed to prepare 450 mL of 0.019 M NaF(aq)? How do atoms of nitrogen-14 and nitrogen-15 differ from each other in terms of their atomic numbers, mass numbers and atomic structure? Calculate the mass of silver nitrate needed to prepare a solution of 0.02 mol/L? How many molecules of oxygen #"O"_2# are there in #"2.00 g of O"_2"#? If the #"O"_2# molecules were split into atoms, how many moles of oxygen atoms would be obtained? Please help me What volume of 1.5 M HCl solution do you need to use to make 500 mL of 0.25 M HCl solution by dilution? When a piece of paper burns, smoke and ash are produced whats the reaction? What mass of anhydrous solute is needed to prepare 0.53 L of 0.146 M K2SO4(aq)? Liquid pentanol (C5H12O) and gaseous oxygen Express your answer as a chemical equation. Identify all of the phases in your answer. Enter NOREACTION if no reaction occurs? An "empty" container is not really empty if it contains air. How may moles of nitrogen are in an "empty" two-liter cola bottle at atmospheric pressure and room temperature (25C)? Assume ideal behavior. What is the molarity of 156 mL of solution made from 2.5 grams of KCl? How is the activity series of metals used to determine whether or not a single replacement reaction will occur? What values exactly associated with orbitals px, py, pz, dxy, dyz, dzx, dx^2-y^2,dz^2.? Pl be specific whether px is +1 0 or -1 Use Newton's Law of Cooling, #T = C + (T_0 - C)e^(kt)#, to solve the problem. Thanks?! Why is methane a stable compound? Why rate of reaction decreases by passage of time? For the reaction A <--> B, if the equilibrium constant is Keq = 11.7, and 4.0g of A (FW = 100g/mole) are initially placed into 5.0 L of solution. ? If the gas is determined to "bark" in a lab test for gas using a lit wooden splint to the mouth of a test tube sample of the gas, what is the identity of the gas? Yo what volume should 5.0g of KCl be diluted in order to prepare a 0.25 M solution? A well-known aphorism in chemistry is that for every 10° increase in temperature, the rate of a reaction will increase twofold. If the reaction were performed at 45° C predict whether it would occur at twice the rate of the reaction performed at 35° C ? The scenario: The time is well into a zombie apocalypse, the internet is no longer a thing, and all the vitamin shops have been scavenged. How can one obtain Potassium Iodide? Is it possible to extract it from plants? Fresh cranberry contains 88% of water and dried 5% of water. How much is the mass of fresh cranberries from which can we get 5 kg of dried cranberries? What must be done to an atom before it can emit light? What is the normality of the following solution? Which gas turns lime to water milky? (Oxygen/Carbon dioxide) How does a hydrogen atom in water form four hydrogen bonds? Calculate the pH of a 0.075M solution of perchloric acid (HClO4) at standard conditions? How does temperature change the phases of matter? Which of the following is not equivalent to the remaining three? How This two reducing agent act (LiAlH4 and NaBH4 ) on breaking different type of bond like (c=c,c=o e.t.c) in different compound? To what calsius temperature must 580 ml of oxygen at 17°C be raised to increase its volume 700 mL? A sample of iron has the same dimensions of 2 cm × 3 cm × 2 cm.if the mass of this rectangular-shaped object is 94 grams,what is the density of iron? The total number of electrons in orbitals with ml = 0 for Sr? a) 2 b) 10 c) 12 d) 18 e) 34 Calculate the concentration (mol/L) of 25.5 mL of 7.07 mol/L HCl diluted to 0.500 L with water? 100 liters of water for softening needed 15.9 grams of #Na_2CO_3#. What was the hardness of water? A sample of gas occupies 55ml at 182 degree centigrade at 3 atm pressure.what will be the volume of the sample at STP? Why is it important that we know the initial concentration of NaOH very accurately and yet for crystal violet, we do not need to know its initial concentration? (We aren't using volumetric glassware when we add 3 drops of crystal violet) What is the emperical formula for a compound given that the relative mass of the compoubd is 90g/mol? Rank the following 1.0M solutions from highest conductivity to lowest? Why there are some expectations for writing electronic configuration for copper and chromium ? How to do 124th question? Hydrogen gas reacts with oxygen gas to produce water. Write out the balanced chemical equation. How many grams of water can be produced from 10 moles of hydrogen gas (assume an excess of oxygen)? What is the effect of #"CO"_2# on pH? A solution of 0.64g of adrenaline in 36g of carbon tetrachloride causes an elevation of 49°C in the boiling point. What is the molar mass of adrenaline? Show the solution. A buffer solution contains 2.18M hypochlorous acid and 0.54M hypochlorite ion. What is the pH of the buffer? The Ka of hypochlorous acid is 4.0 x 10^-8. If 1 oxygen atom fuses with 2 hydrogen atoms (not bonding!), would they create neon? Is this how neon is made inside stars? What is the electron configuration of Gallium in its excited state? What is the difference between electronic and molecular geometries? What are two ways you can achieve lower density in a gas? Explain Why Whats the empirical formula of C10H22? What is a nuclide? A 5 gram piece of aluminum foil at 100 degrees C is dropped into a 25 gram container of water at 20 degrees C. What is the final temperature of the aluminum? Chemistry Problem? Please answer soon How can I write the Lewis formula for this please? Thanks! A mixture of ethene and propene requires 3 mol of oxygen for complete oxidation and 20.16 L of hydrogen for complete reduction. What is the mass of the original mixture? In determination of percent purity of sodium carbonate a 25cm³ aliquot of a 5.4g/l sample required 17.57cm³ of 0.07495m soln of dilute hcl acid to reach methyl orange end point. calculate the percentage purity of the sodium carbonate sample? How do you calculate the acetone and cyclohexane in the vapor above the solution. P°acetone = 229.5 torr and P°cyclohexane = 97.6 torr? The names of three chemicals are given below Sodiam hydroxide ,chlorine ,and liquified ammonia 1) mention when danger in each case that you would associated whith a)sodiam hydroxide b)chlorine? Thanks Fe + S --> FeS If we have .14 Mol of Fe and .27 Mol of S. Which is the limiting reactant? How many moles of FeS would be produced if the limiting reactant was used up? Calculate the energy of an electron in the hydrogen atom when n=2, then calculate the frequency required to ionize it? How many liters of each solution do you need to get 3.0 mol of HCl? If we start with 60 atoms of uranium-238 how many would remain after 4,470,000,000 years? A teacher dilutes 12.0 M HCl down to 2.76 M for a lab. A total of 400.0 ml are needed. How much concentrated acid will be used? If 0.30mol of Zn is added to hydrochloride acid containing 0.52 mol of HCl, how many moles of H2 are produced? ( what is the theoretical yield of H2 produced in the reaction? A (6.12x10^1) .00 g sample of strontium reacts with an excess of nitrogen to form strontium nitride. What mass of strontium nitride forms? What is the final mass of lead electorde? How long does it take a radioactive element to decay to #10%# of its original quantity in a first-order process if its half-life is #"43.80 s"#? Do elements have a variable compostion? What are the products from the Reaction of water and sulphuric acid? If a 0.489 M solution of L-ascorbic acid is being prepared what mass of solid (in grams) must be added to make a 500 ml of solution? What are 3 ways that an atom can achieve a noble-gas configuration? What is the blank?Elements are _____________ that cannot be broken down into other substances. What substance is reduced in the following redox reaction? 18g glucose is dissolved in 180g of water. The relative lowering of vapour pressure is ? a)1 b)1.8 c)0.01 d)0.001 How many molecules are in 2.570 moles of H2? What is solubility product? And what is ionic product? In III A group element oxide is #25.53#% oxygen. What is the element? Does 5SO32- have 8 oxygens or 15? Im majorly overthinking... How do I balance long redox equations? In the Lewis structure of SO3. What is the formal charge of atom O? How to prepare 500cm3 of 2moldm-3 HCl solution by using 1.12gcm-3 HCl solution with 36.5% w/w percentage? Relationship between pH & pOH ? Supports combustion is it physical or chemical property? Calculate the pH value of a solution, in which the [OH] is 1.0x10^5M? 15 moles of h2 and 5.2 moles of I2 are mixed and then allowed to attain equilibrium at 500°C. At equilibrium, the concentration of HI IS 10 MOLES. The equilibrium constant for the formation of HI is? Calculate the molarity of a solution prepared by dissolving 5.850g of solid NaCl in enough water to make 200mL of the solution? Let #phi_n# be the properly-normalized nth energy eigenfunction of the harmonic oscillator, and let #psi = hatahata^(†)phi_n#. What is #psi# equal to ? If #DeltaH_c^@# of solid benzoic acid at 27°C is -x kcal/mol, then #DeltaE_c^@# (in kcal/mol) is? What charge does the barium ion possess in the compound BaCl2? A sample of NaOH has a pOH of 0. What is the hydroxide ion concentration of this solution? So long as the conical flask is clean why does it not matter if it is wet prior to addition of the -ascorbic acid solution? 1. it does matter, it is essential to the experiment that all equipment is clean and dry before use 2. because water does not t What condition of temperature and pressure do real gases tends to show ideal gas ? When a sample of a gas is kept at constant pressure the volume and Kelvin temperature of the gas are? Why are elements and compounds called pure substances? What is the negatively charged atomic particle of an atom called? The red light of a He-Ne laser has a wavelength of about 633nm. What is its frequency? Are solutions pure substances? Distinguish between sigma and pi bond? Heat of fusion of ice is 6 kilo joule per mole , hence the entropy change for fusion of 10 g ice at 1 ATM is......? The HCI acid solution has a molarity of 6. What does that mean? What is the molality of 3.5% (w/w) aqueous solution of glucose? a)0.2m b)2m c)1.5m d)3.5m What are electrolytes ? What is the mass of #4.72 * 10^23# molecules of #Cr_3I#? Using the diagram below: Write the oxidation half reaction? The number of moles and the mass of oxygen formed by the decomposition of 1.252 g of mercury(II) oxide? A reaction has a standard free-energy change of -15.50 kJ mol^-1 (-3.705 kcal mol^-1). how is the equilibrium constant calculated when the reaction is at 25 degrees celsius? How many protons, electrons, and neutrons does the following isotope contain? 1 H + How does the reactivity of the element described in (a) compare with the reactivity of the element with the electron configuration [He]2s1 ? A sample of household ammonia has a a hydrogen ion concentration of 3.16e-12 M. What is the pH of this solution? What is the molarity of a salt solution (NaCl) that has 4.0 mol per 8.0 L? A sample of lime (CaOH2)has a pH of 12.4. What is the pOH of this solution? What element is in period 4 and has 4 number shells and 3 valence electrons? Why can't sucrose solution conduct electricity? How did James Chadwick contribute to the periodic table of elements? If 55.0g of ethane is mixed with 55.0g of oxygen and the mixture then reacts, how many grams of water will be formed? What is Molecular formula of co2 when c is 12 o is 16? What is a Carbon Sink ? If 4.36 moles of C5H12 reacts with excess O2, how many moles of CO2 will be produced in the following combustion reaction? Why do electrons go from a higher energy state to a lower energy state when a chemical bond is formed? The compound insoluble in acetic acid is? What happens to each HCI molecule when it is dissolved in water? 6.3 gm of conc nitric acid is diluted by adding 68 gm of pure water. How many oxygen molecules are present in the solution? What is the molarity of a solution made by dissolving 67.3 g of lithium chloride in enough water to make 2.37 l of solution? In the Cr3+ion, how many electrons have ms=+1/2? Write the complete electron configurations of; 1:Mn 2:Mn2+(in aqueous solution).Comment ideas about stability of that cation in aqueous solution giving reasons.? In the Cr3+ ion,how many electrons have n+1=4 and ms=-1/2? The energy need to liquify 10g of ice is 3.6kJ.If the radiation with frequency 4.53×10^14 Hz is used to liquify 5g of ice,the number of energy photons need for this is,? 1: 12×10^21 2: 6×10^21 3: 24×10^21 4: 18×10^24 5: 12×10^20 How to compare metal to water ? Give solubility order for:- (i)alkali metal per chlorates (ii)alkali metal bicarbonates (iii)lead (II) halides (iv)mercury (II) halides? Determine the pH of each of the following solutions. Part A:0.14 M NaC2H3O2 Part B: 0.12 M NaCl How would I solve for the pH? Do I use an ICE table? How would you determine is the following salts will from a solution that is acidic, basic, or pH neutral? CH3NH3CN, Fe(ClO4)3, K2CO3, CH3NH3CL, RbI Calculate the amount of energy in calories required to heat 180 g of water from 22.3C to 75.0C.? Answer in units of cal. If 25 ml of 0.667 M solution is diluted to a final volume of 100 ml what is the concentration of the final solution? Why do we not use the amount of excess reagent to predict the amount of product formed in a reaction? If the Ka of ascorbic acid is 7.94 x 10-5 what is the pKa? 1. -4.10 2. 6.10 3. 4.10 4. 4.75 If the concentration of a sample was found to be 0.010 mol dm-3 how many moles are there in 150 ml? 1. 1.5 mol 2. 0.15 mol 3. 15 mol 4. 0.0015 mol 5. 0.015 mol What is Ka at 25 °C for the following equilibrium? CH3NH3+(aq) + H2O(l) CH3NH2(aq) + H3O+(aq) Kb (CH3NH2) = 4.4 × 10–4 at 25 °C. a. 4.4 × 10–4 b. 2.3 × 103 c. 4.4 × 10–10 d. 4.4 × 104 e. 2.3 × 10–11 What's the pH of 0.75M barium hydroxid? #Ba(OH)^2# How do you calculate specific heat without the final temp to calculate ΔT? Why weight of 5 ml vinegar is almost equal to its volume? 1.a compound was found to contain 43.66% phosphorus and the rest was oxygen.find the simpliest formular of the compound? How many moles of sodium hydroxide are present in 50.00 mL of 0.09899 M NaOH solution? Find (a) the mols required to break the buffer (i.e. when #Delta"pH" = 1.00#), and (b) change in pH due to adding #"0.005 mols OH"^(-)# in a #"1-L"# acetic acid buffer containing #"0.010 M"# of each component? Then find the buffer capacity in (b). What is the mass of nickel in kg,that would give 9.2×10^25atoms of nickel(use mole concept)? What are [H+],[OH-],pH, and pOH of 0.120 M of CA(OH)2? If you add 25 ml. of 2.25 M NaOH to 500 ml. deionized water, what is the molarity of this solution? Find pH of the solution that results from the addition of 26.00 ml of 0.200M NaOH to 50.0 ml of 0.100M HCL? How do you solve this chemistry question? Consider the following reaction at 298 K. Le Chatelier's Principle At room temperature, is the value of K really large, really small, or moderate? How does the value of K change with temperature? What evidence supports this answer? Choose the correct Kc expression when the equation for the Kc expression shown below is halved and reversed. ? A. 1/2 Kc B. 1/ (Kc)1/2 C. Kc 2 D. Kc * 2 E. 1/ Kc 2 What is the enthalpy change for the reaction? #2S_(s)# + #3O_2(g)# #rarr# #2SO_3(g)# #2SO_3(g)# #rarr# #2SO_2(g)# + #O_2(g)# ; #DeltaH# = 198 kJ At moderately high temperatures, SbCl5 decomposes into SbCl3 and Cl2 as follows: SbCl5(g) <---> SbCl3(g) + Cl2(g) ? Cu + 2AgNO3 --> 2Ag + Cu(NO3)2 If a 20g sample of Copper (Cu) is used, what is the theoretical yield of silver? A 2.500-mol sample of PCl5 dissociates at 160oC and 1.00 atm to give 0.338 mol of phosphorus trichloride, PCl3, at equilibrium. PCl5(g) <---> PCl3 + Cl2(g) ? What is the difference between A saturated and supersaturated solution? How does supersaturated work when cooled, what evidence shows it’s supersaturated? What is the balanced equation (in words and symbols) for the reaction between sodium bicarbonate and acetic acid? How much 0.5 M HCl can be made by diluting 250 mL of a 10 M HCl? What is the concentration of 450.0 mL of solution that contains 225 grams of iron (I)chloride (FeCl, molar mass=91.3)? How would you draw a Lewis structure for N3? How many grams of sodium chloride (NaCl) are needed to make 200.0 mL of a 2.5 M solution? Examples of chemical and physical properties? Which state of matter is water in the air? A) gas C)liquid B) solid D) none of the above There are 135 L of gas in a container at a temperature of 260°C. If the gas was cooled until the volume decreased to 75 L, what would the temperature of the gas be in degree celsius? Will the addition of sodium acetate to an acetic acid solution change the pH of the solution? explain your answer. What is the empirical formula for H2O ? Rearranged and Combined Equation:? Br(g)+O3(g) ------> BrO(g)+O2(g) Br(g)+2O2(g)-----> BrO (g)+O3(g) The solubility products of #Fe(OH)_2# and #Fe(OH)_3# are #10^(-17)# and #10^(-38)# respectively. If the concentrations of #Fe^(2+)# and #Fe^(3+)# are each #10^(-5)#, what is the #[OH^-]# when each just begin to precipitate? Chemistry question about solubility products and #K_(sp)#? The number of moles of sodium nitrate, NaNO3, required to produce .056m mole of oxygen. (NaNO2 isthe other product.)? Why is CH4 tetrahedral while NF3 is pyramidal? Using the following unbalanced equation, answer the following questions? #"NH"_4"NO"_3(s) stackrel(Delta" ")(->) "N"_2"O"(g) + "H"_2"O" (g)# How many moles of CO2 was added? How is second equivalence point calculated? How many grams of calcium carbide are produced when 4.0 moles of carbon react with an excess of calcium carbonate (CaCO3)? The value of Kp for the following reaction at 627oC is 6.55. SO2(g) + 1/2O2(g) <---> SO3(g) What is Kc at this temperature? Why borax solution should be prepared quantitatively in a volumetric flask and using a sensitive balance? Name two gases which chemically compine to from A)solid B)liquid ? How many grams of CoSO4 are present in (5.52x10^-1) L of a (2.7600x10^0) M CoSO4 solution? Using the following unbalanced equation, answer the following questions? #"CaCO"_3(s) + "C"("gr") stackrel(Delta" ")(->) "CaC"_2(s) + "CO"_2(g)# How many atoms of calcium are in 1.00 gram? How many atoms of iron are in 1.00 gram? How many atoms of carbon are in 1.00 gram? If you dilute 250mL of a 12.0M solution of HNO3 to a final volume of .500L what will be the concentration of the diluted solution? The combustion reaction of C3H8O is represented by this balanced chemical equation: 2C3H8O + 9O2= 6CO2 + 8H2O. when 6.01×10^22 molecules of O2 and 2.78×12^23 molecules of C3H8O are combined, how many grams of which reagent was used? Using the equation below: C(s) + 1/2 O2(g) --> CO(g) + 26. 4 kj Using the terms low and high, this equation is what in terms of entropy and enthalpy? A solution is prepared by dissolving 854mg of lithium nitride in 600mL of water at 25 degrees C. The density of water at this temperature is 0.997g/mL. For this solution calculate the concentration % (m/m)? How many liters of water are needed to make a 4.00mL solution using 100. grams of Lithium Bromide? Why is phenolphthalein not that much appropriate to identify a given solution is acid, base or salt? What is the pressure, in Pa, if #3 mol# of gas occupies #500cm^3# at #25^oC#? The root mean square velocity of hydrogen molecules is 183,000cm/sec, what is its density at atmospheric pressure? A dried sample of K2Cr2O7 weighing 0.9500 g was dissolved in 1580.0 mL of 1.0 M H2SO4. What is the concentration of Cr (51.9962g/mol) in ppm? What volume of hydrogen will be liberated at NTP by the reaction of Zn on 50 ml dilute H2SO4 of specific gravity 1.3 and having purity 40%??? To resolve an object in an electron microscope, the wavelength of the electrons must be close to the diameter of the object. What kinetic energy must the electrons have in order to resolve a protein molecule that is 7.40 nm in diameter? Write Balanced molecular(not ionic) equations for each of the following? A. HNO_3 + KC_2H_3O_2 900g of NaOH dissolved in 100g of water at 25 degree c and 1 atm what is final temp? When 0.076 moles of iron(III) chloride are dis- solved in enough water to make 690 milliliters of solution, what is the molar concentration of chloride ions? When water is electrolyzed, hydrogen and oxygen are produced in the ratio 2:1. Why? The state of hybridization of the central atom and its number of lone pairs over the central atom in #POCl_3# are, A. #sp,0# B. #sp^2,0# C. #sp^3,0# D. #dsp^2,1# ? Why the energy difference between first and second orbit of hydrogen is less as compared to these orbits of uranium atom? A compound has 54.5% carbon, 9.1% hydrogen and 36.4% oxygen. It has a molecular mass of 88. Find it's molecular formula? By writing molecular orbital configuration for NO,CO,O2 molecules calculate the bond order and also determine whether it is paramagnetic or diamagnetic? Why you have to do a titration at least twice or more? What is the change in Gibbs' free energy for #"C"(s) + "O"_2(g) -> "CO"_2(g) + "393.51 kJ/mol"#? How many particles are contained in 0.45 mol of any element? A cylinder of oxygen gas contains 91.3g of O2 .IF the volume of the cylinder is 8.58L what is the pressure of the o2 if the gas temperature is 21°C? How to find the mol contained in a sample of 5.84 x 10^23 atoms of a specific element? How can I balance this redox reaction? What volume of 0.125 M KMnO4 is required to yield 0.180 mol Of potassium permanganate KMnO4? How do I do this limiting reactants problem about magnesium oxide? How do I do this limiting reactants problem about barium sulfate? A) 9.80g of water vapor condenses on a soda can at 100.0°C? Given : latent heat of vaporization 2260 J/g latent heat of fusion 334 J/g (i) State the phase change for the above process (ii) Calculate the amount of energy transfer Is the atomic number of a alpha particle 2? Really need help with Science!!! Please? A balloon that can hold 85 L of air is inflated with 3.5 moles of gas at a pressure of 1.0 atmosphere. What is the temperature in 0C of the balloon? How many formula units of cobalt(II) phosphate can be produced by the reaction of 408 formula units of cobalt (II) chloride? Relationship between free energy, enthalpy, entropy? Which step would be the rate-determining step? How many moles of AlS will you make if you have 4.3 x 10¹ moles of LiS in the following equation? At 500(degreeC), the decomposition of water into hydrogen and oxygen,2H2O(g) <-->2H2(g) +O2(g) has Kc=6e-28. How many moles of H2 and O2 are present at equilibrium in a 5L reaction vessel at that temperature if the container originally held 0.015 mol H2O? How many grams of salicylic acid contains 64.2 moles of carbon? Arrange the following in order of increasing ionic radius? 1.Ca2+,P3+,Cl-. What the oxidation number of the sufur atom in K2SO4? A helium neon laser emits red light having a wavelength of 632.8 nm. calculate the frequency of light emitted by the HeNe laser. use speed of light c=2.998 x 10^8 m s-1? Which compound should have the largest lattice energy? SrI2. CaCl2. NaI. MgO. KF. You have 2.0 x 10²² moles of HCl in the equation below. How many moles of CaCl will you make? A completed reaction yields 38 moles of Ag from the equation below. How much Cu did the equation start with? The metals reacting with bases are known as?? Explain briefly how would you obtain chlorine starting from sodiam chloride (not by electrolysis) ? What is the empirical formula of this substance which consists of 20.2% C, 11.4% N, 65.9% O, and 2.50% H by mass? Commercially prepared HCL is 38% by mass . Density is 1.19g cm^-3.calculate the morality of HCl solution and morality and mole fraction of HCL in the solution . Given (at wt. Of Cl = 35.5,H =1)? You are given a mixture of acid ,base. and neutral substance describe what you would do to obtain all substance separately?? What is the concentration of OH- ions in the final solution prepared by mixing 20ml of 0.05 M HCL with 30ml of 0.10M Ba(OH)2? Calculate the temperature difference if 180kg of steel grains 85113kj of heat.(the specific heat of steel is .49 kj/kgk)............follow the eqation (Q=MCp T2-T1 )....? Which of the following has/have a strong covalent bond? (A) Cl-F (B)F-F (C)C-Cl. (D)C-F? What do we call for mixture of metal and non metal? What is the reaction in chemical balancing process? Chlorine gas can be prepared in the laboratory by the reaction of hydrochloric acid with manganese(IV) oxide: 4HCl(aq)+MnO2(s) ---> MnCl2(aq)+2H2O(l)+Cl2(g) ? An explanation of why an ionic bond is solid at room temperature? What happens when Copper Sulphate reacts with KI and KCl each? How many moles of aluminum sulfide in 155 gram of aluminum? Hello, Can someone please help me solve this problem? a sample of gas has a mass of 0.560 g. Its volume is 123 mL at a temperature of 95 C and a pressure of 761 mmHg. When the atmospheric pressure is 6 times it’s average, how would you calculate the boiling and melting point of a molecule? 10g of NaCl are dissolved in 0.50L of water, what is the molarity of this solution? Hello, Can someone please help me solve this problem? An experiment shows that a 114 mL gas sample has a mass of 0.161 g at a pressure of 713 mmHg and a temperature of 26 C. *WHAT IS THE MOLAR MASS OF THE GAS?* Identify the cathode and anode, write the net cell equation, and calculate the cell potential for #"Pt"(s) | "SO"_4^(2-)(aq), "H"^(+)(aq) | "H"_2"SO"_3(aq) "||" "Ag"^(+)(aq) | "Ag"(s)#? What volume of oxygen gas, at 30.0ºC and 1.50 atm, is produced when 75.0g of water is electrolyzed? 2H2O --> 2H2 + O2 Why do we need Avogadro's law? What is the commercial name of the mixture of #text{Na}_2text{O}_2 + text{HCl}#? How many moles of oxygen react with 6 moles of octane? How can you separate a mixture of shampoo and sand? A weather balloon is filled with 1.0 L of helium at 23 °C and 1.0 atm. What volume does the balloon have when it has risen to a point in the atmosphere where the pressure is 220 torr and the temperature is -31 °C? When Bromine and Aluminum react, what chemical formula would you expect to find? How do you write the formula? What volume of .15M NaOH could be produced with only 5 grams of NaOH and water? What is the number of liters in 1.56 moles of Xenon gas? How many number of moles of ammonia can be formed from #"0.25 moles of N"_2# gas? What is the molarity of 36 g CuSO4 in 500 mL solution? What is the molarity of 2.0 g NaCl in .5 L solution? How many milliliters of 0.75 M solution can be made using 75 grams of sodium hydroxide (NaOH)? 8.0 L of gas in a piston at a pressure of 5.0 atm are compressed until the volume is 8.5 L. What is the new pressure inside the piston? What is the molarity of 2.4 moles KBr in 4 L solution? Given 750 mL of a 2.5 M NaOH solution, how many moles of sodium hydroxide are there? Given 1.5 L of a 3 M HCl solution, how many moles of acid are there? What is the molarity of 1.2 x 10^24 molecules CaCl2 in 2.5 L solution? If you need to make 2 L of a 2 M solution of NaOH, how many grams of NaOH would you need to make the solution? The metal which can displace hydrogen from hydro chloric acid is? What would the mass be if you had to moles of magnesium? 2 AgNO3 + BaCl2 - > 2AgCl + Ba(NO3) 2 How many grams of silver chloride are produced from 5.0g of sliver nitrate reacting with an excess of barium chloride? How much barium chloride is necessary to react with the silver nitrate in last question? What is the solubility of the benzoic acid in water at 18°C? What is the solubility of benzoic acid in water at 75°C? Provide references? How many moles of carbon dioxide are exhaled? What are the similarities exist between the fossil fuel molecules and the food molecules? What is the partial pressure? What is the chemical equation for NH4OH dissolution in water? What is the oxidation number of nitrogen in NO2? What you would observe if copper(ii) carbonate, #CuCO_3#(s), and sulfuric acid, #H_2SO_4#(aq) were mixed? How does specific heat of a heated object affect temperature change when placed in water? What is the frequency and wavelength of a photon emitted during a transition from n = 6 to n = 1 state in the hydrogen atom ? How many protons are present in 10 gm of calcium carbonate? Which species has the highest ionization energy? Mg, Mg+, Mg2+, Al+, Al2+ What is the density of O2 gas at 4.0 atm and 100 Celsius? What is balanced equation for SiCl4+H2O--->SiO2+HCl? If absolute temperature of a gas is doubled and the pressure of the gas is halved, how will the volume change? N an acid-base neutralization reaction 38.74 mL of 0.500 M potassium hydroxide reacts with 50.00 mL of sulfuric acid solution. What is the concentration of the H2SO4 solution? How many grams of AgNO3 are needed to prepare a 0.25 m solution in 500 grams of water? 125 g 0.125g 21.25 g 170g What is the ionic compound name for nh4cl? If electrode potential of 0.01M Cu^2+/Cu is 0.32V then what will be its E°_RP? What is the value of Kp at 298K for the reaction 1/2 CH4(g)+H2O(g)<=>1/2 CO2(g)+ 2H2(g) ? Beryllium only is first than sodium then how it is considered that Na has the highest atomic radius ????? What is formed on complete combustion of carbon? Why copper utensils kept expose to air turn green ? What is the chemical equation behind it? Please write a chemical equation for it. 10 ml of 5gm sugar solution in mixed with 20ml of 10% of sugar solution. find the concentration of the solution? How do non metals react with acids? Calculate the wavelength of light emitted when the electron in the hydrogen atom undergoes a transition from level n4 to n3? What mass of NaCl is required to prepare 308.0 mL of 0.250 M solution? Use a molar mass with at least as many significant figures as the data given. Show the formation of HNO3 by the transfer of electrons? Will there be any pi bond in C2H6 molecule? How do you balance the equation for the production of water from elemental hydrogen (H,) and oxygen (O,).? Iron reacts with dilute sulfaric acid according to equation, Fe+H2SO4---> FeSO4+H2, What mass of iron will react with 75cm3 of 0.5 M H2SO4? Convert 18 km/h to m/s? Answers with steps If a sample of LiF is found to contain 7.73 x 10^24 Li+ ions how many grams of LiF formula units are present? Why neutralization of acetic acid does not occur with sodium hydroxide in presence of hydrochloric acid? What is the Intermolecular force of nh3? Thank you Oxidation staze of banzealdihyde? If you have 40 grams of H2, how much NH3 can you make? What is the acid, base, conjugate acid, and conjugate base? If you have 50 grams of N2 how much NH3 can you make? Which one of these compounds would require the most energy to break the intramolecular bond(s)?? Cl2 N2 F2 or O2? When the temperature of the matter increases,intermolecular forces? A)increase B)decreases C Remain same D)None Zn(s) + 2AgNO3 ---> 2Ag (s) + Zn(NO3)2 When an excess of Zn reacts with 25.00 g of AgNO3, (1.43x10^1) grams of silver are produced. What is the percent yield? If (8.2690x10^0) g of copper(II) oxide react with (2.76x10^0) g of ammonia to form solid copper, nitrogen gas, and water. What mass of copper forms? A sample of (1.86x10^1) g of hydrochloric acid reacts with manganese(IV) oxide to form chlorine gas, water, and manganese(II) chloride. What mass of manganese(II) chloride forms? It requires the removal of 1.25 kJ of energy to cool a certain sample of pure silver from 15.2 degrees C to 12.0 degrees C. Calculate the mass of the sample of silver? Write the net ionic equation for the precipitation of zinc hydroxide from aqueous solution: ? Stoichiometry - 37.8 grams of Aluminum are available for reaction with excess oxygen. Calculate the mass of the aluminum oxide that is produced? How much will be left after 105 days? You have 448 grams of a radioactive kind of actinium. How much will be left after 24 hours if its half-life is 6 hours? How do you balance this redox reaction using the HALF reaction method? Fe2+(aq) + MnO4–(aq) --> Fe3+(aq) + Mn2+(aq) How many moles are there in 23.g sodium and 46.0g ethanol? Carbon occurs in two distinct for. it can be the soft, black material found in pencils and lock lubricants , called graphite, or it can be the hard , brilliant gem we know as diamond ? Johnny needs to make a 1.8 m solution of c6 h12 o6. His teacher gave him 750ml of 1.5m c6 h12 o6. How much water must be added or taken away? How many moles of c6 h12 o6 are present in the final solution? What would you do to a question like this one? Write Net cell notation; calculate cell potential.? Convert 87.69 kJ/g into k/mol? Explain the solubility of ionic compounds and discuss the factorvaffecting solubility? What mass of NaCl is required to prepare 893.0 mL of 0.550 M solution? How do you find 0.1 mol of CaSo4 ? Describe Davission and Garmer's experiment to prove the 'wave nature of electrons'.Why? Find the geometric structure of: NaO PCl HS P. S Need an explanation,possibly with electronic configuration (Teacher requires this) ? Is there any particular method to calculate no of structural isomers either for alkane alkene or alkyne? Structures containing the mineral magnetite are found in birds' beaks and may help them navigate. Magnetite is an oxide of iron and in a 100 g sample there are 72.36 g of iron (Fe). What is the empirical formula of this sample of magnetite? 'If 24grams of water will yield 4grams of hydrogen,how many grams of hydrogen will there be in 216 grams of water? A solution of HCl acid contains 36% by mass. Calculate the molal and molar concentration of HCl solution? The density of HCl solution is 1.18g/mL. Consider there is 190 mL of solution. Make 30.0 mL of H2 gas from the reaction of 6M HCL and Aluminum. How do I do the Stoichiometry for this problem? What is density of water at 4 centigrade. ? What will be the value of #t_(0.875)/(t_(0.500))# for #n#th order reaction? Sir, How I Explain the chemical bonding of Hydrogen Fluoride (HF)? What is a balanced chemical equation for liquid bromine and aqueous sodium chloride are formed by the reaction of aqueous sodium bromide and chlorine gas? also include physical states Given 4.6 mol of the reactant O2, find the corresponding amount of NH3? A 34.0 liter container holds 305 grams of oxygen gas at 22 degrees C. How many grams of oxygen gas must be released to reduce the pressure to 1.15 ATM if the temperature remains constant? How many grams to prepare a buffer? In the topic, CHANGE IN ENTROPY why we take q(rev.) = RTlnV2/V1 ? What is the chemical equation for the reaction of Caron dioxide gas and liquid water are formed by the decomposition of aqueous carbonic acid (H2CO3)? In a chemical reaction you collect 1L Hydrogen gas at STP. How many moles of hydrogen gas did you collect? Using Boyle's Law: If 3 L of He at 2 atm pressure is compressed to a volume of 1 L, what is the new pressure? P1= V1= P2= V2= Convert formula: Solve: What is an example of a decomposition reaction? What is the most reactive element? A precipitate is a (n) .............. that form from solotion during a chemical reaction? How can an oxygen atom become an ion with a charge of -2? ___ is the measure of how much "stuff" is in an object? HA represent a strong acid; BOH represent weak base. a) in which of the following ranges is the pH of a water solution of the Salt BA * 0-7 * 7 * 7 -14 b) explain the answer? While performing the titration of a weak acid and strong base, can we put weak acid in the strong base rather than the usual strong acid in a weak base? A 20.00 mL sample of 0.1015 M nitric acid is introduced into a flask, and water is added until the volume of the solution reaches 250. mL. What is the concentration of nitric acid in the final solution? #"Fe"+"O"_2+"H"_2"O"="Fe"_2"O"_3 or "Fe(OH)"_3# Explain. What is the right answer? The thermal effect of the reaction 3cao+p2o5 =ca3(po4)2is (-739kj) Define delta hf of calcium phosphate (-4137.5kj/mole)? Stoichiometry help? Consider the reaction: C(s) + 1/2 O2(g)<----->CO(g) ? Write the equilibrium constant for this reaction in terms of the equilibrium constants, Ka and Kb, for reactions a and b below: I need help please? Complete reaction #PbO+C ->Pb+?# Some sources suggest #CO_2# while others #CO#. Do they exist in equilibrium? How to find the number of neutrons in an atom? is there any formula? If a starting compound has more free energy than the product and energy is released, this is an endergonic reaction. and WHY? A) True B) False Calculate the energy associated in joules with a Photon of wavelength of 4000 angstroms? The temperature in DEGREE CENTIGRADE of certain gas is increased by 10%. calculate % increase in volume at constant n& P? What type of reaction is tacking place between lead 2 nitrate(aq) and solution containing iodine ions ? How many grams of phosphine (PH3) can form when 11.3 g of phosphorus and 98.2 L of hydrogen gas react at STP? How can the temperature of a gas be raised without supplying any heat to it? Wat is oxidation number of carbon? How to write an equation to show ionization? How can bonding effect physical properties ? A) A certain gas occupies 2.35L at 37°C and 2.09 atm pressure. The sample of gas has a mass of 12.3g. ( R = 0.08106)? (i) Calculate the number of moles of this gas. (ii) Determine the molar mass of this gas. How many moles of gas occupy 198 L at a pressure of 3.8 atmospheres and a temperature of 23 0C ? What is the mass percent of Chlorine in the compound copper (II) chloride tetrahydrate? How to determine the n,l, and ml for cr,fe and Mg? What will be the products in the following reaction? If i have 4.00 moles of gas at a pressure of 5.6 atm and a volume of 12 liters, what is the temperature? What is the dissociation equation of Al2Cl6(s)? Explain ionic balancing with an example? What number of unpaired electrons are there in Xe atom? Where do you think the postion of hydrogen should be in the modern periodic table? A balloon is filled with hydrogen at a temperature of 22.0°C and a pressure of 812 mm Hg. If the balloon’s original volume was 1.25 liters, what will its new volume be at a higher altitude, where the pressure is only 625 mm Hg? Pressure remains the same. How many cyanide ions do you need to balance an ammonium ion? What are halides? What is disproportion reaction? Explain with an example. What is nitrogen monoxide gas reacts with oxygen gas to produce nitrogen dioxide gas? write a balanced chemical equation for this reaction Nernst Equation, what is the 2.303 value used in some case of the equation? Mathematically, where does it come from? H3po3 undergoeas disporprotion reaction but h3po4 does not? The activation energy of the reaction, A+B----> C+D+ 38kcal is 20kcal. What would be the activation energy of the reaction, C+D -----> A+B? How do I find the subatomic particles from these isotopes? Zn-32, Sn^+4, and Al. Thank you What is the main idea behind VSEPR? To demonstrate a double displacement reaction, the solutions of lead (Il) nitrate and potassium iodide are mixed. (a) What is the colour of the precipitate formed? Name the compound precipitated. (b) Write the balanced chemical equation for this reaction Which of the following could not be an empirical formula? #"C"_6"H"_12"O"_6",# #"H"_2"SO"_4",# #"NaCl",# #"H"_3"PO"_4",# #"H"_2"S"# At what temperature is this reaction at equilibrium? 0.40 grams of an organic compound 'A' (Molecular formula:#C_5##H_8#O)reacts with x moles of C#H_3#MgBr to liberate 224 ml of a gas at STP. With excess of #H_2#, 'A' gives pentan-1-ol. What should be the correct structure of 'A'? Does CH3CH2CH2CH2CH2CH3 or (CH3)3CCH2CH3 have stronger intermolecular forces? How much sugar should get dissolved in 240g of water to make a concentration of 4% ? What is the molarity of a solution prepared by mixing 13.9 g FeCl3 in enough water to make 300 mL of solution? Answer the following questions by referring to the equation below:? Calculate the [H3O+] for 0.34 M HCl. What is the Molarity of H3O+? Alaska is much less crowded than new jersey. It has an approximate population of 698000 and an area of 570374 square miles. what is the density of the block? What are some examples of the following types of chemical reactions? (Creative things that I can draw.. please no chemical formulas.) Synthesis reaction -Decomposition reaction -Double-replacement reaction -Single-replacement reaction How to convert 300 mL/hr to ML/min? If #psi=A(x)e^(itheta(x))#where #A(x) and theta(x)# are real functions prove that the probability current #J(x,t) = |A(x)|^2(/m)d/(dx)(theta(x))#.? Building block of matter? What is the molarity of a solution made by dissolving 67.3 g of lithium chloride in enough water to make 2.37 L of solution? What is the hydroxyl ion concentration of an acid solution for which [H+]=2,5x10-4? Balance redeox reaction in a basic medium.? Write the possible quantum number values for 10th electron of sodium? Balance redox reaction in an acidic medium.? An element has a electron configuration of 1s2 2s2 2p6 3s2. Upon forming an ion, its new configuration is 1s2 2s2 2p6. Which is the ion formed? For a particular reaction, ΔH = -30.9 kJ and ΔS = -120.8 JK−1. Assume that ΔH and ΔS do not vary with temperature. At what temperature (in Kelvin) will the reaction have ΔG = 0? You need 150 mL of a 80% alcohol solution. On hand, you have a 75% alcohol mixture. How much of the 75% alcohol mixture and pure alcohol will you need to obtain the desired solution? You will need __ mL of the 75% solution and _ mL of pure alcohol. From the equation 16Fe + S8 --> 8Fe2S3 How much Fe2S3 would be produced in grams if you started with 7.0g of Fe? Consider the reaction when aqueous solutions of aluminum bromide and lead(II) nitrate are combined. What is the net ionic equation? What is difference between graphite,bucky ball and diamond?5 differences Without drawing a Lewis structure, do you think that CO contains a single, double, or triple bond? What is the answer if you Convert 5.1 x 1023 atoms of Cu to moles of Cu. ? What volume of 0.125M H2SO4 is required to neutralize 2.5g of Ca (OH)2? Why BeF2 molecule has zero dipole moment although the Be-F bonds are polar.....? How are atoms, compounds , mixtures, molecules, elements related? How many grams of potassium nitrate can be dissolved in 50.0g of water at 50.0 degrees Celsius? Balance #"K + H"_2"O" -> "KOH" +"H"_2# ? Sterling silver,an alloy of copper, contains 7.5% copper by mass and has a density of 10.3g/cm^3. How many copper atoms are in a sterling silver sphere whose radius is 2.0mm? For the reaction 2NaI + Cl2 Õ2NaCl + I2 How many grams of NaCl is obtained if 5.0 grams of NaI reacts with 5.0 grams of Cl2? What are the effect of heat for long time on salt solution? How many moles of hydrogen, H2, are needed to react with 175 moles of nitrogen gas in the reaction forming ammonia? A sample of dolomite, a carbonate mineral, contains 0.5422 mol Ca, 0.5422 mol Mg, 1.085 mol C, and 3.254 mol O. What is the empirical formula of this sample of dolomite? Hi, I really need help. I done a Charles law experiment in class, but my numbers are not correct. Professor says it needs to be within 10%. Please change calculations so it is 10% THANK YOU? How is hydrogen bonding similar to dispersion forces? What is the formula for the conjugate acid for #"HSO"_4^(-)#? What determines the properties of elements? Please help! If Ophelia reacts 100.0 ml of 0.1 M HCl with excess magnesium, what volume of hydrogen at STP will be produced? Which of the following complexes exhibit the highest paragmagnetic behavior? a. [Co(ox)2(OH)2]^- b. [Ti(NH3)6]^3+ c. [V(gly)2(OH)2(NH3)2]^+ d. [Fe(en)(bpy)(NH3)2]^2+ SB has two Stable isotopes with determined masses of 120.904amu (121^Sb) and 122.904 amu (123^Sb). What are the relative abundances of these isotopes? Balance the chemical equation for N2+H2? What mass of water is produced when 15.0 ml of 0.50 M HF reacts? Assign oxidation numbers..? How do I calculate the standard potential of a chemical reaction? Why the solution gets saturated ? At the saturation point why no more solute can dissolve? Hi!Could someone help me? Calculate the energy required in joules to raise the temperature of 450 grams of water from 15°C to 85°C? (The specific heat capacity of water is 4.18 J/g/°C) Why isotopes of the same element have identical chemical reaction? What is that mean that half life of carbon -14 is 5700 years? Calculate the kinetic energy of moving electron which have a wavelength of 4.8pm mass of electron = 9.8×10^-3 kg,and h =6.63×10^-34? Thanku Q.The solubility product of nickel hydroxide Ni(oH2) is 2×10–15. Calculate the solubility? What is the answer to this question? Calculate the number of moles in 2.2 grams of niacin? How to do the matching? Elemental S reacts with O2 to form SO3 according to the reaction 2S+3O2Õ2SO3 Part A: 1.88x10^23 O2 molecules are needed to react with 6.67 g of S Part B: What is the theoretical yield of SO3 produced by the quantities described in Part A? Express in grams PH of 50cc of 0.01N HCL is decreased by? a)adding 50cc of 0.01N HCl b)adding 50cc of water c)adding 10cc of 0.0001 HCL d)adding 50cc of 0.1N HCL Which of the following incorrect? A. 2NA+2HCL=2NaCl+h2 B. Zn+H2SO4=Znoso4+2H2 Is there any relation between kinetic energy and velocity of gas molecule? A mixture of carbon dioxide and oxygen gases is maintained in a 9.81 L flask at a pressure of 2.28 atm and a temperature of 61 °C. If the gas mixture contains 13.8 grams of carbon dioxide, the number of grams of oxygen in the mixture is g? Why are covalent compound generally poor conductors of electricity ? Write the structural of 2 methyl cyclohexane ? What is the atomic structure of Al +3? What is the volume of a 0.50 mole of gas at STP if it behaves ideally? Using Le Chateliers principle, in the reduction of iron oxide, what would happen if you increase the concentration of CO? Why is the pizza sauce hotter then the pizza crust? What's the protocol for making 200mL of 15% (w/v) aqueous solution? Thanks a bunch in advance! What are the expected products of hydrolysis of lactose? The particles which of the following gases has the highest/lowest average speed? Which gas particles have the highest/lowest average kinetic energy? a.) argon at 20°C. b.)nitrogen at 20°C b.) nitrogen at 100°C. c.) helium at 100°C What is happening to the particles as solidÕliquid or a liquidÕgas and why does it make sense? What is the answer to 1st question and why? HOAc Ka = 1.8 * 10–5 H2CO3 Ka1 = 4.3 * 10–7 Ka2 = 5.6 * 10–11 Which of the following 0.01 M solutions has the highest pH? Atoms can be broken down through __________ processes. Please help?! Assuming complete precipitation of AgCl, calculate the sum if the molar concentration of all the ions if 2 lit. of 2M Ag2SO4 is mixed with 4 lit. of 1M NaCl solution? Calculate solubility of Ca3(PO4)2 in pure water if its solubility product is 1.08×10^-23? Solve for Volume (Ideal Gas Law)? If 20.0ml of NaOH are needed to neutralize 10.0ml of 3.0M H2SO4, what is the concentration of the NaOH? What is Iodine-131 nuclear decay series? What is the order of a reaction if its rate increases by a factor of 13 when the reactant concentration increases by a factor of 3.6? A reaction has a value of Kc at 400 degrees C of 0.500. If the value of Q for that reaction is 23.1, will the reaction need to go towards reactants or products to achieve equilibrium? Type the word. A 25g sample of garden compost was analyzed for chloride content. the sample was dissolved in water, and the chloride was precipitated as silver chloride 1.58g of dried precipitate was obtained. Calculate the mass percent of chloride in the sample? What mass of ethanol, C2H5OH, Is required to produce 300ml of a 0.5M solution? What is the freezing point of an aqueous solution containing 468 g of C12H22O11 in 350 g of water? Round off in 2SF. The mineral chalcocite (Cu2S) and malachite (CuCO3 (OH)2) are two primary sources of copper. what is the oxidation state of copper in each of these minerals? Given Ksp, how can I calculate solubility? What is the value of l in 4s1? Ionic equation for the reaction between dichromate ions & hydroxyl ions? Can someone help me solve this ?? How and where is Iodine-131 is made? The radioactive element carbon-14 has a half-life of 5750 years. A scientist determined that the bones from a mastodon had lost 67.9% of their carbon-14. How old were the bones at the time they were discovered? If you have 13 moles of Calcium, how many grams of Ca0 will be Produced? Explain K+,Ar,Cl are iso electronic but their sizes are different.why? If some solid chloride was dissolved in a saturated solution of PbCl2, how would this affect the molar solubility of PbCl2 ? How many moles of potassium nitrate are in 1.23 x 10^16 formula units? Use the following chemical equation to answer the question below. What if 0.060 g of magnesium completely react in 25 s, what is the average reaction rate in moles/second over that time interval? (Full question in screenshot) For the generic reaction 2 A + B <----> 3 C + D ? Calculate the ratio of the broglie wavelength associated with an alpha particle moving with velocity v and a deuteron moving with velocity 2v? A piece of wood has a mass of 200 g and a volume of 400 mL. calculate its density? What is redox reaction? Ionization Energy? Find atomic mass unit in terms of electrons? An aqueous solution containing 3,42 grams per 100 grams of water has a freezing point depression of 0,186deg c. What is the molecular mass of the solute? A 0.682 g sample of ICl(g) is placed in a 765 ml reaction vessel at 682 K. when equilibrium is reached in the reaction 2ICl(g) <=> I2(g) + Cl2(g) 0.0383 g of I2 is found in the mixture. What is Kc for this reaction? Chemistry question over thermodynamics? Determine the heat energy that must be added to bring 15 grams of water at 323K to 355K? In order to ionize a hydrogen atom, aphoton has a to have 13.6 eV of energy. What would be that photon's frequency (Hz)? A compounds empirical formula is CH .if the molar mass (gram formula mass) is 117g ,what is the molecular formula? Calculate the temperature of a 0.50 mol sample of gas at 0.987 atm and a volume of 12 L? When a 120 g sample of aluminum absorbs 9612 J of heat energy, its temperature increases from 25 (degrees) C to 115 (degrees) C. Find the specific heat of aluminum. Help? How do you measure the concentration of an acid or a base? What is 90.3333333 to 2 significant figures?? Thank you. As the strength of intermolecular forces increases, the ease of evaporation???? How do you figure out a molecule's solubility in water? Which of the following terms is used for the chemical composition of a compound? Please help? How are ferrous ion and ferric ion formed from iron atoms? In the oxidation of carbon monoxide to carbon dioxide, 2CO(g)+O2(g)-->2CO2(g), what is the numerical ratio of the rate of change in the concentration of CO2 to the rate of change in the concentration of O2? What is the molarity (M) of a solution that has 2.5 mols in .900 liters? In a closed chamber, 58 grams of propane gas (C3H8) and 200 grams of oxygen are sparked to initiate the comubustion what is the limited reagent in this reaction? In an experiment 350 mL of hydrogen gas was collected over water at 27 degrees C an 72 cm Hg. Then the absolute temperature doubled, the total pressure changed to 1 atm, and one-third of The has leaked out of the container. What would the final volume be? If pure phosgene at an initial pressure of 1.1 atm decomposes, what are the equilibrium pressures of all species? Sir O2 is the molecular form of element O.O.I know that we can separate the O2 into individual O. But if we apply or suply a tremendous amount of heat to 0 can we separate the atoms of O? ? ? In a row in the periodic table as the atomic number increases the atomic radius generally? In a first order reaction A---> B the ratio of molar concentration of A and B in the reaction mixture after 100 minute is 1:3. What would be the time needed from the start to have them in the ratio of 1:1? What properties make some metalloids useful in electronic equipment such as computers? Calculate the molarity of 25.0 grams of KBr dissolved in 750.0 mL? What is the formula for Barium nitrate plus sodium phosphate? What is the conjugate of NH3- ? How many grams of oxygen are needed to burn 10.0 moles of C3H8? Describe the movement of particles during equilibrium ? One of the hydrides of boron has molar mass=122.22g/mol and is 11.55% by mass hydrogen. Determine its molecular formula? According to the periodic table , a single carbon has a mass of 12.011 amu. what is the mass of a single carbon atom in grams? For the reaction 2 H 2 + O 2 Õ 2 H 2 O , how many moles of water can be produced from 10.3 mol of oxygen? Give me an example of voltaic cell. Explain how reactions occur in a voltaic cell? What is formed when calcium chloride and sodium carbonate are mixed? If the no.of protons of an element is 8 and no.of neutrons are also 8. Write the notation of that element? What is the stationary phase in gas chromatography? What is the solution to the question; The hydrogen ion concentration of a sample of orange juice is #2.0×10^-11mol# #dm^-3#. What is its #"pOH"#? Why aluminum alloy used in making aircraft body? Does HOF have hydrogen bonds? What quantity of heat in kj evolved when a 72.0g mixture containing equal parts of H2 and O2 by mass is burned? How would the percent yield be affected if the Na2CO3 was not throughly dried in the crucible before weighing? Concentrations of acids and bases? How do I do this? #DeltaH_(rxn) = -"2219.9 kJ/mol propane"#, so how much heat is released by combustion of #"16.50 kg propane"#? How to write an equation to show dissociation? Calculate the volume of 1 mole oxygen gas at 27 degree celcius and 4 atmosphere pressure. The molar volume of oxygen at NTP is 22.4 L/ mol? What is the molar mass of 31.3 g of gas exerting a pressure of 5.71 atm on the walls of a 3.04 L container at 297 K? What is the rate law equation for the following reaction (given the experimental data below)? How can you calculate mass by using volume and density? When 1414 J of heat energy is added to 38.7 g of ethanol, C2H6O, the temperature increases by 14.9 °C. Calculate the molar heat capacity of C2H6O? How many moles of hydrogen gas are contained in 21.3 L at stp? For a first order reaction if the time for 50%, 75% and 87.5% changes are t1, t2 and t3 respectively then what would be the value of t1: t2: t3 ? Which of the following is the buffer solution of strong acidic nature? Ionization help, please? Which of the two #O_2NCH_2CH_2O# or #CH_3CH_2O^-# is expected to be more stable and why? How do you balance this redox reaction? ) Explain the purpose of washing the sand with hot water. Why was it important to wash the sand with hot water? How would the experimental results be affected by washing the sand with cold water instead of hot water? How do I find the empirical formula of the product produced by heating 1 gram of Zinc Sulfur if i end up with 0,8375 grams of product ? For the ion #"NH"_4^+# the conductance at infinite dilution and 50deg c is 115. The equivalent conductance of #"NH"_4"NO"_3# at 50deg c and infinite dilution is 219. What is the conductance of the ion #"NO"_3^-# at 50deg c and infinite dilution? Why higher energy is required for stretching vibration as compared to the bending vibrantion? Consider the cell Cu/Cu^+2||Ag^+/Ag.If the concentration of Cu^+2 and Ag^+ ions becomes ten times, the emf of the cell is? Gaseous #HI# is synthesized from #H_2 (g)# and #I_2 (g)# at a temperature where #K_c = 1.00 xx 10^2#. Suppose that #HI# at #5.000 xx 10^(-1) atm#, #H_2# at #1.000 xx 10^(-2) atm#, and #I_2# at #5.000 xx 10^(-3) atm# are mixed in a #5#-#L# flask? C2H2 (20% H2SO4, / 1%Hg2+)= A. A(Zn-Pb /HCL(concentrate) = B identify the 'A ' & ' B'? Titrations with hydrated solutions Can anyone do it? Solve for Pressure (Ideal Gas Law)? If 0.248 mg of MgF2 is the maximum quantity that can be dissolved in 0.5 L of 0.1 KF, what will be the Ksp of MgF2 under the same conditions? How many mole of water boild of produced by the reaction of a 3.5 moles of methane with excess oxygen? For the first order reaction A----> B+C carried out at 27°C if 3.8×10^-16 % of the reactant molecules exist in the activated state then what would be the activation energy of the reaction ? Is lead heavier than gold? Which is strongest lewis acid and why bf3 or bh2? A sample of gas contains 0.2000 mol of CH4(g) and 0.4000 mol of O2(g) and occupies a volume of 20.3 L. The following reaction takes place: CH4(g) + 2O2(g)CO2(g) + 2H2O(g) Calculate the volume of the sample after the reaction takes place in liters? Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum) are needed to absorb 9.50 MJ of energy (in the form of heat) if the temperature of the sodium is not to increase by more than 10.0 °C? Use CP= 30.8 J/(K·mol) Why we take #"CaCO"_3# as standard to determine the hardness of water? 5C2O4 + 2MnO4 + 16H Õ 2Mn + 10CO2 + 8H2O If 4 mL of 0.001 KMnO4 solution is used to reactcompletely with 250 mL of saturated CaC2O4 solution according to the above reaction, what will be the Ksp of CaC2O4 under the same conditions? Calculate the osmolarity if the 1L solution Containing ? 1. 10 mM albumin 2. 5mM NaCl If a sample of NH3 is found to contain 0.480 mol of N atoms, how many H atoms are present? Why nitrogen is lighter than oxygen? ?? while the vapour of oxygen us lighter than nitrogen? ? Find the PH [H+] of 6.0x10^-2? How many grams of Ca(OH)2, (mw=74) are there in 50 mL of a 3.0 N solution? How do I calculate the molarity and percentage of acetic acid in vinegar? What does 2.0g/87gmol-1 equal? What is meant by half life of a radioactive element is 30 seconds calculate the deccay constant? A recipe calls for 8.5g/L of Phytagel. How much Phytagel (a dry solid) woudl you need to add if you only needed to make 600mL? Thanks in advance! A scientist measures a substance to be 0.6 grams. Calculate the percent of error in the measurement. Show all work for full credit. What is the percent of error? How do you balance a chemical reaction such as photosynthesis ?????? Can we recover bromine from sodium bromide (aq)+sodium acetate (aq) mixture? Why would all motion of atoms stop moving at zero kelvin? I need help with this Chemistry problem, how do I do this? 1 mole nitrogen gas and 3 moles hydrogen gas form .05 moles NH3 @ equilibrium. What is Kc of the reaction? Are gas molecules assumed to exert no forces of attraction or repulsion on each other? Explain why AsF5 does not follow the octet rule? How/why are there exceptions to the octet rule? What is the pH at 25 degrees Celsius of a 0.0064 M solution of a weak base with a Kb of 1.6E-9? What is the original molarity of a solution of a weak acid, given Ka and pH? The ionization energy of hydrogen is 13.6eV . What is the potential energy of the electron in n=2 state? What volume of 1.50M NaCl contains 3.40 moles of NaCl? How do we come to know which aldehyde is stronger reducing agent? methanal,ethanal,propanal,butanal A student used 25.0 mL of a stock solution of 2.00M MgSO4 to prepare a 0.200M solution. What is the final volume of the diluted solution? Can we tell from just the masses which of the two reactants will potentially be the limiting reagent? Why or why not? Keep in mind what is happening at the molecular level in a chemical reaction. Do all the molecules of a gas at a given temperature have the same kinetic energy? Consider the following reaction: 2NH3(g)-->N2(g)+3H2(g). A) Express the relative rate of the reaction with respect to each reactant and product. B)if the rate of production of H2 is 2.9•10^-6 Ms^-1 what is the rate of the reaction? Chemistry How long must a current of 2 amps run to liberate 2 moles of H2O when electrolyzed in the reaction below? How do you fine the MOLES of solute dissolved in a solution with only the concentration? A gaseous mixture consist of 6.91 grams of N2, 4.71 grams of O2 and 2.95 grams of He. What volume does this mixture occupy at 28 degree celcius and 1.05 atm pressure? What is the molecular formula of trichloroisocyanuric acid? A candle burning in a dark room is endothermic or exothermic process? The rate of hydrolosis of sucrose increases 4.1 times when the reaction temperature increases from 25°c to 35°c. Using this information (and appropriate assumptions) determine the energy of activation for the reaction. Please help? What the concentration of Mg in 5 moles of Mg(NO3)2.6H2O? Clara has a solution of potassium iodide in 2.0 L of water. She adds a small pinch of potassium iodide to the solution, and she observes it dissolving. Which term, if any, describes the solution? A gas has a pressure of 0.410 atm and a volume of 32 L. At what pressure would the volume of the gas change to 28L? [Equilibrium] Does my book contradict itself? The reaction 2A Õ A2 was experimentally determined to be second order with a rate constant, k, equal to 0.0265 M–1min–1. If the initial concentration of A was 2.75 M, what was the concentration of A (in M) after 180.0 min? Sugar is soluble in water ,although sugar is a non-polar substance?why?! If 35 grams of ammonia are reacted with excess oxygen gas, how many liters of water vapor are formed? E value for the cell reaction Cu|Cu^2+(0.001M)||Cu^2+(0.1M)|Cu is? Why are organic reactions slower than most inorganic reactions? Would an electron have to absorb or release energy to jump from the second energy level to the third energy level? How to find solubility of a salt based on Ksp? When N2(g) reacts with H2(g) to form NH3(g) , 92.2 kJ of energy are evolved for each mole of N2(g) that reacts.? Hydrocarbons, compounds containing only carbon and hydrogen, are important in fuels. The heat of combustion of cyclopropane, C3H6, is 499.8 kcal/mol. ? A molecule of carbonic acid contains 3 atoms of oxygen for every 2 atoms of hydrogen. Could a compound containing 81 hydrogen atoms and 54 oxygen atoms be carbonic acid? Explain. What mass of oxygen is required to react completely with 1.20 mol of methane CH4? A 30kg sample of plutonium 239 will decay by 1180 years. What is the half life of plutonium 239? How is rate of reaction related to activation energy? The rate of diffusion of two gases are in the ratio of 2:3 then their corresponding densities are? What is the difference of a monosaccharide and disaccharide ? Why Mg2N2 is not possible? How many unpaired electrons are in manganese? Can someone help with this question? Why does egg float on the solution of salt and water? Partail pressure gas of mixture air in sea level .when you know?%78is nitrogen. %2is oxygen .%1is dioxide carbon How do you write a protocol for 400mL of 0.8M NaCl (FW NaCl = 58.44) ? Much appreciated! How to balance this chemical equation HCl (aq)+ CaCl (s)- CaCl(aq)+CO2(g)+H2O (1) ? A sample of concentrated nitric acid has a density of 1.41gmL and contains 70.0% HNO3 by mass. (a).what mass of HNO3 per liter of solution? (b).what is the molarity of the solution What happens when aluminum is added to sodium hydroxide? Do solids occupy space? How many grams of Calcium will be needed to produce 200 grams of Vanadium? Please I need to know what concentration of NaOH to add to butyric acid to get butyrate? Nitrous oxide (N2O) is used as an anesthetic. The pressure on 2.5L of N2O changes from 105 kPa to 40.5 kPa. If the temperature does not change, what will the new volume be? What are the magnetic quantum number(s) of #3d^5#? Calculate the pH of a saturated aqueous solution of #Co(OH)_3#(#K_(sp) = 2.7*10^(-43)#)? 100ml of 0.1 M HCl , 0.1 M KOH Were added till acid is 3/4 neutralized calculate concentration of salt formed? How do I estimate the difference from ph7.0 from NaCl ph12.51? Is CaO an alkali or a base? If radioactive elements start their half-life after the atoms are made through nuclear fusion in other stars, aren't scientists calculating the birth year of the atom instead of the birth year of Earth? What is the percent solution if 25mL of #CH_"3"OH# is DILUTED WITH 150mL with water? I need help to know if Ethanol has a melting point of -115c and a boiling point of 78c what state will it be at -20c? 0.1 mole of N2O4(g) was sealed in a tube under atmospheric conditions at 25° C. Calculate the number of moles of NO2(g) present, if the equilibrium #N_2O_4(g) rightleftharpoons 2NO_2(g)# (Kp = 0.14) is reached after some time ? Consider the reaction when aqueous solutions of sodium acetate and cobalt(II) bromide are combined. The net ionic equation for this reaction is?: label aq, s, l, or g If you make water particles absolutely still will they become a solid? and would their temperature change? Thank you! The following reaction has an equilbrium constant Kc =3.07e-4 at 24 degrees C. 2NOBr(g) <---> 2NO(g) + Br2(g) ? What is the concentration of ammonia in the solution? Why is it important to make sure all the NaHCO3 has reacted with the HCl before you stop adding acid ? Suppose you have a gas in a container being pressed down by a piston. The initial volume of the gas is 5.0 m3 and the pressure is 7.5 mmHg. If the volume decreases to 4.0 m3, what is the pressure? (The product of the volume and pressure remains constant.) What is the difference between an isotope and a radioisotope? What intermolecular forces are present in about boiling point? Determine the molecular formula of a compound that is 49.48%Carbon, 5.19% hydrogen, 28.85% nitrogen, and 16.48% oxygen? The molecular wight is 194.19g/mol. For the following reaction delta H = 2816 kJ. 6 CO2 (g) + 6 H2O (l) <---> C6H12O6 (s) + 6 O2 (g). What will be the effect on the equilibrium yield of C6H12O6 (s) if: ? A 10.2−g sample of dinitrogen monoxide is confined in a 5.74−L vessel. What is the pressure (in atm) at 125°C? What are 3 ways to increase solubility of a solid? You have 894 mL of chlorine trifluoride gas at 772 mmHg and 28°C. What is the mass (in g) of the sample? What is the maximum temperature of the water in the insulated container after the copper metal is added? (also steps on how to solve this problem please) Balance the equation: C3H8+O2=CO2+H2O? What do you mean by vanderwaal forces ? How many moles of cholesterol are represented by 2.05 * 10 ^7 molecules of cholesterol? Show the concentration of water in water is 55.56M. Hint: Start with the density of water? Why does C-N have a greater electron density than C-Cl? What are the reactants of NaCl ? What is the molar mass of adrenaline (C9H13NO3) ? What is the molar mass for Mn2O7, an oxide of manganese? One half of a mole of atoms would contain how many atoms? How do you find the number of neutrons in an element on the periodic table? How many formula units make up 31.8 g of magnesium chloride (MgCl2)? The Ksp of calcium hydroxide is 7.9*10^-6 find the pH of saturated solution of calcium hydroxide? Predict the formulas of the ionic compounds formed by the following elements nickel and sulfur? What substance is formed when magnesuim hydroxide reacts with hydrochloric acid??? Calculate the mass of NaOH needed to make 250ml of 0.200 M aqueous solution? How many grams of V can be produced with 4.6 moles of V20S? 3.00 moles of gas are in a container with a volume of 60.0 liters and at a temperature of 400. K What is the pressure inside the container? Should I write #H_2SO_4# like a catalyst? What is the energy of a photon that has a wavelength of 9.0 m? From #PV = 1/3 mN<< upsilon^2 >>#, show that the kinetic energy for a mole of an ideal gas is #E_k = 3/2 RT#? What is the word equation for sodium chloride and sodium bicarbonate and water? How many moles of silver nitrate do 2.888x10^15 formula units equal? A mixture of calcium nitrate and sidium chloride ,does not react but a mixture of calcium nitrate and sodium carbonate,produces a white precipitate.What is that precipitate? Calculate the formal charge present in each atoms of ozone? If a reaction equation is balanced, then _____? Hi, could someone tell me if this is right and I set it up correctly? What mass of NaOH is needed to produce 400 g of a solution that is 12.0% by mass? Isn't it a mass solute/mass solution X 100? I set it up 12% 400/100 and got 48.0, is this correct? The sample now has a volume of 392 mL at a pressure of 0.987 atm and a temperature of 21oC. ? ) Explain two sources of error that may occur during the filtration process. For each source of error, explain how this error would affect the values of the mass % for each component. (Would the mass % be larger or smaller than the correct value? How can i solve this question ? Why AgNO3 is strong electrolyte? 300g of mg is burned on fire to produce magnesium oxide. final product weighs 4.97. what is the empirical formula for magnesium oxide? What will be the pH of a 0.02 M Ca(HCO)3 ? What will be the pOH of a 0.02 M of Ca(OH)2 ? Glass is prepared by hearing sand with limestone and washing soda 8. _SiO2(s) + _ CaCO3(s) CaSIO3(s) +Co2(g) ? 9. _ SiO2 (s) + _ Na2CO3(s) Na2SiO3 +_ CO2 (g) ? 2.0 grams of ZnSO4 reacts completely with Li2CO3; how many grams of Li2SO4 would be produced? Does 2-methyl-3-hexanone exhibit hydrogen bonding? Help answer this question Which is the best answer to complete the white areas or dashes? Using the Maxwell Boltzmann function. Calculate the fraction of argon gas molecules with a speed of 305m/s at 500K? What is incineration?? What’s the molar mass of Freon, and what is the molecular formula (9.92% C, 58.6% Cl, and 31.8% F)? Write balanced equation for octane combustion. Cylinder is .5 L. Filled with air 45 degrees C at 1 atm. Air is 20% Oxygen. How many grams of octane need to react fully with oxygen? Two particles with charges #q_1# and #q_2# are separated by distance d. Rank these scenarios according to the magnitude of the electrostatic (coulombic) potential energy. Ignore sign. Rank from height to lowest energy? Why does ionization energy decrease as you move down a group in the periodic table? Hydrogen has two stable isotopes, and sulfur has four stable isotopes, and How many peaks would you observe in the mass spectrum of the positive ion of hydrogen sulfide (H2S)? Assume no decomposition of the ion into smaller fragments? Calculate the molar mass of Al(C2H3O2)3 ? Which Best describes the SI unit mole? A compound contains 2.8% Fe by mass.If the compound contains single Fe atom in its one molecule, then the molar mass(g/ml) of the compound is? (Fe=56 amu) The half-life of an isotope is 30sec. For a 1000g sample, what made of this isotope remains after 5.0 min? A 2.0 liter bottle can withstand a pressure of 5.0 atm. 120 mL of liquid ethanol, #"C"_2"H"_5"OH"#, (density 0.789 g/mL), is poured into the bottle and sealed. The bottle is heated to 100 C, changing all the liquid to gas. Will the bottle explode? How do I calculate the number of moles of acetic acid present in the aliquot (25mL of a 10% vinegar solution)? What element is this?? Cheap replacement for nitrogen gas to protect surfaces. A sample of oxygen is collected over water at 23°C and 770.0 mm Hg pressure. What is the pressure of the dry gas? (Vapor pressure of water at 23°C is 21.1 mm.) What kind of reaction is this 8 Fe + S Õ 8 FeS ? What are the moles of substances present at equilibrium at #450^oC# if 1 mol #N_2# and 4 mol #H_2# in a 10 L vessel react according to the following equation? #N_2(g)# + #3H_2(g)# #rightleftharpoons# #2NH_3(g)# Why aren't the atomic masses of most elements whole numbers? The equilibrium constant Kc for the reaction is 3.8 10-5 at 727°C. What are Kc and Kp for the following equilibrium at the same temperature? Pure solids and liquids can be eliminated from the equilibrium constant expression because? What volume will the same gas occupy at 1.00 atm? Equation for questions 5-8: ___C3H8 + ___O2 à ___CO2 + ___H2O 5. How many moles of carbon dioxide will form if 8.5 moles of C3H8 is burned 6. If 15.0 moles of oxygen are used, how many grams of water will form? 7. If 200.0grams of C3H8 burns, how many A gas sample occupies volume of 2.5 L at a pressure of 1.5 atm. What would be the volume of gas if its pressure is reduced to 1 atm at the same temperature? Find the Given, UnknownLNDP/LSNF with a solution and answer. Thank you. When a certain 2.5-L vessel is filled with an unknown gas at STP, it weighs 2.75 g more than when it is evacuated. Determine the molar mass of the unknown gas? How many grams will be needed to produce 200 grams of Vanadium? You have a sample of material with the empirical formula of CH. The sample you have has a mass of 52.0g What is the molecular formula for the sample? You have a 500Kg sample of Magnesium Chloride (MgCl2). What is the amount of Chlorine present in the sample in grams? Given an aqueous solution in which the [H+] = 2.0 x 10-5 M, what is the molar hydroxide ion concentration? In the laboratory a student combines 39.3 mL of a 0.165 M manganese(II) chloride solution with 25.3 mL of a 0.328 M manganese(II) sulfate solution. What is the final concentration of manganese(II) cation ? M ? 12. When the vapor pressure of water is 30 kpa the temperature of the water is? A) 20 degrees celesius B) 100 degrees celesius C) 70 degrees celesius D) 40 degrees celesius Consider the neutralization reaction between CH3COOH and Sr(OH)2. Complete and balance the neutralization reaction, name the products, and write the net ionic equation.? If the energy of the reactant is greater than the energy of the product, will energy be released or absorbed by the reaction? How much heat in joules would you need to raise the temperature of 1 kg of water by 5°C? What best differentiate between real gases and ideal gases? How do I find the reaction potential of forming #"MgO"# and #"Zn"# from #"ZnO"# and #"Mg"#? We dissolve 0.500 g of an organic acid #C_6H_10O_4# in water and titrate the solution with 0.250 mol/L KOH. It takes 27.4 mL of KOH to neutralize the organic acid. It is a monoprotic or polytropic acid? Which of the compounds would you expect to have the highest melting point NaCl, H2Se, O2, H2O, H2S, CO2, MgO? Calculate the molar volume of 4.3 mole of oxygen? Write a balanced equation to show the reation of sulfurus acid with lithium hydroxide to form lithium sulfite and water ?? How to calculate rate of dissolution? A dirty and impure sample that weighs 43.4 g contains a certain percentage of magnesium nitride. Magnesium nitride reacts with water.The sample is exposed to an excess of water to give 32.9 g Mg(OH)2. What percentage of Mg3N2is in the original sample? For the reaction: H2(g)+1/2O2(g)=H2O(g). The #DeltaH_(rxn)^@# = -241.8 Jmol ^-1 What quantity of heat, in kj, evolved when a 72.0 g mixture containing equal parts of H2 and O2, by mass, is burned? Chemistry help ASAP? How many moles of H are present in 1.70 moles of Benadryl? The value of the rate constant for the reaction between A & B was measured using pseudo-zeroth order conditions. The overall order of reaction was determined to be third order. When B was present at...? Find molarity of NaOH given the mass is 312g? Until roughly 1970, tritium (3H), a radioactive isotope of hydrogen, was a component of fluorescent watch dials and hands. For 3H, t1/2 = 12.3 yr. Assume you have such a watch. If a minimum of 14.0% of the original tritium is needed to read the dial in? When is extraction an appropriate technique for separation (e.g. is there an ideal sample size range, is there a minimum starting purity, what final purity should be expected, etc.)? How to determine moles in stoichiometric ? What is the ratio of pH of 0.1M H2SO4 and 0.1N H2SO4? What is the oxidation number of CuNO3? Phosphorus trichloride is a commercially important compound used in the manufacture of pesticides, gasoline additives, and a number of other products. It is made by direct combination of phosphorus and chlorine. How to answer the questions below? An ideal gas at #"155 kPa"# and #25^@ "C"# has an initial volume of #"1 L"#. The pressure of the ideal gas increases to #"605 kPa"# as the temperature is raised to #125^@ "C"#. What is the new volume? How do you calculate equilibrium concentrations of species when the concentration of one specie is unknown? S8 + 4 O2 = 8 SO If we started with 4.0 grams of Sulfur, how many moles of Sulfur Dioxide would be produced? Bromine has two isotopes bromine75=50.51% & bromine81=49.49% the average atomic mass of bromine is? The mass of aluminium in aluminium sulphate is 0.0675 g. Find the mass of sulphate? What is the equation for rate of reaction? How many grams of H2 are produced if 3.0 grams of Mg are reacted with excess HCI? What is the mass of acetic acid present in a sample that is titrated with 16.25 ml of 0.3015 M NaOH? 4 C3HsN309 (1) 12 CO2 (g) + 6 N2 (g) +10 H20 (g) + 02(g) What volume is occupied by all of the gases produced when 1.00 kg of nitroglycerin explodes? The total pressure is 1.54 atm at 423°C Determine the percent yield of reaction that produces 28.65g of FE when 50.00g Fe2O3 react with excess Al according to the following reaction. Give the anwers with four significant figures? Balance the following reaction? #(MnO_4^-) + C_2O_4^(2-) + H^(+) -> Mn^(2+) + CO_2 + H_2O# In excited state of carbon four valencies are not equivalent.could anybody explain it? What is the oxidation number of c in C6H12O4? What is the empirical formula if you have 42.07% sodium, 18.89% phosphorous, and 39.04% oxygen? A radioactive isotope of potassium (K) has a half-life of 20 minutes. If a 40.0 gram sample of this isotope is allowed to decay for 80 minutes, how many grams of the radioactive isotope will remain? Why law of conservation of mass has to be obeyed during stoichiometry calculations? Why is HF acid so reactive, and why does sand dissolve in it rather than in any other solution? Identify the significant number of 0.0056? 2atm 20°c temperature 10g O2 volume 3.76 R value? How to determine whether a molecule is SC, FCC, or BCC? How many joules of heat must be added to a 2 kg sample of methanol for it to boil? If you have 16.8 L of gas at 1.0 atm, what is the new pressure if the volume is reduced to 15.0 L? Absorbance was monitored as a function of time during the course of a reaction. The product was produced from the reaction of two reactants; one of the reactants was present in a large enough concentration (0.2 M) that it can be considered to be a ? Oxalic acid is diprotic. What volume of 0.100M KOH is required to neutralize 25ml of 0.333M oxalic acid? The average molecular speed in a sample of CO2 gas at a certain temperature is 384 m/s. The average molecular speed in a sample of H2 gas is m/s at the same temperature.? What isotopes are created when you burn off potassium nitrate and sugar? A first order reaction has rate constants of #4.6xx"10"^(-2)" s"^(-1)"# and #8.1xx"10"^(-2)" s"^(-1)"# at 0 degrees Celsius and 20 degrees Celsius, respectively. What is the value of the activation energy? How to learn number of neutrons to take out mass of an element? What is the oxidation no. of MN in Mn²O³? What is the real life application of charle's law? 10 g of CH4a are allowed to react with 50g of oxygen.what is the limiting reactant which remains unreacted . calculate the mass of CO2 and H20? A 2.00-L vessel contains 1 mol #N_2#, 1 mol #H_2+# and 2 mol #NH_3+#. What is the direction of reaction (forward or reverse) needed to attain equilibrium at #400^oC#? The equilibrium constant #K_c# for the reaction is 0.51 at #400^oC# (rxn below) A sample of helium gas at 25°C is compressed from 200 cm3 to 0.240 cm3. Its Pressure is now 3.00 atm. What was the original Pressure of the helium? What is the oxidation state of Fe in #"FeCl"_2#? You have 3.0 Mol of CoCl2. What is the mass of the sample? Distinguish between thermochemical reaction and photochemical reaction? Which of the following substances has a standard heat of formation ΔH°f of zero? A. Pb(s) at 500°C. (The melting point of Pb is 328 °C.) B. C3H8 (g) at 25.0°C and 1 atm pressure. C. Solid glucose at room temperature. D. N2(g) at 1 bar pressure. How much Aluminum Chloride in grams is needed to completely precipitate 1.74 grams of K2SO4 (FW=174 g/mol)? What will be the nature of aqueous solution of Na2CO3 and why? The heat of combustion of napthelene c10h8 is -5133 kj/mol .find the value of enthalpy change ? Calculate the pressure (atm) required to compress 50 ml of gas at 0.20 atm into volume of 10 ml ?? Compute normalization constant A if #n=1#? What is the limiting reactant if 4FeS2 + 11 O2 --> 2Fe2O3 + 8 SO2 26.2 g of FeS2 react with 5.44 g O2. ? Which of the following ions does not liberate hydrogen gas on reaction with dilute acids ? How do you write and balance the equation "lithium metal reacts with phosphorous"? Propane gas us mixed with chlorine gas.the mixture is left in the sun for a white. 1.write a balanced equation for the reaction?(use formulae) Caesium has lower threshold frequency than sodium. Why? What enthalpy change is occurring? How to memorize electronegativity chart? A student wants to make 135. mL of 8.5 M KBr by diluting a 6.0 M KBr solution. How much of that solution should be used? Calculate? the volume occupied by 8.8 gram of CO2 at 31.1 degree Celsius and 1 bar pressure R= 0.083 by LK inverse mole inverse( molecular mass of CO2=44 gram mole inverse) Absorbance was monitored as a function of time during the course of a reaction. The product was produced from the reaction of two reactants; one of the reactants was present in a large enough concentration (0.2 M) that it can be considered to be a ? What is Carbon 500? How can I calculate #K_c# of this reaction? The combustion of acetylene gas is represented by this equation: 2C2H2(g) + 5O2(g) - - > 4CO2 (g) + 2H2O(g) How many liters of CO 2 are produced when 52.0 g C2H 2 burns in oxygen? (Assume STP.) What is the volume (in L) of 2.5 moles of a gas that has a pressure of 5.25 atm and a temperature of 450 K? (10) Ammonium nitrate will decompose explosively at high temperatures to form nitrogen, oxygen, and water vapor. 2NH4NO3(s) - - > 2N2(g) + 4H2O(g) + O2(g) How many grams of NH4NO 3 are needed to produce 30 L of O 2 gas? (Assume STP.) A balloon is filled with helium to a volume of 12.5 liters. If the temperature of the gas is 25°C and the pressure is 101 kPa, how many moles of helium are in the balloon? How many helium atoms are in it? (9) When the temperature of a rigid hollow sphere containing 685 L of He gas is held at 348OC, the pressure of the gas is 1.89 x 103 kPa. How many moles of He does the sphere contain? Why is it important to have a standard of measure? Ap chem question? Please Help with the following problem :) : Calculate the percentage of CaCO3 in a sample, if all the amount of calcium comes from CaCO3, given that %oxide:0,38% CaO ? A reaction has the following rate law: Rate = k[NO2]2. What are the units of the rate constant,k? Chemistry question? A small peice of potassium is dropped in a trough of water Write a main observation? What’s the protocol for 400mL of 0.8M NaCl? Any help would be much appreciated! Find [H+] in 0.003M NaoH? Identify? the Lewis acid from the following species a) OH- b) F- c) H+ d) BCl3 1g of ZnS combined with #O_2# to produce 0,8375g of product. What is the empirical formula of the product ? PH scale lies between 0 to 14 explain? Why cant lead (ii) chloride be prepared by action of dilute hydrochloric acid on lead(ii) carbonate? Mass of a molecule of : mO2 = 5.3 x 10-20 kg mCO2 = 7.3 x 10-20 kg mNe = 3.3 x 10-20 kg mCl2 = 1.18 x 10-19 kg What is the temperature of two moles of a sample of gas with a volume of 2.5 x 10-2 m3 at a pressure of 3 atmospheres? Methane is burn in air? How many grams of NaN3 are needed to make 60 L of N2 gas? #2NaN_3->2Na +3N_2# For the reaction, #"2XO + O"_2 Õ "2XO"_2#, data obtained from measurement of the initial rate of reaction at varying concentrations are? Haemoglobin contains 0.33 percent by mass iron. There are two iron ions in one molecule of haaemoglobin. What is the molecular mass of haemoglobin? Whether ether is polar or non polar? .54 mol of H2 is contained in a 2.00 L container at 20.0 oC. What is the pressure in the container in atm? In a combustion reaction, acetylene (C2H2) combines with oxygen to form carbon dioxide and water. If 3.80 moles of oxygen are used up in the reaction, how many moles of water are produced? You have 10 grams of C10H10O2. How many moles are present? How many molecules are present? If the total number of ions of calcium phosphate is 3.01 × 10^23. What is the number of moles of calcium phosphate? Explain effect of temprature on change of state of matter? Calculate the volume in xubic centimeter of one mole of nitrogen(density = 2.0 g/ cm)? How many protons, and electrons are in NH4+? What are ions? How much heat is required to heat a 20 g sample of ice from -10 c to liquid water at 50 c? If 110.4 grams of oxygen gas exerts 101.3 kPa of air pressure at 0°C, what volume would the gas occupy? Compute the root-mean-square speed of H2 molecules in a sample of hydrogen gas at a temperature of 193°C. m s-1 ? Why crystals appear when a super saturated solution is cooled ? What is the dissolution reaction of the CH3COO- anion and what is the type of dissociation constant do you get from this reaction? If you suspend 8.5g of sucrose in 100mL of deionized water, what is the resulting weight/volume percent of the solution? If 5m of copper wire weighs 3.15g. How much does 0.85m of copper wire weigh and what is its density? What is a calibration curve and how is one constructed? If you suspend 8.5g of sucrose in 500mL of deionized water, what is the molarity of the resulting solution? How many moles does 8.5g of sucrose equal? Carbon-14 decays by beta emission to stable isotope of nitrogen. Carbon-14 half-life of 5700 years(i) A pure sample of carbon-14 initially contains 8.0 × 1020 atoms. Calculate number of atoms of carbon and of nitrogen present in sample after 11 400 years? What is the net ionic equation of the reaction of FeCl2 with NaOH? Express you answer as a chemical equation including phases. What is the net ionic equation of the reaction of MgSO4 with Pb(NO3)2? Express you answer as a chemical equation including phases. The slope of a line _______ to the curve at time zero gives the instantaneous rate of reaction at that point? Find the solubility of AgCl in mol/l in a solution of 0.5M MgCl2 Ksp for AgCl is 1.8*10^-10? 3 mol of hydrogen iodide,2 mole of hydrogen and 1 mole of iodine are placed together in a cylinder. After equilibrium has been established what are the concentrations of all reactants and products. If the value of Kc = 0.02? What will be the product when PCl5 reacts with ethyl alcohol? If the temperature of a gas rose from standard temperature to 35 degrees Celsius, what was the initial pressure applied to it if the final pressure is 72.5 psi? The average molecular speed in a sample of CO2 gas at a certain temperature is 384 m/s. The average molecular speed in a sample of H2gas is m/s at the same temperature. ? What is the mass of the excess reactant? What is the theoretical yield of H2SiF6? What is the percent yield? Why are chemical equations useful? The radiusof the electron when the shell number is n=5 and n=200 ? There is a sample of 40g of MgCl2. How many atoms of Cl are in the sample? What is the atomic number and atomic mass of 92 uranium- 235? A neutron with a mass of 1.68x10^-24g moves from a nuclear reactor with a velocity of 3.22 x 10^3 m/s. What is the de Broglie wavelength of the neutron? More Periodic Trends help, please? why the boiling point of water is much higher than expected based on the size of the molecule. explain with a diagram ? A precipitate forms when aqueous potassium sulfide and aqueous barium nitrate are combined, what is the net ionic equation? Help! Arrange the acids in order from weakest to strongest? How does the Law of Conservation of Mass relate to Stoichiometry? What is the pH of 10^-8M of KOH ? Why does a reagent have to be in large stoichiometric excess in order for the reagents term in the rate law equation to be considered pseudozero order? Calculate acid ionization constant.? The solubility of silver acetate in pure water at #25^o#C is #8.35 g/L# and #61.8 g/L# in an acid solution of #pH=3#. Calculate? What is the atomic weight of an element who’s atoms contain5 protons 5 electrons and 5 neurons? If you have 14 moles of chlorine gas how many grams of it do you need ? Please Help find Ka for a Weak Acid? What is the molarity of a 0.30 liter solution containing 0.50 moles of NaCl? What are the final #of moles (theoretical ) out of 1.76g of cuco3 to cuo +co2? The half life of radon is 3.8 days. Calculate how much radon of 15 miligram will remain after 38 days? Initially, only A and B are present, each at 2.00 M. What is the final concentration of A once equilibrium is reached? What is the chemical equation for baking soda and vinegar? In a potential energy diagram for an endothermic reaction? Can anyone tell me how #NH_3# can be formed from #CaO#? How many moles of sodium phosphate would be required to react with 1.0 mol of silver nitrate? Fe(s) + O2(g) --> Fe3O4(s) When 13.54 g of O2 is mixed with 12.21 g of Fe, what mass in grams of excess reactant remains when the reaction is complete? 2 decimal places How to convert molecular weight from g/mol to lb/mol ???? State three definitions of entropy? When equal volumes of KF and 4*10^–4 Ca(NO3)2 solutions are mixed together, what will be the minimum concentration of KF solution to start precipitation? You have 10 grams of C10H10O2. How many moles are present? How many molecules are present? What is the concentration of [OH-]in a solution with anb[H+]concentration of 1.3×10–4M? What is the concentration of gold when 20mL of a 2 ppm gold sample is extracted into 2 mL of DIBK, assuming 100% extraction efficiency? Is Al2Br6 covalent or ionic...why? Role of manganese dioxide in decomposition of potassium chlorate?? If more silver nitrate is added after the indicator changes color, what effect would this have on the calculated resultes for the chloride ion concentration in the sample? What is the ionic formula for sodium carbonate? Given ; 4.16g of carbon and 0.39g of hydrogen. The atomic weight of carbon is 12.011g/mol and the atomic weight of hydrogen is 1.008g/mol. Use this knowledge to calculate the molecular formula for benzene, what is the chemical formula for benzene???? How do I do this? What is the difference between organic and inorganic chemistry? When a strong acid and a base are mixed, what is the end result? Possible isomers with structure and explanation? cis-1.3-diethylcyclohexane In a room at 24.5 degrees Celsius a balloon is filled with helium to a pressure of 768.0 mmHg. What is the density? What is a laughing gas? Thanks Chemical formula of sulphur? A 1.62 gram sample of XeFx (g) has a volume of 274.8 cm3 at 448 mmHg and 25.0 °C. Can you identify the subscript x and name the compound? How do we determine the correct coefficients in a chemical eqaution? How many functional isomers are there for butan-2-ol and their names? Complete the following equations? a) Help! pOH, pH, [H3O+] and [OH-]? .54 mol of H2 is contained in a 2.00 L container at 20.0 oC. What is the pressure in the container in atm? For which of the following is deltaH equal to deltaE(internal energy)? Help me answer this question Why is the answer Z and not Argon? How much heat is absorbed by a 67g iron skillet when its temperature rises from 9 degrees C to 25 degrees C? Help with Concentration from pH? Help! What is the ionization constant problem? How to determine Concentration from pOH? 41) A compound that is composed of carbon, hydrogen, and oxygen contains 70.6% C, 5.9% H, and 23.5% O by mass. The molecular weight of the compound is 136 amu. What is the molecular formula? A) B) C) D) E) How many moles of gas are contained in .89 L at 21.0 oC and .987 atm pressure? Calculate the volume of gas that can be obtained from reacting 1.8 g of calcium carbonate with dilute nitric acid at R.T.P? (1 mole of gas occupies 24 000 cm3 at R.T.P ) What are the shapes around boron in the boronhydride iom and in boron trifluoride? Find out the % composition of sodium carbonate ? A gas confined in a rigid container exerts a pressure of 9.9 atm at a temperature of #17^@"C"#. What will the pressure be in atm in the container if the gas is cooled to #-23^@"C"#? What is the mass of 48dm^3 of oxygen at r.t.p? How many grams of HCl are required to prepare 200.00 ml, 0.55 M HCl solution? How many grams are in .49 mol of CO? Please help with this dissociation reaction? A volume of a gas is 20.4 L when the pressure is 925 kPa. At constant temperature, a change in pressure causes the volume of the sample to change. If the new volume is 30.6 L, what is the new pressure? Write the chemical formula for the conjugate base? Which best describes the motion of helium atoms in gaseous helium? A. The helium atoms can slide past another one? B. The helium atoms move quickly in all direction ? C. The helium atoms are fixed in one place? D. The helium atoms move slowly only after How many calories are required to raise the temperature of a 4.90 g sample of iron from 15.3 degrees C to 32.4 degrees Celsius? Iron has a specific heat of 0.108 calorie gram degrees Celsius. Consider Li2+ in the gas phase. As an excited electron falls from energy level n = 6 to a lower energy level, a photon of light is emitted with a wavelength of 0.1216 µm. What was the final energy level of the electron? Group 1A element sodium combines with group 7A element chlorine to form sodium chloride or tabke salt. Based on this information, which expression is true about the electronegativity calues of these two elements? How many grams of CO2(g) are produced? Which has the highest pH the one with strong acid or the one with weak acid? The rate constant for the reaction: NO2(g)+O2(g)---->NO3(g)+O2(g) was determined over a range of 40.0 K, with the following results. Determine the activation energy for the reaction (kJ/mol) and calculate the rate constant of the reaction at 300K? How does salting icy roads turn the ice into water? A 13.1 g sample of an aqueous solution of nitric acid contains an unknown amount of the acid. If 22.8 mL of 0.456 M potassium hydroxide are required to neutralize the nitric acid, what is the percent by mass of nitric acid in the mixture? % by mass? Why doesn't the concentration of H3O+ decrease when you add HCl to water? Solution contain 8.3 g of nonvolatile substance dissolved in 1 mol CHCl3 has vapor pressure 511 torr the vapor pressure of pure CHCl3 at the same temp is 526 calculate the mol fraction of the solute and number of mole solute in solution ?? Which ion has the most shells that contain electrons?? Who to write -c+o2=co2in moles reaction? A sample of an ideal gas has a volume of 3.65 L at 14.20 °C and 1.80 atm. What is the volume of the gas at 24.80 °C and 0.993 atm? 2CuCl2 + 4KI --> 2 CuI + 4KCl + I2 When 0.56 g of CuCl2 react with 0.64g of KI, how many g of I2 are formed? What are the products of calcium chloride and sodium sulfate? And is the product soluble? The three hydrogen atoms and one nitrogen atom in an ammonia molecule form a tetrahedron—a pyramid with four triangular faces. Three of these faces are isosceles triangles with the nitrogen atom at the vertex. If the distance between the hydrogen...? 15.5g of potassium nitrate is dissolved in 200cm 3 of water. How many moles of potassium nitrate are presented in 15.5g of the compound? What is the covalent compound formula for N2O5? Writing chemical equations? Complete the following equation? Any 5 physical and chemical properties of kerosine oil? What pressure is exerted by 0.450 mol of a gas at 25 Celsius if the gas is in a 0.650 L container? Ammonium nitrite, #NH_4NO_2# decomposes in solution according to the reaction: #NH_4NO_2(aq)# #rarr# #N_2(g)# + #2H_2O(l)# The concentration of #NH_4^+# ion at the beginning of an experiment was 0.5 M. After 3 hrs, it was 0.432 M (Q below?) What happens when HCl is added to galvanised iron coil? Help on Gas Laws (Combined Gas Law)? Which is a factor in determining the average atomic mass of an element? Hi, could someone please help:)..I'm sure it's the ideal gas law, but not 100% how to get answer. A volume of 122mL of argon, Ar, is collected at 50 degrees Celsius and 758 torr. What does this sample weigh? Will you please show steps and explanation. Sodium(2) Nitrogen Oxygen(3) ? How many joules of heat must be added to a 2 kg sample of methanol for it to boil? Complete combustion of C14H18O7 to CO2 and H2O. You have 315.0000 grams of C14H18O7. How many grams of O2 are required? How many grams of CO2 are generated? How many grams of H2O are generated? Aluminum reacts with aqueous sodium hydroxide to produce hydrogen gas according to the following equation: 2Al(s) + 2NaOH(aq) + 6H2O(l)2NaAl(OH)4(aq) + 3H2(g) The product gas, H2, is collected over water at a temperature of 20 °C and a pressure of 747 m ? The equilibrium constant #K_c# for the reaction #N_2(g)# + #3H_2(g)# #rightleftharpoons# #2NH_3(g)# at #450^oC# is 0.159. What is the equilibrium composition when 1 mol #N_2# is mixed with 3 mol #H_2# in a 2.00-L vessel? Thank you so much! What are the formulas of the following? a.sodium sulphide b.aluminiumoxide c.sodium chloroxide When acids and bases are mixed, no matter what the acid and base are, one product will always be constant, what is it? 100ml of 0.1 M HCl , 0.1 M KOH Were added till acid is 3/4 neutralized calculate concentration of salt formed? How mamy sigma and pi bonds are present in propene molecule ? Relation between molarity and molality?numerically WHat is a good hypothesis for density of air in a balloon? Complete combustion of C14H18O7 to CO2 and H2O. You have 315.0000 grams of C14H18O7. How many grams of O2 are required? How many grams of CO2 are generated? How many grams of H2O are generated? A 9.380 mol sample of nitrogen gas is maintained in a 0.8198 L container at 301.8 K. What is the pressure in atm calculated using the van der Waals' equation for N2 gas under these conditions? For N2, a = 1.390 L2atm/mol2 and b = 3.910×10-2 L/mol. __ atm Can someone help me with this problem The pressure on a gas at -73°C is doubled, but its volume is held constant. What will the final temperature be in degrees Celsius? Calculate molarity of a 20% w/w aqueous solution of sulphuric acid? Who proved j.j thomson incorrect with his cathode ray tube experiments? The value of Ksp for silver carbonate, Ag2CO3, is 8.10×10−12. Calculate the solubility of Ag2CO3 in grams per liter? What is the double replacement equation for Aluminum Hydroxide reacting with Hydrochloric Acid? At what temperature will a sugar solution boil? Ph=6. Ph=7. Ph=10. Ph=14 Which is acidic solution? What is the effect of pressure on solubility of gases in liquid? You have 10 grams of C10H10O2. How many moles are present? How many molecules are present? What are the chemical products for magnesium + dilute hydrochloric acid ? 1a state heisenberg uncertainty principle? 1b give the mathematical expression for this principle Need help balancing equation formulas? How many grams of oxygen are needed to burn 10.0 moles of C3H8? Please show all work!! A visible radiation has #6 xx 10^24# cycle/sec.Find out the wavelength for the radiation in nanometre? Why the molecular and empirical formula of sone compounds are same?explain What is the molecular formula of each compound if the empirical formula is CH and the actual molar mass of compound is 78 g/mole? Why do ionic compounds conduct electricity? Calcium carbonate is decomposed by heating, converting it to carbon dioxide gas and solid calcium oxide. How many liters of carbon dioxide will be produced at 1.05 atm and a temperature of 975°C for every 100. kg of calcium carbonate that is decomposed? What's the mass of HCl that will be produced from 655 kg of NaCl if the yield of the process is 84.5%? How is heat related to kinetic energy Like if we heat the particles, they gain kinetic energy... So,Why do the particles begin to vibrate and start their motion if we supply heat? When 44.01 mL of unknown alcohol (density=.789g/mL) is added to 50g water, it lowers freezing point of water from 0 to -30. Find molar mass (Kf=1.99)? How many grams of Na3PO4 (164g/mol) are needed to make 4.0 liters of an isotonic solution? Question on calculations about solubility How to calculate it ? I need two elements similar to each other but in different groups. any help? What is the change in temperature for #"30 mL"# of water that was heated with #"2450 J"# of thermal energy? Assume the specific heat capacity stays constant within this temperature range. Is this correct? How much heat did the calorimeter gain? Can some explain this using ice table?? Calculate #K_c# at this temperature. Provide your answer to two places after the decimal and without units. Can some explain this using ice table?? If #K_c# at this temperature is #0.877#, then in which direction (left or right) will the reaction shift to reach equilibrium? If a solution is neutral what is the [OH-]? A 30.0-mL volume of 0.50 M CH3COOH (Ka=1.8×10−5) was titrated with 0.50 M NaOH. Calculate the pH after addition of 30.0 mL of NaOH at 25 C. Calculate the PH? What is the mass of sodium sulfate in 675 mL of 0.025 M sodium sulfate? How to find volume if there is only mass given? Without density What is the #"pH"# of a solution with #["OH"^(-)] = 5.00 xx 10^(-3) "M"#? Calculate molarity of a solution containing 2.5g of NaCl in 100ml of solution? Give answer What is the reaction if one mixes 25g of lead (ii) nitrate with 25g of sodium chloride? At what temperature will 0.654 moles of neon gas occupy 12.30 liters at 1.95 atmospheres? How many molrs of Zn are required to produce 20g of ZnCl2? Imagine the 10.0g of ice has an initial temperature of -5.0degreesC. Can someone calculate the energy needed to heat the ice, melt it, and heat the water to 54.5degreesC? (Cp of ice=2.108J/gdegreesC) How do i calculate the limiting reactant given the following problem? In which state of matter are particles the strongest? What block of elements has the d sublevels being filled? How much energy is required to melt 10.0g of ice at its melting point? (Hf=334 J/g) What is the difference between an “open” system & a “closed” system? In the electron configuration of #"Br"#, where are the valence electrons? Are they in the #3d#? What is the frequency, wavenumber and photon energy of visible light with 598nm? How much energy is required to increase the temperature of an object with a mass of 1.5 g from 24 °C to 90 °C if its specific heat capacity is 4.2 J/(°C·g)? What volume of 2.995 mol/L HCl is required to react with 1.84 g of aluminium? If light with a wavelength of 504 nm and an irradiance of 1.18 kW/m^2 shine on a leaf with an area of 2.7 cm^2, how many photons strike the leaf each second? The substances X,Y and Z are added to three different containers containing water.? Consider the titration of 50.0 mL of 0.20 M NH3 (Kb=1.8×10−5) with 0.20 M HNO3. Calculate the pH after addition of 50.0 mL of the titrant at 25 C? How do you predict the product of a reaction? Positive ions formed when atoms? What is the hybridization of the central carbon atom in 2-propanol? How much heat is needed to raise temperature of 8g of water by 20*C ? An experiment calls for 5.50 L of sulfur dioxide at 0°C and 1.00 atm. What would the volume of this gas be at 30°C if the pressure remains constant? How many unpaired electrons are in chloroform? What is an electrolyte? Does carbon use all four valence electrons for bonding? What are "Loan Pairs"? How do valence electron configurations of the alkali metals compare with each other? What is understood by valence electrons? What chemical element has the symbol W? How do I get the pH of a solution from 1 to 2? Can non metal conduct electricity?if yes ,how?if no, why? Can you name some physical properties of sodium? What is the hybridization of PF5? What are the noble gases? The goal of basic science is? Question #c03da Question #b9efe Can copper oxide (CuO(s)) be reduced to copper (Cu(s)) with hydrogen(H2(g)) ? How do you determine the formula of a hydrate? How can I remember the first 18 elements in the Periodic Table? Question #8b941 Question #8fe41 How does pH affect titration? In a hurry to complete the experiment , Sipho did not allow all the magnesium to react . will his reported magnesium to oxygen ratio be given too high or to low? The work function () for a metal is 5.90×10-19 J. What is the longest wavelength of electromagnetic radiation that can eject an electron from the surface of a piece of the metal? What are allotropes? Question #da2e3 What is the wavelength of light that has a frequency of #6 * 10^14# #"Hz"# ? What is the value of Keq? The energy of electromagnetic waves? How do covalent bonds dissolve in water? Distinguish chemically, CH3CN & CH3CN? What do water and gold have in common? A gas tank holds 2785 l of propane, propane at 830 mm Hg. What is the volume of the propane at standard temperature? What is the purpose of the sientific method? How many valence electrons are in Xe2+? 0.1M Formic Acid solution is titrated against 0.1 M NaOH solution. What would be the difference in pH between 1/5 and 4/5 stages of neutralization of acid? A gas tank holds 95 L of propane at 470 mm Hg. What is the volume of the propane at standard pressure? Tartaric acid, H2C4H4O6 is neutralized with 0.100 M NaOH. A sample of 3.0 g of tartaric acid reacts with 45 mL of base. How concentrated is the base? How to prove that napthalene is a aromatic compound by using huckel's rule? What are some properties of alpha particles ? Question #edc17 Question #8ea9e Please help me on this too a) 9.80g of water vapor condenses on a soda can at 100.0°C. Given: latent heat of vaporization 2260 J/g latent heat of fusion 334 J/g (ii) Calculate the amount of energy transferred? Is #Ni(CO)_4# a complex compound? Why the value of atamic mass of carbon in periodic table is 12.011 a.m.u , not 12.00 a.m.u? #"ZnSO"_4 + "CuSO"_4 -> #? A mole of helium gas contains 6.02x10^23 helium atoms. how many helium atoms are there in a millimole of helium? in a kilomole? Question #2eafd Wat is the ratio between masses of carbon and oxygen in CO2?? Why hydrogen is collected by upward displacement.? What represents a solid solution? And it asks for the identities of the ingredients, (it is required) Calculate the molar mass of a gaseous if it was found that at 35centigrade and pressure of 860mmhg and density is 0.55g/l? What does the size of an ion mean? And why does it affect the strength of metallic bonding? Calculate the mass of zinc oxide that is obtained from decomposition of 9,95 g of zinc hydroxide . the yield of the reaction is 80%.? Why CsCl crystal gets the shape of NaCl after heating?? Why phenoxide is more stable than phenol? What would be the electron dot structure of a molecule of sulphur which is made up of eight atoms of sulphur? Is covalent compound and covalent bond the same thing? same thing with ionic bond.. is it ionic bonding or ionic compound? Write the molecular formula of a diatomic gas and a triatomic gas? Calculate the minimum energy ΔE = E2- E1 (eV and SI) required to excite a H -atom from ground state to its first excited state.boltman constant k= 1.38E-23JK-¹ calculate the ratio (E2 -E1)/kT when the gas is at 2000°C? A piston compresses 2.50 L of air at STP to a volume of 0.77 L. What is the final pressure of the air? What mass of acetic acid would be needed to completely use 12.2g of sodium bicarbonate? Complete combustion of C10H10O5 to CO2 and H2O. You have 132.4172 grams of C10H10O5 and 319.988 grams of O2. What is the limiting reagent? How many grams of CO2 are generated? How many grams of H20 are generated? If 23.5 moles of an ideal gas occupies 93.5 liters at 459 K, what is the pressure of the gas? Ideal Gas.how can find the moles of hydrogen gas if I do have 726.782 torr? Which ion has the most shells that contain electrons?? How many molecules (not moles) of NH3 are produced from 3.04×10−4 g of H2? How can there be 7 moles of reactants and just 5 moles of product? What state of matter have particles that move independently of one another with very little attraction? What is the relationship between the solubility and the temperature? How to explain it to a middle school student (my brother). A gas occupies a volume of 79.1 mL at 303 K and 96.66 kPa. What volume will it occupy at STP? How much heat is evolved when 907 kg of Ammonia is produced according to the following equation? (Assume that the reaction occurs at constant pressure) #N_2(g)# + #3H_2(g)# #rarr# #2NH_3(g)# ; #DeltaH# = -91.8 kJ Thank you so much! :) How do I do this? What is a full set of valence electrons? Except for helium Whats something containing a transition element from period 4? And identify the transition element How to write the complete nuclear reaction? Uranium 238 is unstable and spontaneously emits alpha particles Which of the following does not have a noble gas electron configuration? Whats an ionic substance and a covalent substance? And what label should i use to describe each substance it represents? Whats something thats malleable? How to determine precipitate in double displacement reaction ? What is a limiting reactant and theoretical yield? What is #""_(8)^(19) "O"^(2+)# protons, neutrons, and electrons? You are given 4 moles of O2, how many moles of H2O are produced? What is the mass of 0.357 mol of the element potassium (K)? A sample of 1.0 mol of gas is stored under a pressure of 10.0 atm and kept at a controlled temperature of 200 K. What volume of gas is in the sample? A sample of dry gas is found to occupy 2.850 L at 22.0°C and .918atm. How many moles of the gas are present? The work function (##) for a metal is #5.90*10^-19 J#. What is the longest wavelength of electromagnetic radiation that can eject an electron from the surface of a piece of the metal? The temperature of a gas is 37 degree census at what temperaturewould its original volume be halved while the pressure is quadrupled? What can help a chemical reaction get started? A. A flame B. Mixing materials C.Placing materials on a hot plate D. All of above What are the units of k in the following rate law? Rate = k[X] Calculate the percentage yield of the reaction? A teacher burns 1g of magnesium in oxygen. The magnesium oxide produced is found to have a mass of 2. 5g. Explain the difference in mass? How do to measure the solubility of a solid? If you have the following reaction: #"NO"_2(g) + "CO"(g) -> "NO" (g) + "CO"_2(g)# and the rate law is: rate = k[NO2] If the concentration of nitrogen dioxide doubles the rate of the reaction will ____________? What is the mass of three moles of oxygen atoms? A sample of helium at 27 centigrade occupies a volume of 120L and pressure of 700atm.calculate the new volume of temperature at 18 centigrade if the pressure was increased by 38atm? Thanks Calculate the volume of 3.00 moles of gas at 24.0 oC and 1 atm? If you have 6.02 x 10 ^23 molecules of water in a glass, how many moles do you have? •1 •2 •3 •4 Calculate the acidic ionization constant? How many moles of a gas would be present in a gas trapped within a 0.037 L vessel at 80.00 oC and a pressure of 2.5 atm? 100 cm^3 of 0.1 mol dm^-3 of sulfuric acid and 150 cm^3 of 0.15 mol dm^-3 of sodium hydroxide are mixed. (b) Calculate the amount of sodium hydroxide remaining at the end of the reaction? Factors that influence the Kinetic of an irreversible exothermic reaction... and temperature? If you boiled water at the top of a mountain, would you expect it to boil at 100 degrees Celsius and why? What is the pH value when 450 mL 0.07 M NaOH is mixed with 550 mL 0.05 M CH3COOH? (pKs=4.75) How did atomic theory change over time? How many psrticles are present in the nucleus? Give there Names, symbols and characteristics. Does atomic mass effect the boiling point of a matter? How to find no of covalent bonds in NH3 ? How many mL of a 2% solution will result from the dilution of 20mL of a 10% solution? The answer is 100, but I can't figure out. What is the smallest element in the second period? A gas has a pressure of 0.370 Kpa at 50.0 C and a volume of 142ml. How many moles of gas are there? If you react 30.0 grams of Al with 50.0 grams of Cl2, what is the theoretical yield of AlCl3? What is the limiting reagent? Topic:half-life decay 2.80moles of a radioactive element was originally present in a given sample of compound.if after 45.6moles of it remain,find the half life of this element? Which of the following 0.1 M aqueous solutions will exert high osmotic pressure ? a) Al2(SO4)3. b)Na2SO4. c) MgCl2. d) KCl Melting and boiling point of alkanes increases with increase in molar mass. why? Oxidation state for zinc? What is the charge on #Co# in #[Co(CN)_6]^(-3)#? What happens to the helium balloon kept in the refrigerator? Which law is suitable for this? Charles law or Boyle's law or grahams law of diffusion?? What is the volume of 4.1g N2 at STP? Identify the acid and the base on the left side and the conjugate acid and conjugate base on the right side.? Question #e5dac What mass of methane combusted? What will happen to the final volume if both absolute T and P are doubled? Question #df155 Are the attractions water molecules have for each other stronger or weaker than the attractions between molecules of carbon dioxide? Thank you! Electronic configuration of bromine ? The half-life of a substance is 100 years. What the rate of decay per annum, expressed as a percentage correct to 1 decimal place? If 42.5 mol of an ideal gas is at 8.77 atm and 439 K, what is the volume of the gas? Consider table salt (NaCl) and water (H2O) how could you increase the rate of the salt dissolving in the water? (i.e) how can you change how fast it dissolves? How is the equivalent weight of As2S3 related to its molecular weight in the following reaction : As2S3 + H+ + NO3- ------> NO + H2O + AsO4 3- + SO4 2- ?' What is the quantum number of last electron in chlorine? What type of bonding is present in compounds that can be electrolysed? If an ideal gas has a pressure of 3.21 atm, a temperature of 461 K, and has a volume of 87.07 L, how many moles of gas are in the sample? Which is the strongest reducing agent among #H_2O , H_2S , H_2Se , H_2Te#? Sea water contains roughly 28.0 g of Na Cl per liter. what is the molarity of sodium chloride in sea water? What is the mass of 5 moles of Fe2O3 ? What volume of oxyygen gas is present in 3.26 moles of oxygen gas at STP? C6H6+15O2-12CO2+6H2O+ 1562kcal if you want to obtain 125kcal of heat by reacting benzene with oxygen, how many grams of benzene must you use? How to balance Cl2 + MgBr2? What is the empirical formula and empirical formula mass for C9H27O9? What is the mass of 3.100 mol Ca(OH)2? Answer in units of g? 1.91 g H2 is allowed to react with 9.86 g N2, producing 1.74 g NH3. What is the percent yield for this reaction under the given conditions? Express your answer to three significant figures and include the appropriate units. When an equilibrium exists between the dissolved and the undissolved solute in a solution, the solution must be? Arrange the following molecules in order of increasing average molecular speed. All are at the same temperature. hydrogen, nitrogen dioxide, sulfur dioxide, nitrogen Enter formulas in the boxes below: 1 = slowest, 4 = fastest ? 1 2 3 4 Why do real gases deviate from ideal gas behaviour? What is the de Broglie wavelength of a person with a mass of 50 kg jogging at 5 m/s? True or false? During purification of copper, The impure copper serves as anode. Thanks A certain element exists in a face-centered cubic structure. The atomic radius of an atom of this element is 185 pm. What is the density of this element in g/cm3?(Assume the element has a molar mass of 70.9 g/mol.) The density of nickel (FCC unit cell) is 8.94 g/cc. at 20°C. What is the diameter of the atom ? (atomic weight = 59) Calculate the enthalpy change for the reaction.? What is the percent by mass of each element in #"N"_2"O"_3#? How many grams of aluminum oxide would form if 12.5 moles of aluminum burned? Describle what you would observe when a small piece of lithum is dropped onto surface of cold water?' How much energy is needed to change the temperature of 50.0 g of water 15.0°C ? Question #c53a6 A mixture of neon and argon gases exerts a total pressure of 2.39 atm. The partial pressure of the neon alone is 1.84 atm, what is the partial pressure of the argon? 5.5 mol of water means how much water ? Calculate the hydrogen ion concentration of the weak acid.? A baseball must weigh between 5.00 and 5.25 ounces (1 ounce= 28.3g). What is the wavelength of a 5.15 ounce baseball at 92mph? How does water affect the concentration of cyanide, caustic and peroxide? This question is about the rate of a chemical reaction between two reactants, one of which is in solutuion and one of which is solid? Find the pH.? Determine the concentration of the acid.? Difference between shape and structure of XeF4??? How to calculate n for molecular formula? What is the density of the irregular shape object if the mass is 100g? Is #"valence"# considered to be a chemical property? Question #28e8b Equation for lead sulphate+ ammonium hydroxide to give ammonium sulphate+ lead hydroxide? Which of the following solids is the best insulator? Magnesium, iron, gold, or magnesium fluoride? [MULTIPLE CHOICE QUESTION]: Carbon dioxide gas in most soluble in water under conditions of? True or false? Commercially, oxygen is prepared by fractional distillation of air. Thanks What is the direction of reaction when chlorine gas is added to an equilibrium mixture of #PCl_3+# #PCl_5+# and #Cl_2+#? The reaction is #PCl_3(g)# + #Cl_2(g)# #rightleftharpoons# #PCl_5(g)# Calculate the heat absorbed by 15 g of water to raise its temperature from #20^oC# to #50^oC# (at constant pressure)? The specific heat of water is #4.18J(g^oC)#. What color is observed when lithium is added to water? What is the wavelength of this light? The Half-Life Of A Certain Isotope Is 2 Hours.If The Original Mass of Isotope was 12,000 Grams,How Many Grams Would Be Left After 1 Day? How many hydrogen atoms are in 3.8 grammes of glucose? How do the chemical properties of the halogens compare to those of the noble gases? If light has a wavelength of 555 nm, what is the energy of this light expressed with units of kJ/mol? The mass of na which will contain 6.023*10^23atoms(na=23)calulate the following ? How many liters of Propane gas (C3H8) will undergo complete combustion with 34 liters of Oxygen gas? How many moles of Li2CO3 are produced from 88G of CO2 ? What kind of oils do alkali metals need to be stored under? True or false? Sulphur dioxide turns lime water milky. Thanks What is the empirical formula of a compound composed of 3.25% hydrogen (H), 19.36% carbon (C), and 77.39% oxygen (O) by mass? C8H18+O2=CO2+H20? Finding the mass? Calculate the equilibrium concentrations of reactant and products when 0.331 moles of PCl3 and 0.331 moles of Cl2 are introduced into a 1.00 L vessel at 500 K? If the temperature of a gas doubles, a. What happens to the kinetic energy of the molecules of the gas? b. What happens to the velocity of the molecules of the gas? What is the balanced equation for magnesium in sulphuric acid? Calculate the molarity of a nacl solution if 500 mL of the solution is made with 0.56 mol of nacl. What is the molarity? How many atoms of nitrogen are in 2.50 moles of NO2? What property of water is changed when you add rock salt? How many moles of C8H18 contain 9.25 x 10^24 molecules of C8H18? What is the percent composition of Magnesium(Mg) in the compound Magnesium Chloride (MgCl) ? What is the balanced equation for sulphuric acid in copper oxide? What experiments did Dalton do to develop his atomic theory? A sample of CO2 gas is at 3000 C. What is the average kinetic energy of the molecules? Find the average velocity of the CO2 molecules. When one mole of Al2S3 reacts with excess H2O, how many moles of Al(OH)3 and H2S will be produced? For the reaction, Ag2O(s)2Ags(s)+1/2O2(g);H,S and T are 40.63kJ/mol,108.8J/Kmol and 373.4K respectively. Predict the feasibility of reaction??? What is Kp? What is the change in the freezing point of water when 68.5 g of sucrose is dissolved in 500.0 g of water? Kf of water = -1.86°C/mol molar mass sucrose = 342.30 g/mol i value of sugar = 1 In a buffer solution both the concentration of HCN and NaCN is 0.02 What is the concentration of H+ and OH+ here? A student collects 450 mL of HCl gas at a pressure of 100 kPa and a temperature of 17oC. If he stores the gas at 5oC and compresses it to 250 mL, then what pressure will the gas be under? What is the value for Kc for the following reaction: PbCl2(s) Pb2+(aq) + 2 Cl-(aq), if PbCl2(s) = 1.50 grams, [Pb2+] = 1.6 × 10-2 M and [Cl-] = 3.2 × 10-2 M at equilibrium? (The molar mass of PbCl2(s) is 278 g/mol and its density is 5.85 g/cm3.) A container of gas at 33 psi is compressed to one seventh its original volume. What is the new pressure of the gas? Answer in units of psi A sample of neon (Ne) occupies 1700 mL at STP. At constant pressure, what temperature is necessary to increase the volume to 2100 mL? What's the effect of concentration on density for liquids? The empirical formula of a compound is CH2. Its molecular mass is 70 g mol what is its molecular formula? A sample of hydrogen gas has a volume of 65.0 mL at a pressure of 0.992 atm and a temperature of 16 oC. What volume will the hydrogen have at 0.984 atm and 25oC? How many atoms are in one dozen? How many atoms are in 1 mole? What’s the final temperature in Kelvin of 1.5 gallons of water, with an initial temperature of 50 Fahrenheit, if you add 432 kJ to the water? Why can we not disposal the ethanol in the drain? A 4.0 M solution of Mg(OH)2 is completely neutralized 160 mL of a 1.0 M solution of HCl. How many milliliters of magnesium hydroxide were required? Explain why the positions of cobalt and nickel do not appear to be reversed in periodic tables where the relative atomic masses are rounded to a whole number? Why don't insulators need a high specific heat? At what temperature would gas occupy 3L? Arrange the following molecules in order of increasing average molecular speed. H2 at 371K, NO2 at 339K, Ne at 371K, H2 at 425K Enter formulas and temperatures in the boxes below: 1 = slowest, 4 = fastest 1 at K 2 at K 3 at K 4 at K ??? What is the mol ratio of NaN3 to Na? A compound contains 49.98g of C and 10.47g of H. The molar mass of the compound was measured to be 58.12. What is the empirical formula for the material? What is the molecular formula? Fish do not grow well in warm water compared to cold water.WHY? A rigid container of O2 has a pressure of 340 kPa at a temperature of 713 K. What is the pressure at 273 K if the volume and number of moles has not changed? Consider the reaction when aqueous solutions of ammonium phosphate and lead(II) acetate are combined. What will the net ionic equation be? Specify if the states are (aq) or (s) Suppose that 20ml of 0.01M Mn 2+ is titrated with0.005M EDTA at a pH of 10.00.What is the concentration of uncomplexed Mn 2+ at the equivalence point? Log kf =13.87 Preparation of 7M HCl in 100ml? 3gm of salt of molecular weight30 is dissolved in 250gm of water . the molality of the solution is? What are criteria needed to declare molecule as, polar or non-polar? What is the oxidation number of NO and Fe in Na2[Fe(CN)6NO]? Determine the empirical formula of a compound found to contain 38.76%calcium , 19,97%phosphorus, and the remainder oxygen ? What is the formula for copper (IV) oxide? What are saturated and unsaturated hydrocarbons? Is CnHn×2+2 is applicable to all hydro carbons or only petrochemicals. Please answer so that a 9 standard student could understand How much Zinc chloride in grams will be produced when 6.54 grams of zinc (FW=65.4 g/mol) reacts with 3.65 grams of HCl (FW=36.5 g/mol)? Which reactant is the limiting reactant I'm currently trying to complete a lab report of finding out the concentration of glucose in a honey sample using a chemical and enzymatic assay. I'm currently trying to work out what to plot the graph as, absorance against glucose %/concentration/uL? Could you please help me with this problem? thank you!! I get that in the first shell there are 2 electrons and then 8 in the next, but when can an atom have more that 8 electrons in its shells? When one mole of Al2S3 reacts with excess H2O, how many moles of Al(OH)3 and H3S will be produced? It an atom emits an alpha particle the atomic number of that will ___ by 2 and the mass number will drop by __ Explain why this happens? I'm quite comfused with the empirical formula regarding in finding its ratio. For example, the answers for the ratio are 2.68, 4.83 and 8.92. Will I multiply it to a certain number or round it up to get the answer? Thanks in advance For the quantum number #l = 1#, how many possible values are there for the quantum number #m_l#? Write an equation to show the nature of boric acid in aqueous medium? When one mole of H2(g) reacts with one mole of O2(g), how many moles of H2O will be produced? Why is CuI2 unstable? H+ ion Concentration of water doesn't change by adding - a. CH3COONa b. NaNO3 c. NaCN d. Na2CO3. Which one is the correct option? What is the dissociation reaction of sodium acetate in water? Is boyle's law valid at very temperature? Is a single property,such as density,sufficient enough to always correctly identify a substance? A solution s prepared by mixing 1.00 g ethanol with 100.0 g water to give final volume 101 mL. What is molarity, mass %, mole fraction and molality of ethanol in solution? An electron of energy 10.8 ev is incident on an H atom then? Will silver oxidize copper? Will magnesium oxidize zinc? Determine how many moles of each of the following compounds will react with 0.1mols of HCL 1KCI 2.Mg(OH)2 3.LiOH 4NaCI 5.AI(OH)3 ? Why can the removal of an electron from an atom and addition of an oxygen to an atom both be considered oxidations? How can you have a polar bond but not a polar molecule? What do you get when you react propionic/propanoic acid with ammonium hydroxide? How many protons, neutrons, and electrons are in Amethyst? #2Al + 3Cl_2 to 2AlCl_3# If 15.2 g of aluminum reacts with 39.1g of chlorine, how many g of AlCl3 forms? (2 decimal places) What's the Net Ionic equation of H3PO4(aq)+NaOH(aq)->NaH2PO4(aq)+H2O(l) ? Na + Cl2 --> 2 NaCl If 15 mol Na reacts with 15 mol Cl2 , _____ is the limiting reactant and ____ is the excess reactant. Cl2, Na They run out at the same time Na, Cl2 ? What is the formula for iron (IV) oxide? Sodium hydroxide is added to a solution with a pH of two and thymol blue indicator. Describe the color of the solution at the following pH values: 4, 7, 10, and 13? What effect do polarity and intermolecular forces on the macroscopic world? Chemistry help? You have two separate, clear aqueous solutions—one contains CH3F (fluoromethane) and the other contains CaF2 (calcium fluoride). Classify each solution as an electrolyte or nonelectrolyte. Both solutions are clear, so how could you tell the difference? Balancing equations? What is the boiling point of sugar solution at atmospheric pressure ? How do we calculate boiling point elevation of sugar solution How many grams of oxygen gas are needed to produce 36.0 grams of water ? The specific heat of water is 4.184 J/g times celsius degree. How much heat is required to raise the temperature of 5.0g of water by 3.0 C degrees? For the reaction 2 A + B ---> Products, the following initial rate data was collected? [A] [B] Initial Rate 0.01 M 0.01 M 0.002 M/sec 0.03 M 0.02 M 0.0024 M/sec 0.03 M 0.01 M 0.006 M/sec Calculate the mass of phosphoric acid that can be obtained from 28.4 g of diphosphorus pent oxide. the yield of the reaction is 80%.? Can you help with this Chemistry question? Changing word equations into formulas and balancing them? If you have 4.5 moles of iron (III) oxide, how many moles of carbon dioxide ? Help! With my solution to this Equilibrium problem. Please help me solve the quadratic for this problem and Are my written steps correct? What mass of hydrogen burned will produce 1414kJ of thermal energy? Sodium reaction with Iodine(1) chloride.What is equation?my answer was 2Na+2ICl2NaCl+I2.But it is incorrect.Correct answer is 2Na+ICl NaCl+NaI How? How many atoms of carbon are in 1.225 moles? 3. Below is the decay curve for bismuth-210. What is the half-life for the radioisotope? What percent of the isotope remains after 20 days? How many half-life periods have passed after 25 days? How many days would pass while 32 grams decayed to 8 grams? Please Check My Answer for an ICE Table with correct sig figs? How does reactivity changes on moving down in goup 17? A given mass of hydrogen occupies 20.0 L at 600 torr. What volume will it occupy at 1.50 atm? Question #44b23 What does Ethyne+sodamide gives? How do you write an equation for the alpha decay of Actinium-218? What is calibration curve? Dihydrogen does noy act as a reducing agent why? How many grams of CaCl2 would you use to make 500 ml of a 6mM calcium salt solution? CaCl2=110 What volume of water must be added to 30ml of alcohol to obtain a 40%(by volume)by mass of salt solution? The molality of a 2% by weight of aqueous solution of H2SO4 is? Explain de Broglies's hypothesis? How much aluminum oxide is needed to produce 1.000 kg of aluminum? What is the balance equation of potassium nitrate(KNO3) TO SUGAR (C12H22O11)? What is order of reaction h2+cl2=2hcl? He rate of effusion of Ne gas through a porous barrier is observed to be 8.45x10 to the negative 4th mol/h. Under the same conditions, the rate of effusion of NH3gas would be ? mol/h. 18 grams of glucose contains? a)0.6 atoms of carbon b)0.6 molecules of hydrogen c)0.6 gram molecules of co2 d)1.2 gram atom of hydrogen Question #6cbbb Excess Ca(OH)2 is shaken with water to produce a saturated solution. The solution is filtered, and a 60.00 mL sample titrated with HCl requires 11.13 mL of 9.83×10−2 M HCl to reach the endpoint. calculate ksp for Ca(OH)2? How many inches are there in a 2-story building? What is the dissociation reaction of acetic acid in water? How to identify the parent acid and parent base in a salt? How is an element's outer electron configuration related to its position in the periodic table? Define the oxidation number of sulphur in Na2S2O3 55.04% chlorine . Find the empirical formulae and molecular formular if the molar mass is 128g/mol. (C =12, H=1,cl=35.5) ? Question #306b8 An unknown alkane (not a cycloalkane) yielded 12.1g of CO2 and 5.4g of H2O when combusted in excess oxygen. What is the molecular formula for the alkane? What is the formula for iron(III) cyanide ? What is the volume of 0.4 grams O2 atom??? For the reaction of nitric oxide, NO with chlorine, #Cl_2#: #2NO(g)# + #Cl_2(g)# #rarr# #2NOCl(g)# The observed rate law is R = k#[NO]^2# # [Cl_2]# a) What is the reaction order with respect to nitric oxide? with respect to chlorine? and the overall order? The pressure on a gas is 2 atmospheres. What will be the new pressure if the temperature and the volume both double? balanced chemical equation for ? #"Ni(NO"_3)_2 +"NaCO"_3"##rarr##"NaNO"_3 + "NiCO"_3"# True or false? Electrolysis is used for electroplating metallic articles. Thanks A gas at a temperature of 3000 C and pressure of 2 atmospheres has a volume of 2 m3 How many moles of the gas are there? How many molecules of the gas are there? Is there any lone pair electrons in sp2 hybridization?and how does these lone pair electrons change the look of a molecule? Hydrogen gas (2.02 g/mol) can be produced from the reaction of methane (16.05 g/mol) and water vapor (18.02 g/mol) according to the following reaction equation: CH4(g)+H2O(g)->CO(g)+3 H2(g) If 210 g CH4 react with excess H2O at 560 K and 0.926 atm? Why Cu does not reacts with HCl? Q: Some data for the kinetic energy of ejected electrons as a function of the wavelength of the incident radiation for the photoelectron effect? with the relation between wavelength and KE in a graph. How many grams of potassium bromide are produced from 42.9g of aluminum bromide ? How do you complete and balance this chemical reaction? (I can't figure it out...) - Something reacts to yield aqueous aluminum nitrate and solid lead (II) chloride This question is about calorimeter constant. Does the lower the calorimeter constant mean the better the heat retainment? You have 1.45 Moles of Hydrogen. How many atoms are present? Compute the root-mean-square speed of H2 molecules in a sample of hydrogen gas at a temperature of 94°C. m s-1 ? How would you prepare 300 mL of 0.750 M KCl? What are amino acids? How can an amino acid act as buffer Convert 13 grams of nh3 to particles? If one started will 5.59 g of copper (II) chloride, how many grams of copper could be produced? please and thank you. If you can show math so i can learn from it that would be great too. Write a balanced nuclear equation for the beta decay of gold-211. Include atomic number, mass number, and symbol for each element. Explain your work? Could someone please correct my answer to the Equilibrium reaction question? Why is cyclo octatetraene non-aromatic?Please give a detailed explanation? Does this reaction favor the products, reactants or neither? Predict the products in the neutralization reaction of hydrogen iodide, HI, with calcium hydroxide, Ca(OH)2. Write a balanced equation. Identify and explain the parts of the reaction? Calculate the change in the number of moles of each gas from the start of a reaction until reaching equilibrium? Does a precipitate form when a solution of potassium sulfide and a solution of calcium chloride are mixed together? If so, what is the net ionic reaction? Using standard electrode potentials in a consistent manner? How would I predict what the products would be for this chemical equation & balance it? What is photoelectric effect? How many moles of solute particles are in 1L of 0.25M glucose? Type the number? 4. Scientists found a rock with 20 g of radioactive element X and 80 g of radioactive element Y. After about 31 years, the mass of both element X and element Y decreased to 10 g. What are the half-lives of these elements? Why mercury is in liquid state while it is metal? What volume, in milliliters, of 0.530 M Ca(OH)2 is needed to completely neutralize 276 mL of a 0.220 M HI solution? Draw the Lewis dot structures for the neutral atoms and ions of helium, boron, and oxygen.? Bismuth-209 (209Bi) was bombarded with another element to produce meitnerium-266 (266Mt) and one neutron. What was the bombarding particle? Show your balanced nuclear equation as work? What is the Molarity of 2.8g of Potassium Hydroxide in 250cm^3 of solution? What will produce and happen to the color if I add more NaOH in CaCl2 and ZnCl2? If you have a 20% glucose solution, what is the molar concentration? Glucose=180 Can anyone please explain me in details about what are the assumptions made for the derivation of Schrödinger Wave Equation? Ethylene oxide, #C_2H_4O# decomposes when heated to give methane and carbon monoxide according to the reaction: #C_2H_4O_(g)# #rarr# #CH_4(g)# + #CO_(g)#. The following kinetic data were observed for the reaction at 688 K. (data below?) When NaBr(s) is added to a solution of CuSO4 and water, what color should it change? Why would AgBr(s) not produce a color change in the same solution? Classifying reactions? Balancing equations help? Hydrogen sulfide is oxidized by chlorine in aqueous solution. H2S(aq) + Cl2(aq)?> S(s) + 2HCl(aq) The experimental rate law is Rate = k[H2S][Cl2] ? A reaction has the following rate law: Rate = k[A]2[B][C] ? PLease Help! Me to calculate the correct answer with correct Sig Figs for this Kc problem? Calculate the no of moles,molecules and atom present in 250 gm of calcium carbonate? In a chemical reaction 0.096g of boron combines with 0.144g of oxygen to form a compound . Calculate the mass of compound formed ? What is index of hydrogen deficiency? What is its formula? Do batteries change the way they work by temperature? Will it work when the batteries are heated, cooled, or room temperature? (C2H4)n burns in the presence of air gives? What is the balanced equation for the production of oxygen gas and potassium chloride from the decomposition of potassium chloride? Why volume of nitrogen dioxide reduces when nitrogen monoxide reacts with oxygen? A sample of gas has a volume of 350.0ml at 27.0 Celsius the gas is heated at constant pressure until the volume is 500.0ml what is the final temperature of the gas in degrees Celsius? Litmus paper or solution is -------- type of indicator ? Why hydrogen is easily displaced by metal from acid? How many grams of sodium acetate are produced from 700 mL HCl? Relate the rate of decomposition of #NO_2# to the rate of formation of #O_2# for the following reaction? #2NO_2(g)# #rarr# #2NO_(g)# + #O_2# Can zinc sulphate be converted to zinc nitrate in a single step conversion? How many milliliters of a 0.140 M KCl solution are needed to provide 0.0115 mol KCl? Find the number of atom present in PO4 -3 ions ? Question #a339b Air trapped in a cylinder fitted with a piston occupies 145.7 mL at 1.08 atm pressure . What is the new volume of air when the pressure is increased to 1.43 atm by applying force to the piston? Why do you think bottles of chemicals usually have both their chemical name and their formula on the label ? Is combustion enthalpy change always negative? A. What is the concentration of 1 mole of sodium hydroxide in 250 mL of water? If a liquids vapour pressure is 101.325kpa at 383k what is its boiling point? What will bhi oxidation stae of Mnso4 and how? What is the complete electron configuration of copper(I) ion? Which of the following are physical properties and which are chemical properties? Color Hardness Ability to react with acids Ability to react with oxygen Flammability Malleability Ductility If 3.45 g of KNO3 reacts with sufficient sulfur (S8) and carbon (C), how much P-V work will the gases do against an external pressure of 1.00 atm given the densities of nitrogen and carbon dioxide are 1.165 g/L and 1.830 g/L, respectively, at 20°C? How many molecules are contained in 1.30 mol O2? Calculate the density of methane at 0°C and 1atmospheric pressure? Does the fact that ethanol has a lower polarity than water limit what dissolves into it as a solvent? What is ionisation energy? In Cu2+ reacting with I-, why is CuI formed instead of CuI2? Limiting Reactions plz help? Why does boiling saltwater remove salt from water? Mcq When zinc poweder is added to acetic acid ? A.the mixture becomes warm B.a gas is evolved C.the colour of mixture becomes yellow D.a solid settles at the bottom Correct the errors in the following? a) #1s^2 2s^3 2p^7# b) #1s^2 2s^2 3p^6 3s^2 3d^8# c) #1s^3 2s^2 2p^6 3s^2 3p^5 4s^1# d) #1s^1 2s^2 2p^6 3s^2 3p^6 3d^7# What is the density of a substance with a mass of 31.38 grams and a volume of 20.11 ml? What mass of al2o3 is formed when 412 grams of fe3o4 reacts by single replacement with using 199 grams of aluminium ? Please help How many grams are there in 7.8x1019 atoms of Beryllium (Be)? A #"100.00-mL"# solution containing #"0.500 M"# #"NH"_3# and #"0.500 M"# #"NH"_4^+# (#"pK"_a = 9.26#) had #"NaOH"# added to it, and increased to a #"pH"# of #10.26#. If #"20.45 mL"# of #"NaOH"# was added, what was its molarity at the time of addition? Describe a test for oxygen? If 146.5g of chromium(III) chlorate decomposes what mass of oxygen can be produced? Molar Volume of a gas? the options are: 1) 22.41 L/mol 2) use molar mass of gas 3) cannot calculate molar volume of gas 4) 6.022 x 10^23 According to the ideal gas law, a 0.9766 mol sample of carbon dioxide gas in a 1.295 L container at 270.0 K should exert a pressure of 16.71 atm. By what percent does the pressure calculated using the van der Waals' equation differ from the ideal ? How many atoms of sodium (Na) are in 2.5 mol of sodium? Question #d2776 Help! With Kc and Equilibrium? Hi, i have a question. Sodium Fluoride is added drinking water. A 25-L sample of city water contains 0.018 g NaF. Express this concentration in molarity?. Calculate, using Hess' Law, the enthalpy change for the ionisation of ethanoic acid? What is evaporator? Calculate Ksp for Ca(OH)2? A certain radio station broadcasts radio waves which are about 136 inches long, each. There are 2.54 cm in one inch. Convert the wavelength to meters? What is the total electric charge on molecules and compounds ? If you have 2.0 grams of SO2 available to react with oxygen, how many grams of SO3 can be produced in the following reaction? 2SO2+O2 -> 2SO3 What does the arrowed bond of nitrogen with oxygen means? Why is the chloride ion not bonded to the pyridinium ion in pyridinium chloride? A solution of alcohol contains 40 ml of acetone in 460 ml of water . calculate the concentration of the solution? How many moles of O2 are required to react completely with 14.8 moles of AL? 4AL -> 2AL2O3 What is the mass of 4 moles of C3H8? What is a mole? Determine the type of bonding is formed between sodium and oxygen? Question #55755 Why solid has definite shape? Chemistry Help: balanced chemical equation? Flourine gas at 200 k has a pressure of 150 atm is cooled to100 K. What is the new pressure ? What is the formula mass of CuSo4? Consider the following balanced equation. 2N2H4(g)+N2O4(g)Õ3N2(g)+4H2O(g) ? How do we prepare Sulphuric acid from Hydrochloric acid? How many grams of oxygen can be produced if you have 5.0 grams of KCLO3 in the following reaction? 2KCLO3 -> 2KCL + 3O2 3.3 grams of CO react with oxygen to produce carbon dioxide. write AND balance the equation for this reaction. then calculate how many grams of carbon dioxide can be produced. so what is it? How to make lead(II) nitrate from lead(II) sulfate? What should you use to test if a type of food has starch, sugar or fat? Iodine is not soluble in water. Name two solvents that more iodine be dissolved? What do you mean by isotones ? What is the empirical formula of a compound comprised of 1.75% hydrogen, 56.1% sulfur and 42.15% oxygen? Calculate the density of CH4 at 0°C and 1 atmospheric pressure? A gas occupy a certain volume at stp what will be it's temperature if it's volume increase 3 times annd pressure is half? Convert 345 moles of H20 to molecules? Question #66fb0 What happened to the agua oxigenada when manganese dioxide is pour to it? At what interface does the water vapor drop to zero? In molecular shape, How do I know which atoms to make lone pairs (when drawing based off of stucture with no lone pairs; lewis structure)? Do I take away the ones in the middle part first or the top/ bottom atoms..? How many grams are there in 7.8x1019 atoms of Beryllium (Be)? How many moles of nitrite ion in 6.31*10^-1 moles of Ni(NO2)2? If 2s1 given how to find n,l,ml? What will be the product of weak acid and weak base?acud aor basic or neutral? During the middle ages, alchemists searched unsuccessfully for a way to "transmute" or change one element into another, most notably lead into gold. Was copper transmuted into silver in this experiment? Why or why not? You have 18g of Be for a sample of Beryllium Chloride. How many moles of Be are present? Help! what's ionization and electronegativity? Determine the molarity of 2.50 moles NaCl in 1.00 L solution? Describe one similarity and one difference between an Isotope and Half-Life? How many moles are there in 30 grams of copper (Cu)? How do you find effective nuclear charge in each shell of an atom? (general chem) How much tin (Sn) is in 3620 atoms of tin? Answer in units of mol. How many moles are 1.20 x 1025 aloms of phosphorous? Please explain the nomenclature of coordination compounds?? Question #37918 What is the concentration in molarity of S2O32- (aq) in a solution prepared by mixing 300 mL of 0.162 M Na2S2O3 (aq) with enough 0.126 M KCl (aq) to make a 350.0 mL solution? (Assume volumes are additive and that no chemical reactions take place.) What is a good, simple definition for standard enthalpy change? Standard enthalpy of formation? And entropy? What about delta S and delta G? Write the state of hybridization of carbon in following compounds and shapes of each of the molecules (a) CH3Cl (b) HCONH2 ? Use Trouton’s rule to estimate the standard enthalpy of vaporization of liquid bromine, which boils at #59.8^@ "C"#? Which is the solvent and solute? A solution is prepared by mixing 5.000 g of water with 23.66 g of t-butanol (C8H10O) to give a final solution of 37.46 L. What is the mole fraction of Nacl in a mixture containing 7.21 moles Nacl, 9.37 moles KCI, and 3.42 moles LiCl? How mant grams are in 1.25x 10^24 atoms of calcium? Calculate the number of molecules of CH4 in 48g CH4? How much heat energy is absorbed when 88.0 g of water is heated from 5C to 37C? C6h12o6 -> 2c2h5oh + 2co2 How many moles of co2 are produced when 0.250 mol of glucose react in this fashion? Mention the state of hybridization of central atom? 1.SF6 What are the nodal planes in #3d_(x^2-y^2)# orbital? If a flea weights 0.103 cg what is it’s weight in nanograms? Can you use calcium hydroxide instead of sodium hydroxide? Suppose log's mass is 6.3k.g. after burning the mass of the ash is 1.6k.g explain what might have happened to the other 4.7k.g? Which of the following processes requires more heat energy? Raising the temp. of 100.g of water by 10.0 degrees c or Raising the temp. of 100.g of aluminum by 10.0 degrees c? Write in complete sentences. How does the de-broglie wavelength of charged particle change when accelerating potential increases? Determine the specific heat of unknown metal from the fact that 6.40 * 10-2kj are needed to raise the temperature of 15g of unknown metal from 22 degrees Celsius to 33 degrees Celsius? How many grams are in #2.3 xx 10^4color(white)(l)"mol"# of calcium phosphate, Ca3(PO4)2? Balanced chemical equation 2C8H18(g)+25O2(g)Õ16CO2(g)+18H2O(g) How many moles of water are produced in this reaction? Express answer with the appropriate units. After the reaction, how much octane is left? Express answer with the appropriate units. Calculate the mass of oxygen gas required to react with 7.0 grams zinc sulfide to produce zinc oxide and sulfur oxide? What is the number of moles of iron atoms in 19.2 grams of iron (II) oxide? What is the importance of mass number in the periodic table ? How many atoms are in 45.6 grams of aluminum? If the solubility of a solute is S, find its percentage by weight? Burning Sodium is a ---------oxidisation process? How can we account for the color change of the solution? What is the relation between photoelectric current and the intensity of the photon provided? How many sub shells are there with principal quantum number n=6? Between the configurations 4p1 and 4p2,which one is more stable? Two element showing properties of both metal as well as non metal ? Why butane has only two isomers?It can has more possible isomers? 25. A buffer is prepared by mixing picric acid and its conjugate base in a 2:1 ratio. The pH of the solution is measured as 0.079. What is the Ka of picric acid? This question is using the concept Law of multiple proportions, how cn I use that law to solve this problem? Question #056cc How many grams of sodium will produce 4.80 grams of hydrogen gas in #2"Na"+2"H"_2"O"->2"NaOH"+"H"_2#? What is the name of the compound #CH_3CH_2S(CH_3)_2# and How does the following reaction happen? When solid Pb metal is put into an aqueous solution of Cu(NO3)2, solid Cu metal and a solution of Pb(NO3)2 result. Write the net ionic equation for the reaction.? Oxidation number of P in H2PO2? Question #fff7b What proof did Rutherford have that showed that the positive charge of an atom was in the middle? What is the density of copper if 45 g of copper has a volume of 5.0 mL? What is the % v/v of an aqueous solution made by dissolving 40.0 ml of ethanol and diluting to a final volume of 270.0 ml? 0.10 moles of glycerol is dissolved in 1.20 kg of benzene. What is the change in freezing point given that benzene has a freezing point depression coefficient of -5.065 K kg mol-1? (Answer to two decimal places) Without computing the actual value of the entropy change, predict its sign for the following reactions. Begin by balancing the equation for each, paying close attention to the phases that are stable at T = 298K and 1.00 bar of pressure? Why the melting and boiling point of helium is lower than krypton? (4marks) Why can combination and decomposition reactions be considered the reverse of each other? How do I Discuss evaporation using kinetic theory of gases? If you use 100 g of glucose in 0.5 L of H2O, what molar concentration is the sugar solution? glucose=180 How many orbitals are in a sub shell with l equal to (a) 0; (b) 2; (c)1; (d)3? Will the molality of the solution be affected by temperature? Give reason. 1 mark question. What is the molality of a solution composed of 285 g of acetone ((CH3)2CO) dissolved in 383 g of water? If you have 2.0 grams of SO2 available to react with oxygen, how many grams of SO3 can be produced in the following reaction? 2SO2-> 2SO3 Question #806f2 Which of the following are physical changes and which are chemical changes? Rotting Food Fermenting Charcoal Burns in a Grill Decaying Plant Cutting Vegetables Melting Butter Any Tips for Balancing Equations? I am having trouble? N2H4+N2o4-----> N2 + 4h20 Whqt are Cyclic and acyclic isomers of C3H6O? Which molecule possess which type of wander walls attraction forces how i know ? How many valence electrons do you need to complete the octect rule of nitrogen? What is the freezing point of a 50% by volume ethanol solution? Assume water is the solvent. (Use data from Table 12.7 in textbook -for your reference, the text is ‘Chemistry a Molecular Approach’ by Tro et al). How many electrons does it take to fill all molecular orbitals formed from the 1s orbitals of 2 atoms? Question dealing with pseudo-first order reaction? What is an atom? Discuss the differences between ionic and molecular solution? The temperature at which a substance changes from a gas to liquid is called? In a solution consisting of 10.81g of Na2SO4 and 800g of H2O, which is the solute? Type the name of the compound or molecule? What are the advantages &disadvantages of spiral periodic table over rectangular periodic table? Consider the reaction when aqueous solutions of sodium sulfide and potassium carbonate are combined. What will the net ionic equation be? Specify if the states are (aq) or (s) Help Me Please! Equilibrium Constants and Kc? Which of the following correctly matches an effect of temperature, pressure or volume on the solubility of O2 at 20oC and 1atm? a. Decreasing temperature decreases solubility. b. Increasing temperature decreases solubility. c. Decreasing volume decreases If 31.0g of magnesium hydroxide area available to react with KCl how many grams of KCl are required? In lab you will be preparing five aqeous solutions of glycerine (C3H8O3), each a different predetermined %(m/m) and each to a total mass of 30 g. How many grams of deionized water should you measure to make your 20 %(m/m) solution for lab? Mass of 1.50 mol of carbon tetrafluoride? In the reaction Zn+2HClÕZnCl2+H2 How many Zn atoms will be formed, if the volume of H2 is 5,6 litres? What is the formula for barium acetate? Which balanced equation represents ammonia? What is responsible for the monatomic state of noble gases? A piece of copper wire is placed in a solution of nitric acid. 1. Write the balanced net ionic equation. 2.Which species is reduced in this reaction? What elements is the element H2o made out of? and with simple answers please. Question #ed352 How many moles are in 965.5g of the zinc ? What is the balanced chemical equation for Aluminium nitrate + sodium hydroxide to form aluminium hydrixide + sodium nitrate ? Question #35731 What are the products of the decomposition of FeCO3? If density of methanol is 0.793kg/L , what is its volume needed for making 2.5L of its 0.25M solution? You have 1.6 x 1024 atoms of Bismuth. How many moles are present? Examine this equation and answer the questions that follow: 2Al + Fe2O3 Õ Al2O3 + 2Fe How many grams of Fe can be produced when 10.0g of Al is reacted with an excess (unlimited) supply of Fe2O3? 3.9 g of CO2 is produced from how many liters of C3H8 ? I can't solve it T.T please help meh what is the freezing point and boiling point of 50% by mass/weight of sugar syrup C12H22O11? Write down the name and symbol of the particle formed when the oxygen atom gains two electrons? PLEASE HELP! If the presence of 2.00g of an unknown non-ionizing substance lowers the freezing temperature of a 10.00g sample of benzene by 6.33 degrees celsius, calculate the molar mass of the substance? Caffeine (C8H10N4O2) can kiil you if you consume as much as 1.55x1022 molucules (60 gallons of Mcdonalds coffee). How many grams is this? Find the total number of atoms in a sample of cocaine hydrochloride, C17H22ClNO4, of mass 24.0 mg ? How many grams of oxygen are needed to produce .60 liters of carbon dioxide at stp? Determine the temperature of a 25.0g sample of neon gas that exerts a pressure of 0.922 atm and has a volume of 3.25L? Concentrated nitric acid has a density of 1.51 g/cm3 and is 87.5% by mass HNO3. What is the molarity of the acid? Why is the electronic configuration of atomic chromium considered to be unusual? Will the molality of the solution be affected by temperature give resin? Question #cb6d7 An atom of helium contains two protons,two electron and two neutrons. Indicate the possible ways of arrangement of these particles in the helium atom? If dihydrogen gas is collected over water, when #P_(SVP)=15.5*mm*Hg#, and #"atmospheric pressure"-=740*mm*Hg#, what is #P_(H_2)# in units of #"atmospheres"#? Describe why there is a different between the formulae of both ionic salt i.e NaCl and MgCl? Why is dry ice sprinkled on clouds to make rain? Describe a test for hydrogen? In a 1.0M solution of Ca(NO3)2 how many mole of NO3-ions are present? How to convert decimal into ordinary number in amotic masses? I still dont get the concept of bonding in polyatomic ions and compound? Plants convert 1.15x1017 grams of carbon into sugar (C6H12O6) each year. How many molecules of sugar is this? Why does sodium metal give a blue colour when added to liquid ammonia? What other colours are observed in this reaction? The pressure in an automobile tire is 198 kPa at 25°C. At the end of a trip on a hot sunny day, the pressure has risen to 225 kPa. What is the temperature of the air in the tire? (Assume that volume and number of moles has not changed.) Test to distinguish between ZnSO4 and ZnSO3? What is the empirical formula for a compound which contains 80.2 g zinc and 19.8 g oxygen ? How do I calculate mole fraction of glucose in a solution? True or false? Aluminum is the third most abundant metal in the earth's crust. Thanks Do polycrystalline solids have short range order? What creates the negative charge that forms around a nucleus of an atom? True or false? Aquaregia is a mixture of hydrochloric acid and sulphuric acid. Thanks The number of cl atoms in ch2cl2 is 3.67 ×10^24 .Calculate the number of moles of molecules ? Why does straight and long chain butane has greater boiling point than branched and short chain 2-methyl propane with the same number of electrons? Which aqueous solution has the lower freezing point, 0.1 m CaCl2 or 0.1 m glucose? Type the name of the formula unit or molecule? How many moles of Fe2O3 are in 193 g of the compound? why [CuCl4]2- has a flattened tetrahedral structure, not regular tetrahedron and [CoCl4]2- is tetrahedron? What is the concentration of the 60L solution with 15g of solute? Boron has an atomic mass of 10.81 amu according to the periodic table However, no single atom of boron has a mass or 10.81 amu. How can you explain this difference? The density of liquid mercury is 13.53 g/cm^3. The density of copper is 8.96 g/cm^3. Would you expect a piece of copper to sink or float when placed in a container of liquid mercury? What mass of carbon dioxide is produced from the complete combustion of 2.60×10−3 g of methane? Express your answer with the appropriate units. 8 grams of barium carbonate (BaCO3) is needed to kill a rat. How many molecules is this? How do you find Polarity? How do you explain evaporation using kinetic theory of gases? Write the expression for the rate of formation of the products and the rate of consumption of the reactants for the reaction HO(g) -> H2(g) + O2(g) How would you write this? How much heat, in kilojoules, must be lost by 155 grams of steam at 125 degrees celsius to convert steam to water and then cool the water to 20.0 degree celsius? The combustion of meson produces carbon dioxide and water. assume that 52. 0g burned in the presence of excess air. What is the percentage yield if the reaction produces 87 g Of CO2? Consider the reaction when aqueous solutions of calcium nitrate and potassium hydroxide are combined.? What is the vapor pressure of a solution of 44.0 g of glycerol (C3H8O3) in 500.0 g of water at 25oC? The vapor pressure of water at 25oC is 23.76 torr. Glycerol can be considered a dilute, non-volatile solvent which is behaving ideally.Type the number? Water inside a tub rises from 15 mL to 19 mL when an object is submerged. If the mass of the object is 24g, what's the density of the object? 8 grams of barium carbonate #("BaCO"_3")# is needed to kill a rat. How many molecules is this? What is the flux used in the extraction of cast iron from hamatite ore? Atmospheric pressure on the surface of mars is about 6.0mmHg. the partial pressure of carbon dioxide(CO2) is 5.7mmHg. what percent of the Martian atmosphere is CO2? Planck's quantum theory.explain? Hello, Can someone please explain why AlCl3 a solid? I thought Cl is soluble except when paired with Ag, Pb, and Hg. I would appreciate any help. Thank you! Al(s) + 3Cl(g) -> AlCl3(s) How many molecules of ozone (O3) would be needed to fill 5.4 x1019 gram hole in the atmosphere? What are the answers for this questions? Hi I need help with my chemistry problem. You have 50 ml of a drink with 100 mg/liter of vitamin c. How many ml of iodine solution (5% w/v) do you need to react with the vitamin c in the sample? Thank you so much for your help Karen What do you call an element that has the same number of protons & neutrons? (Basically, the opposite of an isotope) How can chemists state with certainty that there will be no discovery of a new element between sulfur and chlorine? Who do you calculate the %RSD ? calculate the %RSD to the correct number of sig. digits. to the correct number of sig. digits. 10.025, 10.025, 10.115, 10.251, 10.215, 10.151, 10.115 Na will be more stable if it has the electron structure of which noble gas? Consider the reaction when aqueous solutions of lead(II) acetate and chromium(III) bromide are combined. The net ionic equation for this reaction is:? I need help? . metals react with acids to give hydrogen gas and salts. Write the equations for the reactions of magnesium and aluminum with hydrochloric acid.? Consider the reaction when aqueous solutions of barium nitrate and potassium sulfate are combined.? What is the solvent of gold? Question #5b102 A gas at 155 kPa and 25°C occupies a container with an initial volume of 1.00 L. By changing the volume, the pressure of the gas increases to 605 kPa as the temperature is raised to 125°C. What is the new volume if the number of moles is constant? Which of the following are isotopes of the sulphur? 1=16p+16n 2=16n+17n 3=19p+16n 4=16p+17n What volume in litre of HCl produced if 10L Cl_2 reacted with 20L H_2. H_2+Cl_2Õ2HCl ? a)10 b)20 c)30 d)15 Question #68932 What is the half equation for silver? When a weather balloon is inflated to a volume of 25.8 L at a pressure of 732 mmHg and a temperature of 24.6 C . The balloon rises in the atmosphere to an altitude where the pressure is 390. mmHg and the temperature is -14.2 C ? How many moles are in 9.8 grams of calcium? How many neutrons are there in #""_6^12"C"^(4-)#? A wooden fossil has a c-14 activity of 6.3 beta particles/min/gram of carbon.calculate the age of the fossil if half life of carbon is 5760 yrs? How in the world do I write these expressions for Kc? If 283g KClO3 react, how many grams of O2 will be produced? Define bohr's atomic theory? I calculated the partial pressure to be 16.1 - and it was wrong? How can i make 20 ppm solution of Hcl from a stock solution that is 0.500m? How would I work out the concentration of 0.2uL of glucose in 0.8uL in water? What mass of aluminium chloride can be obtained when 48g of aluminium is completely reacted with dilute hydrochloric acid? Question #36757 Does oxygen 2- have 8 Valence electrons or 6 Valence electrons? Question #851e9 Question #0966e Elements combine with wach other. Give reason. What is the answer of the above question? 13 moles of chlorine to chlorine atoms? Why do atoms undergo ionisation what is the purpose? If 23.0 grams of magnesium is burned in an atmosphere containing excess oxygen gas, how many grams of the magnesium oxide will be formed? Equation: 2Mg+O2--->2MgO Predict if precipitation will occur when the following pair of solutions are mixed. What would the chemical equation be? 1. KNO3(aq) and MgCl2(aq) 2. NaOH(aq) and Fe(NO3)3 (aq) What mass of H2O is formed when H2 reacts with 384 g of 02? What is the total number of subatomic particles (protons,neutrons, and electrons) in the empirical formula Na2SO4? When aqueous solutions of potassium carbonate and cobalt(II) bromide are combined, solid cobalt(II) carbonate and a solution of potassium bromide are formed. The net ionic equation for this reaction is:? are they gas, solid, liquid, or aq? Which is solute and solvent? Chemistry question over buffers? Determine the volume occupied by 0.285 moles of a gas at 15°C if the pressure is 81.8 kPa? There are 5.4 million atoms of bees on a bee ranch, how many moles of bees are there? How many grams of glucose would you use to make a 2M solution in 1 L? Glucose=180 How many moles of KOH are there in 1.673x1023 molecules oh KOH? Calculate the pH of the solution of #10^(-6)# M #NaOH# at #50^o#C? How many molecules of glucose are present in 1.53 grams of glucose? The melting point of RbBr is 955 K while that of NaF is 1260 K.... (1) Melting point of NaF is much larger that that of RbBr...why?(it is mainly due to.. .) What is the concentration of #[OH^-]# in a solution of 0,025 M NH3? What is the equilibrium concentration of #"HCl"#? What is formed as a possible explanation to a scientific question that has yet to be tested? What is the molarity of a solution made by dissolving 4.88 g of KCl in 423 mL of solution? What is the concentration of solution in ppm if 0.02g of na3po4 dissolvein 1000ml of water? How to separate flour and iron fillings? 2.5 g of a chemical compound containing C,H and N is burned with excess oxygen and 6.78 g of CO2, 1.94 g of H20 and N2 are obtained. Determine the empirical and molecular formula of this compound when its molecular mass is 81 g / mol? Explain how you know a chemical reaction occurred between the two solutions, calcium chloride and sodium sulfate? What are amino acids? How can an amino acid act as buffer Percentage of nitrogen in magnesium nitrade is? How one reaction happens? What is the process to write any reaction? Why does the H in HCl move to a molecule of NH3? It doesn’t seem to make sense as both of the molecules are satisfied, right? Do bases conduct electricity ? A sample of gas has a volume of 12 L and a pressure of 1.0 atm. If the pressure of gas is increased to 2.0 atm, what is the new volume of the gas? Temperature and moles are constant. How many moles of solute particles are in 1L of 0.50M glucose? Type the number? As at higher altitudes the boiling point decreases bcx vapour pressure decreases but why it does take more time to cook food over there as the b.p is already decreased so it would be easy to reach that temp easily? What is the chemical formula of ionic compound for CaF2? What is the chemical formula of ionic compound for NaF? Question #c07af Question #26202 The temperature of a 4.00 L sample of gas is changed from 10°C to 20°C. What will the volume of this gas be if the pressure and number of moles are constant? Question #b5f73 Why does one mole of zinc does not have a volume of 24 dm3 at room temperature and pressure? How many atoms are there in 2.0 mole of Si? Explain the effect of acids on methyl orange and litmus paper? What is the freezing point of a solution of 0.111 m urea in water? Kf for water is 1.86oC m-1. Type the number. For a chemical reaction the activation energy for the forward reaction is +155kJ, and the backward reaction is +171kJ. What is the overall energy for the forward reaction? How many years will it take for 88.0 grams of tritium to decay to an 11.0 gram sample? (The half-life of tritium is 12.3 years.) What is a universal solvent? In writing the formula of a compound with a polyatomic ion, the formula of the polyatomic ion must be enclosed within parentheses if the subscript of the polyatomic ion is greater than one Therefore the formula of the compound made up of Al3+ Sulfate is? How many grams of solute are needed to prepare each of the following solutions? Question #e3807 Write the net ionic equation for the precipitation of silver iodide from aqueous solution:? Are all biofuels a mixture, hence use #kJg^-1#and fossil fuels a pure substance? Oxidation no. Of O in KCLO3? How many molecules of Carbon Dioxide are there in 0.50 mole of Carbon Dioxide? What is the compound form of KNO3(aq) and MgCl2(aq)? Which element forms an ionic bond with flurorine? Use the enthalpy of combustion of propene CH2= CHCH3(g), #Delta#HCo =-2058 kJ mol-1, and the fact that #Delta#Hfo[H2O(l)] = -285.83 kJ mol-1, and #Delta#Hfo[CO2(g)] -393.51 kJ mol-1, to find its enthalpy of formation? Why are single bonds length longer than double and triple bonds? Why are triple bonds the strongest? A sample of argon gas occupies a volume of 400.0ml at a temperature of 90.0 Celsius and a pressure of 735 torr how many moles of argon are present? What is the molar concentration of a sugar solution made of 50 g glucose in a total volume of 1L? How many air molecules are present at room temperature (27°C), and 1 atm pressure? An unknown sugar is found to have a molar mass of 180.18 g/mol. The sugar contains: 40 grams of C, 6.7 grams of H, and 53.3 grams of O.what isthe molecular formula? Identify the element with the electron in outer substance? Properties of nanoparticles? Can someone please give me a procedure to make Carbon Dioxide gas as well as the materials needed to do so? please please please What is the proper isotopic notation for a +3 ion of an atom? A 400 mL sample of oxygen is cooled from 0°C to -40°C. What is the new volume of oxygen? (Assume that the pressure and number of moles has not changed.) Explain how #4"Ca"_3("PO"_4)_2# contains #52# total atoms? Can someone please help me with Equilibrium? The filling of which orbital is represented by the transition metals in period 4? Question #77d57 Which is true about the effusion rates of helium and sulphur dioxide when the molar mass of helium is 4 grams/mole and the molar mass of sulphur dioxide is 64 grams? If 1.87 g of acetic acid (CH3CO2H) reacts with 2.31 g of isopentyl alcohol (C5H12O) to give 2.64 g of isopentyl acetate (C7H14O2), what is the percent yield of the reaction? How many moles of nitrogen are needed to completely react with two moles of hydrogen? The weak acid is represented by? Choose one: the gray and green spheres the gray and purple spheres the gray and yellow spheres What is definition and formula of 'molal specific volume' ? What is the freezing point of a solution of 155 g LiCl in 575 g H20? Question #95561 Question #56df0 What is the wavelength of the emitted light when excited electrons in the hydrogen atoms make transition from the n = 3 in the Balmer series? Classify the following salts as either acidic basic or neutral? NaBr , Na2CO3 , CaOHCL , BaSO4 , NH4CL , CaCO3 , and KHSO4: At what temperature is water the most dense? Why is this the case with water, but not other substances? Why KMnO4 in alkaline solution accept 3e per Mn and act as mild oxidizing agent while in acidic solution can gain 5 electron per Mn act as strong oxidizing agen??? The electrical conductivity of silicon increases by replacing a fraction of silicon atoms by arsenic atoms. Why? A hydrogen atom transitions from #n_i = 1# to #n_f = 7#. What needed to happen to cause this change? Which states did the atom start and end in? What is the change in energy? Which is a chemical property of hydrogen? Complete and balance the following equation ? a.KOH + HBr --> b. Ba(OH)2 + H2SO4 --> c.Ca(OH)2 + HNO3 --> heat d. Cu(OH)2 --> heat e. Fe( OH)3 --> Calculating the molarity of a solution? Consider the reaction when aqueous solutions of cobalt(II) bromide and iron(III) nitrate are combined. The net ionic equation for this reaction is: ? Question #42234 What is the equation of reaction between magnesium nitrate and ammonium hydrogen phosphate?? Question #5f58a What is the formula for sodium perchlorate? Is this correct? Zinc + Hydrocloric Acid = Hydrogen + Zinc chlorite (salt). How do I solve this problem? "vinegar is a 5% solution by volume of acetic acid. a 100 ml sample contains what volume of concentrated acid and what volume of water? show work." How do I solve this? A generic salt, AB3, has a molar mass of 297 g/mol and a solubility of 7.30 g/L at 25 °C. What is the Ksp of this salt at 25 °C? AB3(s) <--> A^(3+) + 3B^(-) Why is water such an excellent solvent? How Can Bonding And Antibonding Electron Can Be Identified In 2p Orbital? A gas having NA (6.02*10^23)atoms with diatomic nature.Find the volume in dm3 occupied by the gas? a)11.2 b)22.4 c)7.46 d)5.60 How does the solubility of a salt vary with temperature? How many moles of hydrogen gas will be evolved when 6.5g of granulated zinc is dipped in excess of hcl? How do I find the molar solubility of this compound? The Ksp of cerium (III) iodate, Ce(IO3)3, is 1.40 × 10-11. Why will no salt form in the reaction between AgCl and HNO3? Ionic equation between copper carbonate and sulphuric acid question is that whether copper carbonate dissociates into its ions or not.According to me,it does not but in some papers I have seen that it dissociated into CO^-2 3.Explain? What subatomic particles mainly contribute to the mass of the entire atom? The real photo of an atom? Please, could you help me with this chemistry question?. Calculate the number of miles of magnesium,chlorine, and oxygen atoms in 3.40 moles of magnesium perchlorate, Mg(ClO4)2? Initial weights of ethanol ether acetone chloroform are taken as 10ml,after removing the stopers they evaporate, so what will be their final weights? Question #a7f46 Calculate the POH of a solution made by mixing 50 ml of 0.01 M #Ba(OH)_2# solution with 50 ml water? How to find the volume of the gas? Question #85523 Which is more concentrated a 50ml vinegar with 1 stick of chalk, 50ml vinegar with 2 sticks of chalk or 100ml vinegar with 1 stick of chalk? Calculate the relative atomic mass of calcium if the average mass of a calcium atom is 40 times greater than the mass of a carbon-13atom? What may happen when Na2SO4 is hydrolysis? Why is ionic bond non directional? What is an ionic bond? Gas mass 41.2cm3 in temperature 45C calculate the same volume in temperature 20C in the pressure is constant? Hydrogen gas is not evolved when metals react with nitric acid.Give reason? Is combustion physical and chemical process??? Question #91ceb Question #e139d What is the oxidation no of water? What are the factors affecting the dissolving rate of a solid? A solution is labelled 2.89ppm and is made with a solute that has moles in an equal to 5.22g/mL. What is molarity in solution? Question #7d789 Find no of molecules of S4 of 16g of sulphur powder? (S=32u) Two example of Co-otdinate bond compound? How many Valence Electronso are there in nitrogen? How many Valence Electrons are there in Argon? Is it necessary to use lithium aluminum hydride in reduction of nascent hydrogen? If measurement value of the instrument is not calibrated, will it affect the measurement? How many oxygen molecules will be produced from the decomposition of 18.4g of water? Conjugate Acid and conjugate Base for the reaction NH3 + H2O _ Nh4+ + OH- is what? Question #ce008 What will happen if we drop a few drop off an phenolepthaline in in sodium acetate solution? Through multiple reactions, a chemist uses C, CaO, HCl, and H2O to produce dichlorobenzene, C4H4Cl2. Assuming that the efficiency of this lab is a minimum of 65.0%, how many molecules of dichlorobenzene could be produced in the lab from 0.500 kg of C? Question #05ab5 Question #80f49 Chemical equation of methane? Atom of an element has 9 electrons 9 protons and 10 neutrons what is atomic no.? A steel cylinder contains N2, O2 and CO2 gases the total pressure in a tank is 3.00 ATM the partial pressure of the N2 and O2 are 950 torr in 1025 torr respectively what is the partial pressure of CO2 in atm within the mixture? Question #5ea7d 6-10. What are the name of the following compounds? a. Ca(OH)2 b. Fe(OH)2 c. Zn(OH)2 . Explain the effect of acids on methyl orange and litmus paper? How many grams of S were used? What is the freezing point of S in degrees C? What is the mass of 10cm³ of oil? Question #a1b58 . How are the acids classified according to number of hydrogen atoms? The pressure within a 2.25L balloon is 1.10 ATM if the volume of the balloon increases to 7.05 L what will be the final pressure (in ATM) within the balloon if the temperature does not change? Chemistry question about weak acids? A #36%# #"m/m"# solution of #"hydrochloric acid"# has #rho_"density"=1.19*g#. What is #[HCl(aq)]#? Part A: What mass of carbon dioxide is produced from the complete combustion of 2.60×10−3 g of methane? Express your answer with the appropriate units. Chemistry question over acids? Calculate the molar mass of the artificial sweetener? What is the rate of reaction in terms of the appearance of product C between time = 0 s and time = 20 s? Calculate the mass of zinc oxide that is obtained from decomposition of 9,95 g of zinc hydroxide . the yield of the reaction is 80%.? How many moles of H2SO4 are need to produce 13 moles of H2O? Use the definition of ΔU to find the molar change in internal energy for the formation of urea? Write out the electron configuration for neutral bromine. Draw the Lewis dot structure. Which depiction allows for better understanding of electrons involved in bonding? Explain your reasoning. What is an easy step-by-step process to memorize all variations of Stoichiometry (mole to mole, mole to gram, gram to mole, gram to gram?) Compute #hatP^2# and is #hatP# idempotent? How to calculate the number of protons in 1.00 g of #C_60#? You need to make a #1# #mu"M"# solution from a 1.0 M stock solution. If you start with 1.0 mL of the stock solution: (a) How much solvent is needed to make a solution with the needed concentration in one dilution. (b) How much solvent will be needed? which non metal can conduct electricity in solid state? The rubbing alcohol used to clean test tubes is 70% isopropanol, C3H8O, by volume. 100 mL of solution contains 54.95 g of isopropanol and 29.95 g of water. The vapor pressure of water is 20 degrees celsius is .0230 atm and the vapor pressure...? How many isomeric alkyne on hydrogenation gives 3,3-Dimethyhexane? Question #f242d What is the difference between strong and weak acids? Give three examples for each group. Write the net ionic equation for the precipitation of silver iodide from aqueous solution:? How do the aqueous solutions of molten ionic compunds conduxt electricity? What is the atomic weight of c12? Do sodium chloride and iodine form sublimation? How can i know the roman numeral for radical? Question #c2d91 Question #59298 Question #9e6ff Flexible plastic container with 0.86 g of 19.2 L helium gas. If you remove 0.205 grams of helium gas in continuous pressure and temperature, what is the new size? Calculate the number of carbon atoms present in 0.012g of C-12? What is the difference between isotopes and isobars? Question #4b02e The mass of the mixture containing calcium carbonate and calcium hydroxide decreased after burning to 60% of the initial value. How to calculate the mass ratio of CaCO3 and Ca(OH)2 in the pre-burning mixture? It will repeat in periodic table with regular intervals ? Calculate the volume that 4.5 kg(4500 g) of ethylene gas (C2H4) will occupy at STP? What is the Theoretical pH of 0.10 grams of sodium acetate with a volume of 10.0mL? #2NH3 rightleftharpoons (NH_4)^+ + (NH_2)^-#. #(NH_2)^-# acts as? Which compound is both paramagnetic and colored.? 82. When 233.1 g of ethylene (C2H4) burns in oxygen to give carbon dioxide and water, how many grams of CO2 are formed? A) 731.4 g B) 365.7 g C) 182.9 g D) 8.31 g E) 299.4 g Calculate the molarity of a solution containing KCl and water whose osmotic pressure at 38.0°C is 125 torr. Assume complete dissociation of the salt? Which of the following substances has only one type of atom? A. Water B. Salt C. Sand D. Oxygen How many moles of potassium chlorate were necessary to produce eight moles of oxygen? Question #bd736 Question #d7f6b Can someone please please please give me a procedure to make Carbon Dioxide gas as well as the materials needed to do so? please please please Twenty kilograms of sugar solution has a concentration of 30% sugar (by mass). How much water must be added to dilute it to a 10 % solution? What is the attraction that holds two covalently bonded atoms together? PLEASE Help! with Reactants decreasing in Molarity? If 0,5kg of dextrose is dissolved in 600ml of water to produce a solution with a final volumeof 1000ml what is the percentage w/w strength of the solution? Question #66902 Question #46611 Question #9daf5 The half life of a radioactive isotope is 4 years. Starting with 5 gram of a sample of this isotope, how much would remain after 10 years? What is an Atom? Can you please help answer this? Solid lead (II) iodide forms when aqueous solutions of potassium iodide and lead (II) nitrate are mixed. Write the molecular equation and include state symbols. Question #17fe5 Consider the reaction when aqueous solutions of silver(I) nitrate and barium bromide are combined. The net ionic equation for this reaction is:? You want to purchase a salt to melt snow and ice on your sidewalk. Which one of the following salts would best accomplish your task using the least amount (to reach same freezing point): NaCl or CaCl2? Question #6d5a2 Twenty kilograms of sugar solution has a concentration of 30% sugar (by mass). How much water must be added to dilute it to a 10 % solution? 1.91 g H2 is allowed to react with 9.86 g N2, producing 1.74 g NH3. What is the theoretical yield in grams for this reaction under the given conditions? Express your answer to three significant figures and include the appropriate units. What is the molality of NaCl in a 500 ml 20% aqueous NaCl solution whose density is 1.148 g/mL at 25C? An ideal solution is formed from mixing six grams of the nonvolatile solute urea, CH4N2O, with 32 grams of methanol, CH3OH. The vapor pressure of pure methanol at 20 degrees celsius is 89 mmHg...? Question #f67de One soluble 18.0% ammonium sulfate has a density of 1.10 g / mL. a) How many grams (NH4)2SO4 are needed to prepare 275 mL of this solution? b)How much mL of this solution are found im 90.0 g of ammonium sulfate? Question #16c59 Question #1be2d Question #6c522 The mass of 0.25 moles of methane? Question #d7e1c Does a proton neutron or electron have a charge of +1? To make #102*g# of alumina, how many grams of oxygen gas are necessary? Question #9e873 Is Bicarbonate and hydrogenCarbonate the same? Question #cc296 Question #e6b2c C2H5OH (l) + CH3COOH (l) Ö CH3COOC2H5 (l) +H2O(l) is the equation given, I am trying to find Kc? Which of the following substances has only one type of atom? A. Water B. Salt C. Sand D. Oxygen How many molecules magnesium are in 88.1 moles of magnesium? Question #65d2a Question #9e218 Question #b716d Question #89162 Where in the body are polar convalent bonds found? How to prepare sulphate ion 1000ppm solution in 1 liter? Calculate the heat in joules required to convert 20.0 g of ice to water at 0.0 degree Celsius? Then heat it to 10.0 degree Celsius. The heat of fusion of water is 334J/g and the SH capacity of water is 4.148J/g degree Celsius Question #9c686 Elemental S reacts with O2 to form SO3 according to the reaction 2S+3O2Õ2SO3 Part A: How many O2 molecules are needed to react with 6.67 g of S? Express your answer numerically in units of molecules. Solve using Charles's Law. A gas occupies the volume of 4.2L at 0.877 atm and 29°C. At what temperature is the volume of the gas 7.5L if the pressure kept constant? Question #973a5 How many grams of NO2 are produced when you have 4.44 grams of NO in the following reaction? 2NO-> 2NO2 Whats the oxidation state of the S in Li2S2O3? What mass of melamine, C3N3(NH2)3, will be obtained from 112.5 kg of urea, CO(NH2)2, if the yield of the overall reaction is 85.0 % ? Express your answer to three significant figures and include the appropriate units. Question #2a8f5 Question #6ef3e How many moles of ammonia are produced from the reaction of four moles of hydrogen? I have 370 grams of paraformaldeyhde and i want to make a 37% formaldeyhde solution out of this amount ?. Question #1929e Question #17571 Question #ef43b The half life of iron-59 is 44.5 days. After 133.5 days, 2.76 g of iron-59 remains. What was the mass of the original sample? Question #c7554 A first-order reaction has rate constants of 1.5 5 10-2 s-1 and 7.8 5 10-2 s-1 at 0°C and 20.°C, respectively. What is the value of the activation energy? What is selectivity? Is there any effect of selectivity in the halogenation reaction? How are the acids classified according to number of hydrogen atoms? What are the equilibrium concentrations of all species in a solution that initially contains only 2.0 mol/L #"FeSCN"^"2+"#? #2"AgNO"_(3"(aq)") + ("NH"_4)_2"Cr"_2"O"_(7"(aq)")-> 2"NH"_4"NO"_(3"(aq)") + "Ag"_2"Cr"_2"O"_(7"(s)") # Find the ionic equation of formation of silver dichromate ? You have 25ml of acetic acid (CH3COOH) density=1.058g/ml How many grams do you have? How many mol do you have? How many molecules do you have? Help please 2L of 2.3%wt salt water to 5%wt salt water from how much 25%wt salt water? Question #94351 Question #9d69b What is the definition of an acid according to Arrhenius? Question #aab71 Question #f1a6d Question #7860d Need some help in memorizing Crystal systems, can any body help? :( Out of 0.1 molal aqueous solution of glucose and sodium chloride respectively. Which one will have high boiling point? How is percentage abundance of a particular isotope determined? You have a sample of Methane (CH4) with as mass of 32g. How much of that sample is Hydrogen? Question #9e1e5 What is the concentration (in ppm) of a 500.0ml sample of drinking water that contains 1.5g of fluoride? Question #15240 Question #eee0b Question #ca318 How many atoms of sulfur are in 2.4 moles of sulfur? When CH3COONa is added to aq. solution of CH3COOH, the pH value increase or decrease? Question #67f85 If the concentration of potassium chloride is low during electrolysis, why is oxygen produced at the anode instead of chlorine? Question #5273e Question #2c911 How much heat is required to completely melt a 19.5 gram sample of ice at 0 degrees Celsius? Based on the table given below, why there is a difference in these observations?? Question #1ba6d Question #ce688 Question #95f69 Question #c9ca0 Question #445c9 Question #bfaee Question #371a4 Question #6a4a1 How many grams of oxygen are produced if you have 10.0 grams of water available for the following reaction? 2H2)-> 2H2 + O2 Salicylic acid has a Ka of 1.1 x 10^-3. Calculate the ratio of the concentration of salicylic acid and its sodium salt in a solution that has a pH of 2.50? Question #3537b Question #35f1d Please solve this chemistry question? What is the compound for Strontium Chlorite? Chemistry calculation help? Why does dish soap flow slower than vegetable oil? In lasik eye treatment which rays are used of electromagnetic waves? A sample of NaCl weighing 0.2286g is dissolved in H2O and exactly 50.0mL of silver nitrate solution is added to precipitate AgCl. The excess Ag+ is titrated with 12.55mL of 0.0986N solution of KSCN. What is the normality of the AgNO3 solution? Will Pu4+ (0.5 M) be reduced to Pu3+ (0.0005 M) by 0.25 M ascorbic acid under 1 M acid conditions at 25 degrees C? (5/5) Pu4+ + e- Pu3+ E° = 1.006 V Dehydroascorbic acid + 2H+ + 2e- ascorbic acid + H2O E° = 0.390 V Question #20567 Question #3224a Question #34f74 Question #93356 Question #a667e Chemistry question over pH? Question #c2681 An electron will have highest energy in which set ? A. 3,2,1,1/2 B. 4,2,-1,1/2 C. 4,1,0,-1/2 D. 5,0,0,1/2 Calculate the concentration at equilibrium? Question #4996b Help with Kinetics 2 Step Reactions? As halogens are salt formers ,so can we say alkylhalides are salts? Why do the noble gases have zero electron affinity? Question #7275d What is the structure of secondary butylchloride? Question #277cb Why does neutralisation of any strong acid in an aqueous solution by a strong base always result in a heat of reaction approx. -57kJ/mol? Question #09491 0.1M Formic Acid solution is titrated against 0.1 M NaOH solution.What would be the difference in pH between 1/5 and 4/5 stages of neutralization of acid? Question #efe74 Question #3a42b Question #15010 Question #f6c35 Question #6de53 Question #8a3ec Question #bf000 Question #43704 Question #710c5 Why can you say in: HCl + H2O -> Cl- + H3O, that the moles of HCl is equal to moles of H30+? Why silica crucible is used instead sintered crucible in gravimetric analysis for barium as barium sulphate? How many moles of tin atoms are there in 250 grams of tin? Unknown solution of CH3COOH of 20mL is titrated against a solution of 0.031 mol L^-1 NaOH. 10mL of the base solution is required to reach the equivalence point. Calculate to concentration of the CH3COOH solution? How much calcium carbonate do I need to produce 50mL carbon dioxide? 2HCl + CaCO3 -> CaCl2 + H2O + CO2 Question #54466 Question #946c6 Question #a286d Question #b34ea Question #82fc8 Question #f54d4 Question #47ede How many grams of Ca does 32 grams of O2 (oxygen)have to react to give 72 grams of CaO? Answer is given 40 grams but if 32 grams of oxygen has to react then it means that there are two oxygen atoms and then the formula will be CaO2 In a reaction A -> B with Delta G < 0, why is there equilibrium instead of going to completion? What's the greatest? 1 atm, 1 Torr, 1 mmHg, 1 kPa Question #11a64 Question #e1d16 How #H_2SO4+NaOH# could be #Na_2SO4+H_2O# and how to balance it? Question #66c6d Question #5e2ed What type of reaction is acetone with hypochlorite and why? Question #e5fb5 Question #67db3 Question #9b1a4 Water-displacement method? Question #f292e Question #d4e64 Question #4ac83 Question #a6414 When the volume of a gas is changed from 250 mL to 425 mL, the temperature will change from 137° C. What is temperature 2? Using Charles law Question #4d7ed Question #92a74 Help! What is a multi-step mechanism? Please help me to solve this? Which is the Lewis acid...#BF_3# or #NH_3#? Question #b8da5 Calculate the heat change in joules required to convert 500.0 g of steam to water at 100.0 degree Celsius and indicate whether heat was absorbed or released? The heat vaporization water is 2260J/g. Calculate the empirical formula? 0.6g of magnesium burns to give 0.95g magnesium oxide. Question #7e3cb Question #ce5df Question #c8b12 Question #af0ae Why is thermite process used? Question #c7673 What sort of molecule is methane? How many atoms in each element? A room kept at STP is filled with ozone, #O_3# contains a total of #5.41 xx 10^58# atoms of oxygen. What is the volume (in liters) of the room? What is the most reactive element? Let's say you calculate the electronegativity difference between N and Cl, based on where that value falls on the Bonding Spectrum Scale, how could you predict whether the bond would be ionic, polar covalent, or non-polar covalent? Question #8e2ef Question #8b170 A student measures out 45.62g of sodium chloride on a laboratory scale. How much mole of sodium chloride have they weighed ? Question #2caa2 Question #50cd3 Question #985e1 Is there a chemical formula for polyester. If there what is it? If a compound having four carbon atoms has a tripe bond in it. How many hydrogen atoms are there in it. AS: H3C-CH2-C --- (triple bond)CH What is the name of the compound? please explain the way you found that out. How can we identify ethane from ethene? Question #7c664 How many grams of CS2 are needed to produce 6 moles of sulfur dioxide? CS2+O2-->CO2+SO2 C4H10=C×2×2+H×4×2+2.What is this known as and please explain it? What are the correct number of electrons, protons and neutrons respectively in #"O"^(2-)"# ion of the isotope #"O"#? An object with a mass of #157*g# displaces a volume of #412*cm^3#. Will this object float? How do you turn KMnO4 (aq) + H2C2O4 (aq) into a molecular equation, then break it down through decomposition? Question #37f4a Given that one peanut contains 220 of niacin and there are a hundred peanuts in a cup how many cups of peanuts do you need to ingest the RDA of niacin? Question #ab9f8 In which of the following organic molecules might we expect hydrogen bonding to occur? benzoic acid (C6H5CO2H) acetone (2-propanone) N,N-dimethylacetamide [CH3CON(CH3)2, an amide formed from acetic acid and dimethylamine] methyl acetate, CH3CO2CH3 Question #209c3 What is the average KE of N2 at 1 atm and 298K? Is ammonium chloride in water a physical reaction? C3H8 + 5O2 = 3CO2 +4H2O, How much propane is needed to react with 6.2 moles of oxygen? The rate constant is numerically the same for 3 reaction of first second and third order respectively the unit of concentration being in mole per litre which reaction should be the fastest? Question #a63fc Question #3d579 Question #7f9f2 What is the IUPAC name of this.? Question #feca0 How do dry cleaning solvents relate to solubility? An unknown Cu solution was prepared by dissolving 3.1373 g of the sample in a 200.0 mL flask. A 25.00 mL aliquot of this solution was titrated with 0.1084 M Na2S2O4, the titration required 15.93 mL to reach the end point. Calculate the % Cu in the sample? Question #5ee15 Question #86802 Molarity of 4% (W/V) NaOH would be ?? Question #7e979 Question #8f8a6 Question #461b3 The position of a neutron in nucleus is known within an uncertainty of #5 xx 10^(-15) "m"#. At what speeds might we expect to find it moving? Question #86cde How many cyclic isomers does C5H10 have? A student attempted to dissolve a liquid ionic solute in a nonpolar solvent. The resulting mixture showed three distinct layers...? In the synthesis of aspirin: Why acetic anhydride is used instead of acetic acid? How many molecules of water (H2O) are there in 3.50 moles of water (H2O)? Why is there a discrepancy in the force constants of #"HBr"# vs. #"HCl"#? Given #N_2(g) + 3H_2(g) rarr 2NH_3(g)#, how many moles of hydrogen gas are required for the synthesis of #4*mol# of ammonia? What are bonding and anti-bonding molecular orbitals ? Question #dbcbd Using the Pka' Values for glutamic acid (pk1= 2.19, pk2= 9.67, pkR= 4.25) indicate the ionic form which predominates at: a) pH 1.0 b)pH 7.0 c) pH13 d) What is the net charge of the predominant form at each of these pH's? How much energy (in joules) is required to raise the temperature of 200g of liquid water from 20c to 50 c? Question #2c8f3 Help me to solve this question please? How does heating hydrated copper(II) sulfate illustrate the Law of Conservation of Mass? Question #89478 Why can you have atomic mass not as a whole number for example chlorine= 35.5? Question #a8628 Question #031c7 Commercially produced sulphuric acid is 96.4% by mass and it's specific gravity is 1.84.calculate the molarity of the sulphuric acid soltn? Question #7c143 Question #e112b Question #abc5b What mass of silver nitrate is necessary to prepare a #0.100*mol*L^-1# solution from #100*mL# of water? Question #3f715 Question #13b36 Question #1bcd7 Question #f3210 Question #05de2 Question #4a1de Question #40687 How to name an organic compound if it has #-CH_2OH# as a substituent? Question #503b6 Question #e0a35 Question #e0977 In the synthesis of aspirin: Why the the reagents have to be dry? What is the difference between ethanol and ethanoic acid based on physical and chemical properties? When you heat a hydrated substance what is driven off through the process of evaporation? Question #edc86 What's the pH of a solution of #1.5M HNO_3#? Question #ee3a7 Conductivity of 0.001M acetic acid at a certain temperature is 5.07×10^-5 S/cm.if limiting molar conductivity of acetic acid at the same temperature is 390 S cm^2/mol.the dissociation constant of acetic acid at that temperature is? Why must a solution be saturated for it to be at equilibrium? Catalyst verses Reaction Intermediate? Please help me to understand? Question #49265 Question #06e39 What volume of #HCl(g)# will result from the reaction of #50*L# #H_2#, and #50*L# #Cl_2#? In what order did Mendeleev arrange the elements in his periodic table ? Explain why aluminium in the periodic table has a higher melting point than sodium? The combustion of 40.17 g of a compound which contain s only ,, and yields 58.67 g of CO2 and 15 g of 2. Another sample of the compound with a mass of 75.00 g is found to contain 22.06 g of . What is the empirical formula ? Question #43c5d Question #7312f Why are reaction rates relevant and important to society? Is 2H2O2(aq)=2H2O(l) + O2 (g), only decomposition, or also combustion? The elemental analysis of penicillin is, #"carbon, 57.47%; hydrogen, 5.43%; nitrogen, 8.38%; oxygen, 19.14%; sulphur, 9.59%."# What is the empirical formula? Question #ad6bb Question #dcaab Question #ed026 What is the mass of a sample of ice that requires 850.0 joules to completely melt at 0 degrees Celsius? Why do transition metal ions form coloured complexes? Question #13273 Question #84db3 What is the difference between a three-base pyramid and a tetrahedron? 8 g NaOH is dissolved in 250 ml solution. If solution is diluted to 500 ml then moles of NaOH and molarity of dilute solution would be ? Question #c50f5 Question #dae25 Question #bc3eb Question #dc047 Question #043b0 Two equivalents of hydrogen gas react with one equivalent of dioxygen gas to give one equiv of #X#. What is #X#? Question #3c3ee Question #cb7b2 Question #bfe2a Question #94612 How many moles of #"water"# would be produced from the combustion of a #4*mol# quantity of #"methane"#? Question #18fa4 What is the (mass) percent of carbon element in sugar? Question #5c26a Question #ccba1 Question #e1a77 Question #71b91 Question #57f3f How many moles of chlorine are present in 2.47 g of phosphorus pentachloride? How do you derive this relation for enthalpy using this equation for internal pressure? How much heat is released when 25.0 grams of steam condenses at 100 degrees celsius? Question #6f7ee 2 mole of an ideal gas expanded isothermally and reversibly from 1L to 10L at 300K. What is the enthalpy change?? The solubility product constant of CaSO4 is 2.4 x 10^-5 mol2dm-6, K sp of Ca(OH)2 is 5.5 x 10^-6 mol3dm-9 and K sp of CaCO3 is 8.7 x 10^-9 mol2dm-6. How can I calculate the concentration of Ca2+ in the solution? Question #f4402 Combustion analysis of 0.600 g of an unknown compound containing carbon, hydrogen, and oxygen produced 1.043 g of CO2 and 0.5670 g of H2O. What is the empirical formula of the compound? How many moles of dihydrogen are required to produce a #3*kg# mass of ammonia? What is the effect of heating up a solution with Zinc and Hydrochloric Acid that is reacting? Question #2d9b3 Question #d851d Question #c7c8a Question #31102 How to calculate the concentration of Ca(OH)2 if the pH of this solution is 9.2? Suppose that 10.78 mL of 0.0512 M NaOH were required to titrate a sample of unknown acid. How many moles of NaOH were used? How many moles of sodium hydroxide are required to titrate one mole of phosphoric acid? Question #6e7c3 Question #e9e16 Question #85f01 Question #f965b Question #33c25 When 1988 J of heat energy is added to 47.4 g of ethanol, C2H6O6, the temperature increases by 17.1 degrees Celsius. how is the molar heat capacity of C2H6O calculated? If HSO3- and HC2O4- are both put into water what will the equilibrium equation be? A mixture of hydrogen and methane gas in which #P_(H_2)=2.5*atm# are confined in a piston of #1*L# volume. The piston is expanded to #5*L#; what is the NEW #P_(H_2)#? Question #2ba6e What is the decomposition equation for the compound H2O2? Question #d1400 Question #8ef87 Question #8f484 What will the potential energy of an electron in a atmosphere of 71% #N_2# and 21% #O_2# and 4%co2 and 4 percent water vapour? If each balloon is filled with carbon dioxide gas at 20˚C and 1 atmosphere, calculate the mass and the number of moles of carbon dioxide in each balloon at maximum inflation. Use the ideal gas law in your calculation? Question #ab184 Question #f01a9 Question #0b882 Question #0d026 Question #6615c What is the maximum pH that can be established in CA(OH)2.? KSP=5.5×10^-6 PH of a saturated solution of Ba(OH)2 is 12. Hence ksp of Ba(OH)2? May I know why in electrolysis at cathode if there is a competition between two reactions the reaction which has higher value of Standard Electrode Potential(SEP) is preferred and at anode the reaction which has lower value of SEP is preferred ? Question #03651 Question #d1d01 Question #2d2ff Question #7e766 Which reagent is in excess? Question #4b751 What mass of aluminum oxide can be recovered from the complete reaction of 30.4 g of Al with 30.4 g of oxygen gas? 4 Al (s) + 3 O2(g) Õ 2 Al2O3(s) The vapor pressure of pure cyclohexane (C6H12) and pure toluene (C7H8) at 20°C are 66.9 and 21.1 torr, respectively. The total pressure above a mixture of these two liquids is 50.0 torr. Calculate the mole fraction of cyclohexane in the liquid mixture? At 20.0°C, the vapor pressure of ethanol is 45.0 torr, and the vapor pressure of methanol is 92.0 torr. What is the vapor pressure at 20.0°C of a solution prepared by mixing 31.0 g methanol and 59.0 g ethanol? Question #227aa Question #0f756 Question #cca44 Question #b7f2c Question #ed52f Question #2bad2 Question #c4b9c Draw the diagrams for #"NO"_2^-#, #"NO"_2^+#, and #"NO"_2#. The HOMO of #"NO"_2^-# shows it is somewhat anti-bonding. Would you expect the nonbonding electron pairs on nitrogen or oxygen to be more reactive? Discuss Question #f62ec How does potassium react with water? C4H10O show which isomer ? Question #0ae04 Question #035e4 What is the name of this compound?? Why does CS2 reacts with water , but CCl4 doesn't? Question #fa76f How to calculate the atomicity of NaOH? Question #fa883 Give value of n and l for 2s orbital ? How can the latent heat of vapourization be determined? A sample of 1cm3 of hydrogen and 1cm3 of oxygen both at NTP.which has a larger number of molecule ? What are halides? If 575 grams of frozen ethonal are warmed to the freezing point of ethanol, how much heat is required to melt all of this frozen ethanol, CH3CH2OH, at the freezing point? The molar heat of vaporization of ethanol= 4.95 kj/mol Question #33c9f What is linear combination of atomic orbitals for CO2? How does #10^(–4.80) = 10^(log[H3O+])# become #10^(–4.80) = [H_3O^+]#? Please see image below, under the heading #Method 2: 10^x Function#. Question #45c8a Question #96dde Question #b216d Question #5e126 How many moles of cobalt III bromide are present in 4.34 grams of this compound? How is the reduction of nitric acid to #NO# represented? why are the energies below different ? both are just breaking the same type of bond: ONCl --> NO + Cl >H= 158 kj mol-1 NCl3 --> NCl2 + Cl >H= 375 kj mol-1 Question #e2e34 Calculate #[H_3O^+]# for a solution that has #pH = 1.76#? Question #dab50 Question #06e5c Question #55e37 Question #7291f Question #045b1 How do you calculate the mole ratio for two compounds to predict a base amount to neutralize an acid? What is the enthalpy of formation for one mole of carbon dioxide derived from carbon monoxide and oxygen? Question #7b441 Arrange the following in order of increasing mass? 16 water molecules 2 atoms of lead 0.0000000000000051 moles of helium Use the two point form of the Clausius-Clapeyron equation to calculate the vapor pressure of carbon disulfide at 15 degrees C. This temperature in kelvin would be 288. The normal boiling point of CS2 is 46 degrees C. This temperature in kelvin.......? Question #fc646 A 7.12 g sample of Mg is heated with 1.80 g of Br. All of the Br is used up and 2.07 g of MgBr is produced. What is the mass of Mg that remains unreacted? A 57.50 g sample of metal changes its temperature from 10.5 °C to 57.7 °C when it absorbed energy from a 87.7 g sample of water whose initial temperature was 65.1 °C. What is the specific heat of the metal in J/g·°C? A sample of indium weighing 0.500 g is found to contain 0.2404 g of chlorine. What is the emprical formula of the indium compound? What is the charge of the indium compound? Question #780bb A solution of Ca 2+ is added to a solution of SO4 2- and CO3 2- , what will precipitate first , CaCO3 or CaSO4? Question #49cfa How many atoms in three moles of #Na_2O#...? Question #5352d Who exerts more pressure-gas or liquid? Question #28c42 Question #54fa6 Question #efc0d Question #69943 Question #78369 Question #4035f Question #556a0 Question #4ea82 Calculate the theoretical % water in this hydrate. The formula for the hydrate is CuSO4 • 5H2O? Question #ad4c6 Question #a7d7b A rigid container contains #"34.5 g N"_2"# and #"10.3 g CO"#. What is the partial pressure of #"CO"# in #"Torrs"#? Question #6a249 Question #67a4c Question #ddd3d Question #285c4 Indicate in each case base, acid and conjugate pairs? Question #2381f 34.6g of propane is initially at 0 degrees celsius and 100kPa. If the temp of the gas is accidentally raised to 25 degrees celsius, what mass of propane must be released in order for the volume occupied by the gas to remain constant? Question #5db68 What is the molarity of a solution prepared by dissolving 4g of NaOH in 100mL of solution? Question #6cdec Question #3a51a Question #76278 Question #8382a Question #24216 Question #ba857 Question #f0318 Question #3080d Question #fb0a7 Question #f6cb7 Question #00568 Question #09ec8 What is true about the elements on either side of the line? What about the elements that are on the line? Europium can have a 2+ or a 3+ charge. Which one of the formulas is not possible? 1) EuSO4 2)Eu2(SO4)3 3 EuPO4 4)Eu(NO3)3 5) EuHCO3 Question #f5ba3 Question #f688c Question #96f83 Question #5e2a8 How many grams of silicon are in a computer chip with 1.08 x 10^23 atoms of Si? Question #73cc8 Question #60535 Question #587a8 How many moles are in 2.2 grams of niacin? Question #fe281 Can the Uncertainty Principle equation be derived from the Schrodinger equation? Kindly show all steps? Question #97cb7 Schrodinger equation in 1 dimension Question details in the image? Question #dfcec Question #d1cc8 Question #eefd5 What is the test to distinguish between ethanol and ethanoic acid? The freezing point of p-dichlorobenzene (MW = 146.992 g/mol) is 53.1 °C. Its Kf value is 7.10 °C/m. A solution of 1.52 g of sulfanilamide in 10.0 g of p-dichlorobenzene freezes at 46.7 °C. ? Question #97d78 What is the balanced net ionic equation for sodium hydroxide and phosphoric acid? What do you call a hydrate that has been heated and lost it’s water of hydration? How many kilojoules of heat are released when 2500 grams of gaseous ethanol at its boiling point are converted to liquid ethanol and then cooled down by 55 degrees celsius? What is the % of carbon in the hydrocarbon, if #2.20 g# of #"CO"_2# is formed by complete combustion of #1.50 g# of a hydrocarbon? ( C= 12, O= 16, H= 1) (#M_r# of hydrocarbon is=60) How was bohr's model modified in the modern quantum atomic model? Question #bb4d7 What are the tests for alkanes? Question #d3eb8 Question #da5b0 Question #d07e1 Question #033ea Question #22e51 Question #f6b8e Question #0686b Question #f12aa Question #e5bda Question #e7625 How many hydrogen atoms in a mole of hydrogen molecules? Question #ce980 How many grams of solute should be used in preparing 0.200 m C12H22O11 in 2.50 x 10^2 grams of water? Question #d26a5 Question #c86a4 Calculate the molarity and the molality of a solution prepared by dissolving 2.00 g of ethanol (C2H5OH) with 100.0 g of water to give a final volume that is 102 mL? Question #ed23a Question #6ab87 Question #c2254 A value of 345mm is a measure of? Question #59120 Question #a3fcc What is the possible arrangement of the isomers of molecular formula C4H9Cl in order of decreasing rate of reaction with sodium iodide in acetone? Question #0cfcc Question #48a02 Question #bd76e How do we know which integrated rate law to use for #["dye"]# and how can that help us find the order of reaction? Question #a8bd9 Question #1db9f Question #bfeb3 Question #7ef80 What are the mole fractions of H3PO4 and water in a solution of 14.5g of H3PO4 in 125g of water? Chemistry help? :( How would I calculate the energy (in kilojoules) for 1 mole of a photon having a wavelength of 623nm? If I first calculated the energy of the photon in Joules and got 3.20x10^-37J. Question #33877 Help with Rate Constant Calculations? Question #fbb1e Question #2c67d An 18.4 ml solution of 0.350 M nitric acid reacts with 25.3 ml of a sodium carbonate solution according to the equation. How many moles of nitric acid and moles of sodium carbonate reacted? What is the molarity of the sodium carbonate solution? Name the anhydrate first and then use prefix for the number of waters, and then add the word “hydrate” for CuSO4 • 5H2O ? Question #e6b99 Question #a98de Question #a865d Question #b6b77 Question #c7c94 In this reaction, #4.58 L# of #O_2# were formed at #745 mm Hg# and #308 K#. How many grams of #Ag_2O# decomposed? #2 Ag_2O(s)# Õ #4 Ag(s)# + #O_2(g)# Question #fcf28 Question #34ba5 Question #f4fc4 A hydrocarbon contain 0.0334 mol of carbon, 0.0668 mol of hydrogen and 0.0167 mol of oxygen. what is the empirical formula of the hydrocarbon.? What is aromaticity? What are the rules for?? Question #d2265 Chemistry help molality? If each orbital can only hold 2 electrons, what about the valence electrons? Shouldn't there be eight? Question #66ba1 Question #b2c67 Question #6e92e Question #a3516 Question #1258c Write the symbolic notation of on isotope of an element having 8 protons 8 electrons and 8 neutrons? Question #6d52d Question #19a66 Question #2583e Question #7dc35 What mass of pure sulfuric acid would be required to react with sodium hydroxide to give an #8.00*g# mass of #Na_2SO_4#? For the redox reaction, #MnO_4^(-) + C_2O_4^(2-) + H^(+) -> Mn^(2+) + CO_2 +H_2O# The correct coefficients of the reactants for the balanced reaction are respectively, #MnO_4^-# , #C_2O_4^(2-)# , #H^+# ? :Question #259b4 Question #afeda Question #d9230 Question #94750 ClO2- + HCOOH(aq) ---- HClO2 (aq) + HCOO-(aq) Keq<1 what are the relative strengths of the acids and bases in the reaction represented by the equation above ? (SOS) If 5.180 x 10ˆ24 atoms of water are made, how many moles of propane are needed? What about grams of oxygen? Question #a2eb4 A molecule of oxygen gas (O2) has a velocity of 2800 m/s. What is its de Broglie wavelength? Question #73e94 Calculate molecular weight of pantothenic acid vitamin B5 C6H17NO5? 2) the recommend Daly allowance of niacin 15 mg. How many moleculars of vitamin B3 does the government recommend that you ingest every day? Question #2b6ab Question #f9e09 What is the range of acetaminophen dosages, expressed in mg acetaminophen/kg body weight, for children who weigh between 24 and 35 lb? Suppose 10.000 grams of a hydrate were placed into a crucible and then heated until all the water was driven off. The mass of the anahydrate was 7.500 grams. Calculate the percent water in this hydrate? Question is kind of long. Can someone please help me? If 20.6mol of carbon dioxide is produced in the reaction below, how many moles of water is also produced? 2 C2H6 + 7 O2 Õ 4 CO2 + 6 H2O Question #7e06c Is H2PO4- stronger than HCN? The pH of 0.010 M o-cresol is 6.05. Find the pKa for this weak acid.? Cresol: C6H4(OH)(CH3) Given a set of acids, will the weakest acid have the strongest conjugate base? Question #990ab Question #2c590 A medication is prescribed at 4.00 mg/kg of body weight. If the patient is given 320. mg of medication, what is that patient's body weight in pounds? What volume is occupied by a #0.210*mol# quantity of gas given standard conditions? Question #9685a Question #c409b If there is a hydrogen atom in vacuum,will the momentum of the electron will be constant or not ?Why will it change Question #b54c5 2 NO(g) + O2(g) Õ 2 NO2(g) Suppose that at a particular moment during the reaction nitric oxide (NO) is reacting at the rate of 0.070 M/s. (a) At what rate is NO2 being formed? (b) What rate is molecular oxygen reacting? Question #2d1ef Question #d8298 What is meant by stoichiometry? What mass of hydrogen gas results from the action of a #125*mL# volume of #6.0*mol*L^-1# #HCl(aq)# when added to excess magnesium? Question #8a1bf Calculate the fequency in Hz of electromagnetic radiation released when an electron makes the transition from n=5 to n=2 ? What is the test to distinguish between ZnSO4 and ZnCl2? Question #ce197 Question #170a0 Question #e8560 Question #e4ee3 Question #b645f What is mass of 2,4,6 trinitroaniline C6H2(NO2)3NH2 (Mr 228), that can be obtained from 10g of aniline, C6H5NH2 ( Mr 93)? Question #95591 Question #99670 Question #5879c Question #4a62a Question #b27a2 Question #63868 What is the difference between emperical formula and molecular formula? #50ml# of solution which is #0.10M# in the acid #"HA"#, #pKa=4.00#, and #0.050M# in #"HB"#, #pKa=8.00#, is titrated with #0.20M# #"NaOH"#. How can I calculate the pH at (i) the first eq.point (ii) at the second eq.point.? answer is (i) 6.15; (ii) 10.23 Question #51c0f Question #8ef89 What is the amount of heat required to warm 3.47 moles of water from 25°C to 55°C? The Alchemists worked hard to transform lead into gold. It did not work. But in the 20th-century gold was transmuted into lead. How did this happen and where? Question #3f769 Question #05a96 What element’s valence electrons are located in 5s^25p^5? Question #93563 From the equilibrium constants below, calculate the equilibrium constant for the overall reaction? The Kafor hydrofluoric acid is 1.5×10−11.What is Ka for the fluoride ion? What is the net ionic equation for for the reaction between Sr(OH)2 and H2SO4? Question #2301e Calculate the enthalpy of combustion of methane,if the standard enthalpies of formation of methane, carbon dioxide, water are -74.85,-393.5 and -286? Help! Kinetics and the Rate of Formation??? Vapor Pressure Problem Please Help? Chemistry 2? Question #cb01f Osmotic Pressure problem with a Protein? Question #d09ec Question #f3e72 Question #17c42 Please help me with Freezing Point one last time? I am still having trouble and I only have one last try to get it correct? Where am I going wrong? Question #80a44 Question #b4ee7 Question #1726c 10 moles of CH4 at R.T.P would produce what volume of CO2? How can one describe the #Deltap " and " Deltax# in respect to the Schrodinger Equation? Question #e4423 Question #387ac Question #d422b If #[MgCO_3(aq)]=4.5xx10^-3*mol*L^-1# under given conditions, what is #K_"sp"# #MgCO_3#? What is the mass of H2O obtained when 30g of C2H6 completely reacts with 500 g of O2 (C=12, H=1, O=16)? What mass of carbon dioxide results from the complete combustion of #359*g# propane, and #359*g# methane? Boiling Point Help! Solution has 8.35g l2 in 71.0g of toluene. Assuming I2 is nonvolatile. Toluene, Tb = 110.63celsius and Kb = 3.40celsius*kg/mol ? Assume that 94% of hydrogen is in the form of protium, 4% is deuterium and 2% is tritium. Calculate the atomic mass.? Question #61a18 Chloroform is a hydrocarbon or not? What is the specific heat of the unknown metal sample? Question #1bba4 Question #c7774 How many oxygen atoms in a 10 mole quantity of potassium dichromate? What are diamond, quartz, and monotone? Question #2e5c3 What is the mass number of an element? Which liquid has the highest boiling point: glycerol; acetone; ethanol; peanut oil? 1mole is equal to _mole of (STP)? Question #66236 Question #136e3 Question #320ec Question #6dc18 Question #5aafc Question #2ab6d Why sodium lauryl sulphate is added to toothpaste sensodyne as it is a detergent? Please explain. Question #43ca5 An irregular shaped solid was carefully lowered into a 1000-mL graduated cylinder containing 536 mL of water. When the solid was completely under water, the water level rose to 720mL. What is the volume of the solid? Question #4f5b5 Question #77b33 Can an acid base reaction be at equilibrium? Balance the equation using the smallest whole number coefficient?: C3H8(g)+O2(g)--->CO2+H2O+heat What is the mass in grams of #1.88 xx10^24# molecules #"CH"_2"O"#? How a saturated solution can become supersaturated ? also how do i include chemical equilibrium concepts here? A certain substance has a heat of vaporization of 66.77 kJ/mol. At what Kelvin temperature will the vapor pressure be 7.00 times higher than it was at 329 K? Question #29aa5 What is the atomic mass of Uranium? Question #a6138 Question #432dd Question #0625e What is the nuclear structure of elemental ion? How much 0.1N HCl will a tablet of 200 mg Mg(OH)2 neutralize? Calculate the volume of carbon dioxide gas lost at 25 degrees and 100kPa? Question #21b04 Question #b4e7a Density of a solution? Question #3a226 Question #ef7b2 Does someone know how to answer this question? Sodium acetate is used in heat packs due to its ability to crystallize and re-dissolve. how is enthalpy part of this reversible reaction ? number of valence electrons in an atom of Chlorine? Question #94f9b Question #f9b75 Question #c65c6 3.01e22 Ag+ ions is present in? options a) 85 grams of AgNO3 b) 0.85g AgNO3 c) 8.5g AgNO3 d) 18.5g AgNO3 Question #7c97b Question #a5a3c Question #2a70b How much heat (in kJ) is required to convert 423 g of liquid H2O at 24.0°C into steam at 152°C? (specific heat of liquid water is 4.184 J/g·°C, the specific heat of steam is 2.078 J/g·°C, and that both values are constant over the given temp)? Question #fc657 Question #a6c07 Question #4ed9e Question #94818 What wavelength should the astrophysicist look for to detect a transition of an electron from the n=7 to the n=3 level? How might barium cyanide react with carbon dioxide? Please Help - Percent By Mass Problems? Question #a0499 If 13.3 moles of Cu and 43.2 moles of HNO3 are allowed to react, how many moles of excess reactant will remain if the reaction goes to completion? 3 Cu + 8 HNO3 Õ 3Cu(NO3)2 + 2NO + 4H2O Question #1830f Question #1ba30 Element that corresponds to atomic number 18? IUPAC name of Acetopheone?? Question #de89c Convert 4.92 µm to inches? Question #ac331 What is the mass of #2.5*mol# of sodium metal? Enzyme X converts substrate S to product P. When the total concentration of X is 1 µM, Vmax and Km are 1.0 x 10^-3 M/s and 0.10 mM, respectively. What is the value for the kcat/Km? Question #f12ac Question #65a7f What is the average molar mass of a gas that is 67.0% H and 33.0% He? Question #8a733 Question #70857 A compound X contains 50% sulpher and 50% oxygen by mass. what is the empirical ( simplest) formula of the compound X? Options a) SO b) SO2 c)SO3 d) SO4 please please Explain. :( How many electrons has an atom with atomic number 12? Question #98279 What is the formula of Ozonide? Write the formula of the simplest chloride you would expect the element of atomic number 33 to form? Draw a diagram showing the bonding present in this chloride.State the sape of this chloride molecule? On addition of #NaOH# to #CH_3COOH# solution, #60%# of the acid is neutralised. If #pK_a# of #CH_3COOH# is 4.7 then the pH of the resulting solution will be? Question #10b23 Question #7df75 Why does mercury form weak metallic bonds? Why can't elements in Period Two exceed an octet? Question #1d348 Question #16cfd Element that corresponds to atomic number 10? Boron, B Nitrogen, N Neon, Ne Nickel, Ni Does Oxygen have higher electron affinity than Cl? Question #9ff11 The volume of a sphere is given by #V = (4/3)r^3# , where r is the radius. Compute the volume of a sphere with a radius of 141 pm. State your answer in units of #m^3#? Question #660d4 Question #6b4b6 Carbonate mixtures??? please Question #41687 With what does nitrogen typically react; what is the product? Question #91b45 How many silicon-30 atoms are found in this plate? What is the percent composition of sodium sulfate, Na2SO4? Ammonium sulfate is formed by the reaction: 2NH3 + H2SO4 => (NH4)2SO4 If 50 moles of H2SO4 is added to excess NH3, how many moles of product will be formed? How is it done? Sodium nitrate is formed by the following reaction: 2NaNO2 + O2 => 2 NaNO3 How many grams of NaNO2 must be added to excess oxygen to make 100 g product? Question #82766 Is zinc chloride a volatile substance? Question #9dc07 Question #430b1 Question #311ad Question #55b04 Titration help? You have two balloons. One is filled with 27.0 grams of CO and the other is filled with 27.0 grams of carbon dioxide . Which balloon has more particles present? Question #7eb68 Question #5f2c1 how a saturated solution can become supersaturated ? Question #9c8c9 Question #32462 Question #1730e How can you chemically coat copper coins with a layer of zinc? Question #6b797 If atomic number is the number of protons in an atom, what do we call the number of neutrons? Question #eb600 Calculate the amount of energy evolved (in kJ) when 2.50 mg of 2H undergoes fusion according to the equation below. 2H + 3H = 4He + 1n ? Question #6358b How can a shell in an atom store more than 8 electrons ? 1.00kj of energy transferred as heat to O2, external pressure is 2.00atm. O2 expands from 1.00L to 3.00L against this constant pressure. Calculate w and change in internal energy (delta U) when O2 is ideal gas? Question #a0fba Question #1b7e2 How do you calculate ΔHF° given two reactions and their respective ΔHrxn° values? Question #f0862 Question #93587 Question #a55a7 What id the mass in grams of 2.00 x 10^23 molecules of F2? Question #8a90d Do suspensions exhibit the Tyndall effect? Write an equation to show how the HSO4- ion can act as an Arrhenius acid and write an equation to show hoe HSO4- ion cam act as a Bronsted-Lower base? Question #54da7 Question #f6d6e How much energy (in Joules) is required to melt 500g of initially at 0c? Question #0e721 Question #5a784 Question #54ef3 Question #3b2bb Question #8e3ba What would be the final pH if I add 25 ml of water to 25 ml of a 0.1N HCl? Find the #["H"_3"O"^(+)]# and #"pH"# for the following? Question #e44ae Why can phosphorus exhibit #P(+III)# and #P(+V)# oxidation states? Question #3a1f6 Question #4914e Question #1ea23 At #-35# #""^@C#, and #5.8*atm# pressure, how many moles of gas are present? Calculate the volume of 50 g of sodium chloride? Question #f32b9 Which of the following is more stable? Atoms with _____ atomic radii have low ionization potential. Small or big? Convert 8.92 yards to Furlongs given the following facts 1 yard equals 0.9144 meters 1 Furlong equals 201.12? Question #951f1 Question #a4c8d Question #df4ee Question #91606 What is the energy in Joules of a single photon with wavelength of 154 nm? Question #44eaa Question #64fec Question #e024a Question #fc5c6 An automobile gasoline tank holds 47 kg of gasoline. When the gasoline burns, 165 kg of oxygen are consumed and carbon dioxide and water are produced? Calculate the pH of a solution resulting from the addition of 15.0 mL of a 0.340 M NaOH (aq) to 25.0 mL of 0.250 M HCl (aq)? What is the concentration of calcium in a solution of calcium hydroxide prepared by adding a #10.0*g# mass of metal to a #250*cm^3# volume of water? Explain why atoms have different isotopes. In other words, how is it that helium can exist in three different forms? The solubility of sodium acetate is listed in reference books as 123 g/10.0 ml H2O @ 20° C. What do these numbers mean in terms of a saturated solution? Be VERY specific in your explanation. What's the difference between a galvanic cell and an electrolytic cell? Question #95f3d Question #82928 If 0.250 g of a gas sample represents 1.05x10–2 mol, what is the molar mass of the gas? The ionization potential of an atom is defined as the energy required to completely remove an electron . using Bohr's theory , calculate the ionization potential of the hydrogen atom? Do you consider the dihydrate of barium chloride dihydrate when calculating the moles? Question #ea252 Question #6f2d0 Question #b180a Question #02f6e Question #e7db4 Question #288b9 Question #8fe11 Question #e818d Question #54097 What volume of 0.25 M solution can be prepared using 0.50 mole of KCl? Question #89a6e Convert 0.7712 moles of oxygen to liters with sig figs. HELP?! Question #87343 What is the levelling effect? How to calculate the pH of this solution? 0.002 mol of solid calcium hydroxide is added in 250 mL solution of hydrochloric acid with the concentration of 0.004 mol / L. What is the molar mass of gold metal? What is the order of increasing ionization energy for #Ne#, #F#, #Na#, #Mg#? Question #9be94 Name the device used for measuring the mass of atoms and molecules?? Question #a405f Distinguish between the first, second and third ionization energies of an atom? If an electron jumps from the n=2 orbit to the n=3 orbit, then what kind of spectrum will be produced: a continuous spectrum, an absorption line spectrum, or an emission line spectrum? Question #4348b Question #328d1 Which has a higher melting point? AlN or MgO, please explain in detail with one. And how do I find out which element is bigger. What is a understandable explanation of bonding in ammonia? Question #4066d Question #ea331 Question #06d2c Question #dab18 Question #81593 Question #89b68 Question #8453e What is the wavelength of light (in nm) if #1.21*10^21# photons have a total energy of #483 J#? Why Cr has dpi ppi multiple bonding? Question #c390b Question #961d0 Question #3fc7f How many moles of nitric acid are consumed when 13.1 moles of calcium nitrate are produced? Question #6e8cf How many grams do I have to take from the calcium chloride dihydrate? Question #e774e How many moles #"O"_2# are needed to produce #"3 mol H"_2"O"# in the following reaction: #"2H"_2 + "O"_2"##rarr##"2H"_2"O"#? Question #fb500 Which of the following Ka values represents the acid with the strongest conjugate base? Question #53656 Why do most chemical reactions require multiple steps (reaction mechanism) and can't complete itself in one collision? Question #1d1b5 Question #0f162 Balance the following redox equation and determine how many electrons were transferred. #Zn(s) + Ni^(3+) (aq) Õ Zn^(2+) (aq) + Ni(s)#? Why is the normal boiling point of a liquid the point at which the vapor pressure is equal to atmospheric pressure, #"760 torr"#? Question #090fc Question #75ae5 Question #54b61 The equation for the reaction of 6.5 g of zinc granules with 0.28 moles of nitric acid is as follows: 3Zn + 8HNO3 3Zn(NO3)2 + 2NO + 4H2O can some one do it please? Question #7d57f Question #4d1e8 Question #8e8a1 Question #5f870 Question #c4329 Question #9f33a Question #a4b0a What is the stoichiometric relationship between nitric acid and calcium nitrate? (need help asap) Whats the difference between an element, molecule, atom and compound? The weak base ammonia (NH3) accepts a proton (H+) from water to form a basic solution. What is the concentration of OH– ions in a 0.75 mol L–1 NH3 solution? How much calcium metal must be added to an excess of water to produce 3.7g of calcium hydroxide? Question #aee22 Why change in dipole moment or fluctuating dipole moment is necessary for absorption of infrared radiation? When hydrogen peroxide decomposes, what mass of hydrogen peroxide is needed in solution to produce 1.6g of oxygen gas? Question #94c10 What are the noble gases? What mass of oxygen will exactly react with 6.0 g of magnesium? Question #a256a Question #ae0a8 Question #00d19 Question #b2449 Question #374d2 How can the ionization energy of sodium be calculated knowing that the value of the wavelength at the Start of the continuum in the emittion spectrum is 242nm? Question #65c40 Question #e60d6 Question #6bab1 Question #91807 Recommended daily allowance of ascorbic acid for an adult male is 90 mg and 75 mg for female in an average mango contains 2 x 10 to the 20th power molecules of vitamin C one a sorbic acid how many mangoes do you need to eat if you are female? Two tough chemistry questions? Question #c65e7 Why do polyprotic acids become less acidic as they lose protons? Question #5528b How do I solve these? Final tomorrow, help please! What is the #DeltaH_"vap"# for ethanol and propane? Calculate the limiting value of the fraction of dissociation () of a weak acid (pKa = 5.00) as the concentration of HA approaches 0. Repeat the same calculation for pKa = 9.00.? Question #7b556 Which of the following set of solutions could be used to prepare a buffer solution? Question #fc49e Question #53d35 Which molecules can exceed the octet rule? And why do they do this? Solutions help? Titration curve? Please help... Question #f102d Question #fcfdc How does water's polar nature affect its ability to dissolve a variety of substances? Question #a62a2 When is a reaction said to be spotaneous? Calculate the number of atoms? Question #4f6f1 How does dry ice work? Question #0e1af Question #b4ff4 Question #a172d Whats the best way to memorize chemistry equations? Question #bebb2 Why the graph of V-T when drawn,is put as dotted line near the origin? Question #90588 Question #35847 When magnesium metal reacts with chlorine gas, how many electrons a Magnesium atom loose? How many electrons a chlorine atom can accept? How does that tell you the formula of the product? Give the formula and name of the final product? What are interstitial compounds? Question #b3c3b Which has the strongest molecular bond? Fe, C24H50, or CaCO3? Metal+ water = metal oxide + hydrogen then how potassium forms potassium hydroxide on reacting with water. This formula is given in NCERT? What type of reaction is this ----> NaH + H2O = NaOH + H2 ? In the extraction of iron in the blast furnace, how is the slag then seperated from the molten iron? Being given the structure of hemoglobin, determine the hybridization state of the iron atom? What is the difference between the movement of particles in solid and the movement of particles in liquid? Question #dba03 Given the following information, calculate the density of sand? Ferrous ion was dissolved and diluted to250.0mL.25.00mL aliquot of the ferrous ion solution was titrated with0.01000M KMnO4 solution, and the mean of 3 acceptable, corrected titrations volumes was13.84mL.Calculate the mass of Fe in the250.0mL solution? Question #dd9aa Question #6eaaa Please Help with Mole Fractions? What is physically happening within an atom when covenant bonds are formed? Question #883a5 Question #777cb Please Help - Molality? What are the requirements of a standard for acid-base analysis? (3 points) Let 124 grams of Al react with 601 grams of Fe2O3. What is the mass (in grams) of the formed Al2O3? Question #3a4f7 Question #7f687 Question #13121 Question #b0c91 Please show the mechanism of Oxymercuration - demercuration ? Give an example to make it understand. Question #368d7 Question #1a869 Question #d8c73 Question #82d26 Question #c4172 Please Help - More Trouble with Phase Changes? Question #715fc What determines the state of matter of a substance? Question #6b355 80.0 L of oxygen is collected over water at 30.0 °C. The atmospheric pressure in the room is 96.00 kPa. (a) What is the total pressure of this mixture? [ans: 96.00 kPa] (b) What is the partial pressure of the oxygen gas? [ans: 91.76 kPa] Question #dec37 Please Help Me - Clausius-Clapeyron Equations? Question #29c2d How many atoms are contained in 0.10 grams of copper? Question #63783 Question #17a18 Question #dcb61 Question #1f782 Question #184bf If 125 grams of ice cools from -1.1 degrees Celsius to -5.7 degrees Celsius, how many Joules of heat were transferred from the ice? Redox Reaction. Which of the following ions is reduced by copper metal? a. Ca+ / b. Fe+3 / c. Hg+2 / d. Mg+2 Calculate the heat absorbed by 125 g of water (SH = 1.00 cal/g°C) when the temperature rises from 21.0°C to 35.0°C? Question #7c795 Out of the given atoms which atom have the highest energy of 2s-subshell? A) H ,B) Li ,C) Na Question #faf14 Question #283c3 How do we know that the atomic orbital angular momentum magnitude is #sqrt(l(l+1))#, where # = h//2pi#? Question #fc390 What is the molecular weight of vitamin K1 C31H46 O2-? Question #ff2dc An aluminium foil with a surface area of 500cm2 was anodized. Gow many coulombs of electricity were required to increase the thickness of the layer by 1*10^-3 cm (density of aluminium oxide=4.0g cm-3)? What is the mass of 211mL of a liquid that has a density of .880g/mL? Question #f88ab Why do Noble Metals do not react with dilute acids?? Please answer Thank you How many molecules are in a 671 g sample of CO2? How do one determine if a molecule is polar or nonpolar? Question #a229f Determine the number of moles in each of the following? Question #d9b58 What is the molar mass of the drug of #C_17H_20O_5S#? Question #d602f Question #660c2 Consider Hydrogen ion in a box having one dimension, then find electron probability distribution? Assuming 100% dissociation, calculate the freezing point and boiling point of 2.50m K3PO4? What is the ionic equation of #KOH + HCl -> KCl + H2O# ? How many moles are present in the following 50 g of calcium carbonate and 1.6 grams of sodium hydroxide? Is color change evidence that a chemical or physical change may have occurred? How many grams of oxygen can be produced from the decomposition of 200 grams of potassium permanganate? Question #69950 A solutIon made by dissolving 16.0g of CaCl2 in 64.0g of water has a density of 1.180g/mL at 20° C, see details for the questions? Question #5f93a What is the mass percentage of the gold in the alloy? What is the mass percentage of the palladium in the alloy? What is the volume of 6 M H2SO4 needed to prepare a 250 mL of 0.35 M H2SO4? What is common for substances that dissolve in water? How do you tell which element/ molecule is the most reactive? (nonmetals) When 1.045g of calcium oxide is added to 50.0mL of water at 25.0°C in a calorimeter, the temperature of water increases to 32.3°C. Assuming density of solution is 1.00g/mL and a specific heat capacity of 4.19J/g˚C? The elementary reaction 2H2O(l) <--> 2H2(g) + O2 (g) has the partial pressures of H2O, H2, and O2 reach 0.0500 atm, 0.00200 atm, and 0.00450 atm respectively. What is the value of the equilibrium constant at this temperature? Question #db6ff Question #cc7b7 Why are metallic solids so good at conducting electricity, but ionic solids are non-conductors? Question #8bd01 Question #da95d What are the ground state and the second excited state of a beryllium atom? Question #47828 What are the constituents of water? Question #4d79a Question #b1011 Which covalent bond is most polar? A H-O B H-F C H-N A voltaic cell consists of a Zn/Zn2+ half-cell and a Ni/Ni2+ half-cell at 25 C. The initial concentrations of Ni2+ and Zn2+ are 1.60 M and 0.130 M , respectively. What is [Ni2+] and [Zn2+] when the cell potential is 0.45V? Determine the number of moles in each of the following? Question #a1c07 For the following pairs of electron transition, which produces the emission with longest wavelength. give rationale behind your answer? (a) n=3--> n=1 versus n=2 --> n=1 (b) 3p --> 2s versus 2p-->1s Where should we take the valency of iron 2 and where should 3? Question #82d84 Question #6e3a6 Question #62dde Question #b1cf8 Question #ba9c6 Question #bcbe2 Whats the difference between glycol and glycoxyl? What are the mole fractions of CH3OH and H2O in the solution that contains 128g of CH3OH and 108g of H2O? Question #9ae6b Question #3e1be How much ammonia is contained in a #12*dm^3# volume of ammonia? How many hydrogen atoms are there? Question #a531c Question #81a6c How does CO act as a ligand? How many moles of each atom are present in a #1.01*g# mass of antifreeze, #C_3H_6O_3#? Can you propose an equation for the reaction between stoichiometric sulfuric acid, and sodium hydroxide? Question #425b9 Question #b0450 Question #a74b5 Question #4239b Question #d2528 Question #7d547 Does a high +ΔG mean that the reaction is irreversible (and equilibrium cannot be attained) or that the reaction lies to the right? Regolith is sampled on mars and he concentration of potassium-40 is 120 ppm. In a crater, potassium-40 is only 12 ppm. If the half life of potassium-40 is 1.2 billion years, how long ago was this crater formed? How many molecules of hexane are contained in 25.0mL of hexane? The density of hexane at room temperature is 0.6548g/mol. Question #dd2da Question #cf8be Question #4a9c9 How many grams of NaOH would you dissolve in 0.80 L to make a 0.25 M solution? When 1.0 mol of H2O2 decomposes to form H2O and O2, 103 kJ of energy is released. Given the bond energies below, what is the bond energy of the O-O single bond in H2O2? What are the characteristics of matter? What is the intermolecular space??with radius. How an atom will look like with all atomic orbitals around it's nucleus? Explain why enthalpy data alone cannot be used to predict whether a reaction can occur spontaneously or not? What quantum number defines a subshell? How do we label each subshell? How many orbitals in each subshell? A 24.39-g sample of a solid is placed in a flask. Toluene is added to the flask so that the total volume of solid and liquid together is 50.0 mL. The solid and toluene together weigh 47 g. [ . . . ] What is the density of the solid? Calculate the enthalpy change.? Question #f1d5f Question #89db2 Why polymers are less dense than metals? Why polymers are less conductive than metals? Why polymers are less hard than metals? How do I calculate mass loss per mm^2 given length, diameter, initial and final mass values? A bottling plant has 151,550 bottles with a capacity of 355 mL, 123,000 caps, and 33,500 L of beverage....? Why can seawater carry an electric charge? Question #293ca How many total orbitals in shell n=4? What is the relationship between the total number of shell and the quantum number n for that shell? Consider the following quantum numbers sets; determine if they can occur together to specify an orbital. If not indicate which rule has been violated? Question #50457 What is the identity of the element X in the following ions? What is the Gibbs free energy of formation of methane at 298 K, using the given information? This reaction shows the complete combustion of octane, C8H18, a component of gasoline....? Question #cbdf9 What is the molar mass of cholesterol if 0.438 mol weighs 169.37 g? Hint: What is the definition of molar mass? Question #ddb20 A particular radioactive isotope decays from 200 milligrams (mg) to 178 mg in 9 days. Find the half life of the isotope.? Question #2b6b7 Question #4b35a Question #7ab96 Does copper metal and copper(II) oxide have the same physical and chemical properties? Question #bb386 Question #eb5df How much water in kilogram is required to prepare 2.5 molar solution containing 20.0g of NaHCO3? What simple molecule has the same #"empirical formula"# as #"benzene"#? Question #044f8 Question #3fa4e Why don't pure solids or liquids shift equilibrium? Question #36007 Will a solution of #H_2SO_4//SO_4^(2-)# be a buffer? Why or why not? Question #2535b Question #fe768 Question #148f4 Question #f3e9a Question #04903 Calculate the ratio of total aspirin concentration (#"HAsp" + "Asp"^(-)#) on the L/R side of a membrane between blood plasma and the stomach, if #["HAsp"]# is the same on each side of the membrane? The stomach #"pH"# is #1.00# and blood #"pH"# is #7.4#. Question #76678 Question #bef06 Question #a3260 Question #01c6a 9.76g of a metal form 20.9g of its oxide whose formula is M2O. calculate the relative atomic mass of the metal? Question #22f50 Question #08e1e Question #b2c1b How many grams of sucrose should be dissolved in 100 g water in order to produce a solution with a 105°C difference between freezing point and boiling point temperatures? (M.Wt sucrose = 342, Kb=0.51, Kf=1.86) Find the molar heat of combustion.? What is the concentration of nitric acid in the solution? Question #43a86 How many liter/s of HCl solution can be prepared from a 5N HCl solution which contain 2.657 gram equiv HCl? Question #2943c A 6.00% of NiSO4 solution contains 40.0g of NiSO4.Calculate the mass of the solution? Is there a limit to the number of orbitals in a specific shell? Question #d7b7b What energy results when #"n-butane"# is combusted? Which one have the longest wavelength, X-Ray, visible light, or microwaves? Question #54c78 Question #bb93b How many grams of ice at 0 degrees celsius & 101.3 kPa could be melted by the addition of 0.400kj of heat? Find the temperature increase in #""^@ "C"# expected for #"1.00 L"# of water when it absorbs all of the energy from the combustion of #"1.00 g"# of acetylene, #"C"_2"H"_2(g)#? (Every mole of acetylene releases #"1300 kJ"# of energy when combusted.) What quantum numbers defines a shell? Question #ba81d Question #ff7d2 Question #dbcc5 Question #cf4ad If I hold a 5-cm piece of copper wire over heat until it glows red/then allow the wire to cool/inspect it once again. Then would I classify it as a physical change or chemical change??? Question #a6874 Question #49c69 Question #7ddac Question #f678c Question #08486 Question #97f68 Children's Liquid Motrin contains 100. mg of the pain reliever ibuprofen per 5 mL. If the dose for a 75 lb child is 2.5 teaspoons, how many grams of ibuprofen would the child receive? ( 1 teaspoon = 5 mL.) Question #caa00 Question #a75a9 Question #c4efb Question #8cfbe Question #82e0b Question #881bf Question #09254 Question #bd0e4 Question #1df79 How is CO2 the reactant in excess in this problem? Question #50375 Question #2daab Question #12836 A 0.0182 g sample of an unknown substance was dissolved in 2.135 g of benzene. The molality of the solution as determined by freezingpoint depression was 0.0698. What is the molecular weight of the unknown substance? What kind of salt bridge do you normally find in a galvanic cell with Ag and Zn electrodes? Also, what solution would you put the electrodes in? First ionization energy of hydrogen atom= 2.18 aJ (attojoules). What the frequency and wavelength, in nanometers, of photons capable of just ionizing hydrogen atoms? When glucose undergoes fermentation, ethanol and carbon dioxide are formed. #"C"_6"H"_12"O"_6 -> 2"C"_2"H"_5"OH" + 2"CO"_2#. Calculate the mass of ethanol that could be obtained from 25 g of glucose? Balance the redox equation occurring in acidic solution. #H^+(aq)+Cr(s)-> H_2(g)+Cr^(3+)(aq)#? Please help, thanks. How does water's polar nature affect its ability to dissolve a variety of substances? Question #efa5f How many grams of NH3 can be produced from 2.44 mol of N2 and excess H2? Question #e48ce Which of these pairs of molecules have similar shapes? Question #5f85c Which molecule has the strongest intermolecular force ? • BF3 • NH3 •H2 Question #b9ca6 How many orbitals do you think exist in a atom? How do we represent the formation of zinc oxide by the method of half equations? Question #2c09e Question #1250f Question #a3754 Question #e24af Can someone please double check if I have oxidised the number of sulfur correctly for the following ions? The question is in the description box below. Question #04df9 Question #5f1df What is the percentage metal content of calcium oxide? Why do we use the unit g/mol for the mass of an element? Question #e249b Question #f3a82 Question #4f280 Question #15d26 Question #11d99 Question #fc960 Question #d0748 Question #25ac0 Question #45536 Question #8f47e Sulphur molecule contains 8sulphur atoms .so mass of one mole of sulphur must be 8×32=256 is it correct.? Question #f7e13 If ionic bonds form after transfer of electrons and covalent bonds form through sharing of electrons, how do metallic bonds form? Vitamin C has an empirical formula of #C_3H_4O_3# and a molecular mass of 176. What is the molecular formula of Vitamin C? Explain the electrolysis of water? Question #681af Question #ae277 If there is a #2*mol# quantity of dimethyl sulfoxide, how many moles of carbon are present? What are the oxidation numbers of #4HNO_3 (aq)#? Question #d21ae Question #30c07 A 3.00-L flask is filled with gaseous ammonia, NH3. The gas pressure measured at 20.0 C is 2.55 atm . Assuming ideal gas behavior, how many grams of ammonia are in the flask? Question #b6f1e Question #6430b Question #62f24 Question #e3585 Question #8ff20 Question #f6271 Question #be1b2 In the following reaction, what is reactant being oxidized? Question #62fc5 Question #bde90 What is the mol solute and molarity of #KNO_3# which has the solute mass 22.5 g and volume solution 125.0 mL? Question #4cb99 How do I calculate Kp for C+CO2=2CO given the following reactions? C+2H2O=CO2+2H2 and H2+CO2=H2O+CO. What percent of #"HIn"# (#"pH"# range of #2.60#) is in the buffer solution in order to see only the acidic color of the indicator, if the acid-base ratio to see the acidic color is equal to the base-acid ratio to see the basic color? Question #f033d How many milliliters are in 1.00x10^-2 liters? Why does alcohol expand more than mercury? Question #a24ca Question #fabee What is the empirical formula of a compound that is 26.58% K, 35.35% Cr, and 38.07% O? Stoichiometry - If a silver spoon has 0.0030 moles of tarnish on it, how many moles of H2S was it exposed to? Question #9682b Question #e052d Question #49b39 Question #e0318 When 3.94g of hydrated copper(II) sulfate crystals were heated, 2.52g of the anhydrous salt remained, calculate the formula of the hydrated salt? Question #6bd6d Calculate the mass of NiSO4 present in 200mL of a 6.00% solution of NiSO4.The density of the solution is 1.06g/mL at 25°C? Question #0d94b Stoichiometry - When 21.3 moles of C3H8 burn in excess oxygen, how many moles of CO2 will be formed? Assume this is complete combustion. Here is the chemical reaction - Ca(NO3)2 + (NH4)3PO4 --> Double displacement follows... If you start with 10.25 mL of .553M Ca(NO3)2 soln, how many moles of calcium nitrate do you have in the soln? Also a part 2 in the question. What is the meaning of ''the desired pH adjusted using drops of 2 N HCl and 2 N NaOH'' ?as I would like to do the same recipe to adjust my ph of glucose. Any advice is appreciated, Thank you in advance, An electron traveling at #5.6 xx 10^5 "m/s"# has an uncertainty in its velocity of #2.64 xx 10^(5) "m/s"#. What is the uncertainty in its position? Question #1a49e Question #8b78e Question #76484 Question #420ac What mass of AgBrO3 can be dissolved in 50.0 mL of 0.500M NaBrO3 at 80°C? Question #181f6 What is a good primary standard for use in acid-base titrations to determine equivalence? Question #3d134 Question #9dba0 How to calculate the anhydrous ammonia, from Kg to normal cubic metre in the gas state? What is the maximum #["CO"_3^(2-)]# that can exist in a saturated solution of AgBr? Question #4d524 Question #60e5e Question #5da2c Zinc metal reacts with HCl solution to produce ZnCl2 and H2 gas. What is the volume (in mL) of 0.470 M HCl is required to react with 0.15 g of Zn metal? Thermochemistry: Use the equations to answer the question.? Question #7213b Question #0b569 Question #626b6 Question #a75e0 Question #cc1e5 Question #473d3 Question #f081d Question #72937 Question #ddc2b Question #39f4c A 100-gram sample of #H_2O(l)# at 22.0°C absorbs 8360 joules of heat. What will be the final temperature of the wild? Question #1fc49 A #0.252*g# mass of #"oxalic acid"# is titrated with a #41.35*mL# volume of #"sodium hydroxide"#. What is the concentration of the sodium hydroxide solution? Question #ca262 Question #6be07 Question #fd97b Question #8db29 Question #e82a0 Question #7c5e7 Question #c9777 Question #8e229 98.6°F is what in Celsius? Question #2ac40 Question #a1516 For #CCl_4#, #SiCl_4#, #PbCl4#, and #PbCl2#, which species exhibits the GREATEST ionic character? Question #705cb Question #39d3b Question #1c66c Question #b42ef Question #7d801 What is the ionic equation of lead(II) nitrate reacting with potassium chromate(VI) to form #PbCrO_4#? Question #91e50 How do you round 24982 to 2 significant figures? Question #02d46 Question #dec53 Question #69298 Question #c5e59 Question #e70b0 Question #85ab1 Question #d2b73 Question #fd5e9 If 1.00 mol of argon is placed in a 0.500-L container at 23.0 C , what is the difference between the ideal pressure and the real pressure? Question #c21cf Question #520ff Question #68523 Question #2296d Question #c3e5d Consider the reaction: Cl2(g) + 3 F2 (g) = 2 CIF3 (g) Complete table? Question #c9b0f Question #a1c50 Question #39583 Question #b2435 Question #fd1e0 What is an aromatic, heterocyclic base containing oxygen? Calculate the molarity of a solution made from 125g of CaCl2 in 175mL of solution? KMnO4 oxidises #X^n+# to #XO^(3-)#, itself changing to Mn2+ in acidic medium. 2.68x10^-3 mol of X^n+ require 1.61x10^-3 mol of KmnO4. The value of n is? Balancing Redox Reactions. Balance the basic solution (ClO3)- + MnO2 = Cl- + (MnO4)- using half reaction? Balancing Redox Reactions. Balance the acidic solution of MnO2+ Cl- = Mn+2 + Cl2 using half reaction? Question #909f2 When mixing AgNO3 and NaSO4, will some precipiate be formed? Because when I mixed them I got nothing. Question #fd7fd Question #15ad0 Question #4f738 What is the formula mass of #Mg(NO_3)2#? What mass of carbon dioxide will be generated from complete combustion of an #80*g# mass of ethane? Question #dd080 Question #efd71 Question #f535d What is the oxidation state of #Cl# in #HClO_3#? Question #ae3d0 What are the differences between homogeneous catalyst and heterogeneous catalyst? Question #6b59c Question #f9b3b Question #f3813 If the pressure in a reaction vessel for the following reaction is increased by decreasing the volume, what will happen to the concentrations of CO and CO2? #H_2O (g)+ CO_2 (g) rightleftharpoons H_2 (g)+ CO_2 (g)+heat# Chemistry question? What is the concentration of a solution prepared by mixing #500*mL# quantities of #(i)# #"30% sulfuric acid (w/w)"#, and #(ii)# #"50% sulfuric acid (w/w)"#? #rho_"each solution"=1.218*g*mL^-1, 1.610*g*mL^-1,# respectively. Question #fac84 Question #50d0b What is the difference in structure of SO3 and SO3^2-? What colour change does phenolphthalein undergo in nitric acid? What occurs when nitric acid is added to water? What colour is universal indicator in nitric acid? What reaction does nitric acid undergo with sodium carbonate? Question #819e0 Question #e7eb1 Why can we not figure out the number of valence electrons in transition metals? Question #0ac24 Question #8ced0 Question #86e1b Which of the following is a weak electrolyte in aqueous solution? A) HF B) NaF C) HCl D) KCl Could someone please explain why the answer is HF, thank you so much! 15.0 moles of gas are in a 6.00 L tank at 24.3 C . What is the difference in pressure between methane and an ideal gas under these conditions? When 20.0 g of sodium fluoride is dissolved in water to prepare the total volume of 200.0 mL solution, what is the molarity of the solution? Question #20ae5 How do you do ppm (parts per million) calculations??? Question #e367b What is the molecular formula of a compound with a molar mass of 260.50 g and an empirical formula of SnCl4? Why are the bond angles in ammonia, water, and methane similar? Including: # of particles, temperature, average kinetic energy, molar mass, average velocity, electronegativity and atom size, which of these are the same or different for all of the elements? What is the mass of a #374*mL# volume of ethylene glycol? Complete the following reactions.? 1. Na2O + H2O --> ------- ? 2. ---------- + ------------ --> H2CO2 ? Do protons, neutrons or electrons have the smallest mass? I want to learn "Quantum chemistry" Can u suggest any kind of lectures That helps me to learn it Also it should provide me interst on chemistry Please suggest a way of learning ?? Why does oxygen have a -2 oxidation number? (usually) Question #3799a If a concentration of HI increases from 0 to 0.001 moldm-3 in 50seconds, what is the rate of reaction? How does molar mass depend on temperature and pressure? Question #1880e Question #da4bd Write the values of all four quantum numbers for 15th electron of sulphur? Question #0d3e8 Question #c6f9d Question #c5653 Given a wavelength of 1500 nanometers, how much energy does the wave have? What type of radiation would this wave be? 4FeS2 + 11 O2 Õ 2 Fe2O3 + 8 SO2 Given 75.0 grams of FeS2, how many grams of sulfur dioxide are produced (MM in g/mol: FeS2=119.99, O2=32, Fe2O3=159.7, SO2=64.07) ? 40.0. g 70.0 g 150. g 80.0 g Question #e8697 What is solute mass and mol solute of #NaHCO_3# which has the volume solution 250.0 mL and molarity 0.100 mol/L? Question #c13d2 Question #ceeba Question #bc1b9 Question #dc602 Question #04114 Chlorine gas + aqueous calcium iodide produces what? Given the balanced equation: 2Na+S=Na2S What is the total number of moles of S that reacted when 4.0 moles of Na were completely consumed? Is the nucleus and neutrons both the same thing in an atom? If not, what's the difference? Question #42b7a Question #c4226 Calculate the concentration of Cl- remain in solution? Most of us associate 35,000 feet (~10,600 meters) as the height that commercial jets fly. What is the pressure outside of a jet flying at 35,000 feet? How about the temperature outside of that same jet? How do we choose suitable indicator for titration of weak acid with strong base? KF has NaCl structure. What is the distance between#K^+#and#F^-# ions in KF, if density is 2.48 #g//cm^3# ? (1) 537.5 pm (2) 268.8 pm (3) 155.3 x 10 cm (4) 5.375 cm A first order reaction is found to have a pre-exponential or 'frequency factor' A of 6 x 1012 s-1. The activation energy for the reaction is 93 kJ mol-1. Calculate the magnitude of the rate constant for the reaction at 298K? If 15.5 grams of aluminum, wit an initial temperature of 25.0 degrees Celsius, absorbs 155 joules of heat energy, what will be its new temperature? Why is vaporization endothermic? Why is condensation exothermic? Question #3dbe1 Can someone please explain to me in detail how to balance this unbalanced equation?: #I^(-)(s) + H_3AsO_4(aq) -> IO_3(aq) + AsO_3 (aq) +H_2O (l)# What is the number of Oxygen atoms in one mole oxygen gas molecules? Question #b59db Question #015dc Using this balanced equation in order to produce 7 moles of oxygen gas, how many moles of water would you need to start with? 2H2O -- > 2H2 + O2. Find the de broglie wavelength of hydrogen atom at a temperature 303 K? Question #22ff5 Question #b7bb3 Question #2570b What is the molar quantity of #SO_2# in a #1.0*dm^3# volume of same at a temperature of #300*K#, and a pressure of #740*mm*Hg#? Question #012f8 How many coordinate bonds are present in SO3? Question #083d0 How many moles of O2 in 32.0 grams of O2 gas? Question #0ca92 Question #1cbba Question #cb371 Question #64391 Name one chemical property of carbon monoxide and link it to one of its health or environment affects? A sports-utility vehicle has an average mileage rating of 17.00 miles per gallon. How many gallons of gasoline are needed for a 395.0 -mile trip? Question #4936e In a salt solution, which species (cation/anion) is responsible for the absorbance spectrum? Question #19b20 With a mass of 21 mg and a density of 0.728 g/cm^3. What is its volume in cubic centimeters? Is a 1994 penny a pure element? Does copper or zinc have a higher melting point? What is their relative melting point? How many moles of O2 in 40.0 grams of oxygen gas? What are the appropriate techniques for weighing, filtering, and drying a precipitate? Question #4ddaa Percent of element in the original impure sample? How is the autoprotolysis of water represented? Question #ee143 Question #fa899 Question #80b96 Question #6d6cb Calculate the percentage by mass of each element in the following compound? 1. Based on the measured molality of the solution, what is the solvent mass in kg? 2. How many moles of water is that? 3. How much water remains in the solid? 4. Based on the results of (c), suggest a composition for the residual solid. What is the standard entropy of the reaction below at 25 degrees Celsius? H2O(g) + C (graphite, s) --> H2(g) + CO(g) Question #051ae Which of the three fertilisers ammonium nitrate NH4NO4, ammonium sulfate (NH4)2SO4 and urea (NH2)2CO contains the highest percentage of nitrogen? A sample of gas has a particular volume at #0^o# #C#. To what temperature must it be heated, if the pressure is kept constant, to double its volume? What is the final temperature of both the weight and the water at thermal equilibrium? Express the temperature in Celsius to three significant figures. Question #8590a Question #5f4d5 Question #9c660 Question #707fe Question #7b48c Question #8a179 Question #e98af What is the mole fraction, X, of solute and the molarity m, for an aqueous solution that is 16.0% NaOH by mass? How does electronegativity vary amongst elements of the Periodic Table? To a 50 mL of 0.05M formic acid how much volume of 0.10M sodium formate must be added to get a buffer solution of pH 4.0 ? (pKa of the acid is 3.8) (1) 50 mL (2) 4 mL (3) 39.6 mL (4) 100 ml. Question #a4a33 8.40g of NH4Cl is added to 10.6g of water. Calculate the molarity of the solution? What is the molar quantity of a #79.0*g# mass of ammonia? Question #189c5 Question #50739 Question #c92c5 How many moles of magnesium atoms are there in 0.2g of the metal? Is functioning group and homologous series the same thing? Why are polar substances soluble in water? Question #59977 An atom contains 11 protons and 11 neutrons. What is the nuclide symbolism for the nucleus? Here is the chemical reaction - Ca(NO3)2 + (NH4)3PO4 --> Double displacement follows... If you start with 10.25 mL of .553M Ca(NO3)2 soln, how many moles of calcium nitrate do you have in the soln? Also a part 2 in the question. Question #869a7 Question #c9bfb How can we prove that #|m_l| <= l#, i.e. that the magnetic quantum number can be no bigger than #l#, and no more negative than #-l#? Question #086c8 Question #1f986 Question #7bf2e Question #7dcf4 Methane (CH4) has a boiling point of −164°C at 1.00 atm and a vapor pressure of 42.8 atm at −100°C. What is the heat of vaporization of CH4? Question #3d3a3 Question #3feb7 Question #770b7 Question #397cb Question #9db4a 5-7 complete the following reaction.? 1. Zn + H2O Õ ZnO + H2 ? Question #348ab Question #66828 Question #787b9 Gaseous chlorine atoms would then react with gaseous ozone (#O_3#) to form gaseous chlorine monoxide and gaseous oxygen. Write the balanced chemical equation for this reaction. How do I do this? Question #60c07 Question #9948d What mass of carbon dioxide is present in 1.00 m3 of dry air at a temperature of 21 C and a pressure of 649 torr ? How to Calculate the Number of Tin Atoms in a Can? Question #ce70b How many oxygen ATOMS are present in a #28.9*g# mass of #"dioxygen"#? Question #964eb What are positively charged subatomic particles called? Question #dafa8 Question #c6097 Question #f33a3 How do impurities lower the melting point of a pure substance? Question #601b3 Question #82c0a Question #bde9b Question #70c5e Question #02757 Question #90195 Question #82a90 Question #4f48c What is #"quicklime"#, and how does it react with water? What are the intermolecular and intramolecular forces in ibuprofen? How to know valencies of elements of variable valencies in a compound? Ex - lead oxide Here what should we take valency of lead? Question #7335b Question #ed9b1 Question #1b2a6 Question #e70ce What causes the pH of a solution to increase? Question #b7f79 Question #e4dfd At what pressures is the Haber process best? Can someone help me answer this question about melting of crystalline solids? Thanks! A penny has a thickness of approximately 1.0 mm. if you stacked Avogadro's number of pennies one on top of the other on Earth's surface, how far would the stack extend in km? A drop of water has a volume of approximately 0.05 mL. How many water molecules does it contain? The density of water is 1.0g/mL. Question #a4303 Question #3f297 Which has a higher #pH# value : #0.01 M# #NaOH# or #0.1 M# #NaHCO_3#? Question #687ac Question #e460d Question #4e3c8 Question #13ef4 Question #236e1 How is octane completely oxidized? Question #7458c If Strontium-74 is unstable what type of decay does it undergo? What type of radioactive decay would Hydrogen-3 undergo and why? d_z2 orbital participate in sp^3d hybridization and not any other d-orbital.why? Question #52fc8 For the equilibrium #CuSO_4. 5H_2O(s) rightleftharpoons CuSO_4. 3H_2O(s) + 2H_2O(g)#, #K_p = 2.25*10^(-4) atm^2# and vapour pressure of water is #22.8# Torr at 298K? Question #bc581 What types of elements will most likely form an ionic bond? what types of elements will most likely form an covalent bond? Question #f77f2 Question #028c4 Question #15818 Question #c7f3f A pure sample of the solvent phenol has a freezing point of 40.85 C. A 0.414 molal solution of isopropyl alcohol in phenol was observed to have a freezing point of 38.02 C. What is the freezing point depression of this solution? How many isomers of #C_5H_11OH# will be primary alcohols? Give their structures too. Question #29db0 What is the charge of O2? Caffeine, #C_8H_10N_4O_2#, is a stimulant found in tea and coffee. A sample of the substance was dissolved in 45 g of chloroform, #CHCl_3#, to give a 0.0946 molar solution. How many grams of caffeine were in the sample? Question #79539 Heat packs contain #MgSO_4(s)# and a blister of water. Use chemical reactions to explain their mode of action? Question #c6a11 What is the concentration of a solution in parts per million if 20.0 grams of Na2S is dissolved in 4.00 x 10^5 grams of water? Question #5606d How much magnesium chloride is required for a #0.250*L# volume of #MgCl_2(aq)# whose #"molality"# is #0.250*mol*kg^-1#? Question #33c99 What is the VSEPR shape of #(SO_4)_2?# Question #cd90f An object made of me is light enough to float in corn syrup, but not in water. What am I? Question #c5f79 Question #85b0f Question #f1b54 Question #4282b How would you make 500 mL of a 2.00 M sodium hydroxide solution? Question #4e20b Question #981f2 Question #844e5 Question #b7c56 Question #48549 Question #e1c46 Why are most solids more dense than liquids, and why is water an exception to this? Question #5ead4 What separates metals and non-metals with respect to the Periodic Table? Would MgO or NaF have the larger lattice energy? justify your answer Why is the distance between the ions smaller in MgO than in NaF? Do we write net ionic equations only when there is a solid in the products? Balanced: Mg (s) +2HCL (aq) --> MgCl_2 (aq) +2H(g) Is it possible to write the net ionic of the formula above? If yes what would it be? Question #6362b Question #a54a1 How to write the chemical formula for : ? 1) gold(III) acetate 2) tungsten(VI) bromate Question #5954a Question #af9fa How would the molecule below be named based on IUPAC naming? A solution contains 81 g of sucrose (C12H22O11), a nonelectrolyte, dissolved in 274 g of water. What is the boiling-point elevation? Convert 7.03 x 1012 nm3 to mm3? Question #63ecb A compound has an empirical formula of CHO2 and a molecular mass of 135 g/mole. Determine the molecular formula? 5) At STP, 33.6 L of hydrogen gas is used to saturate 24 grams of a #"C"_2"H"_4# and #"C"_2"H"_2# mixture. What is the mass percentage of #"C"_2"H"_4# in the mixture? (C:12, H:1) A substance has a density of 4.72 kg/dm3. What is its density in g/cm3? Balance the following reaction: #"__Fe +___NaBr"##rarr##"____FeBr"_3 + "___Na"#? Question #54ff3 Question #0ddbd If the boiling point elevation of an aqueous solution containing a non-volatile nonelectrolyte is 0.48C, what is the molality of the solution? What mass of magnesium contains the same number of atoms as 7g of iron? How many atoms are there in 0.36g of magnesium? What is the percent by mass of oxygen in propanal, #CH_3CH_2CHO#? What is the formula unit of sodium nitride? Question #39aec Do aqueous solutions of alkalis contain hydrogen or hydroxide ions? A solution containing 3.8mg/100ml of compound B whose molecular weight is 280g has a trasmittance of 39.6% in a 1cm cell at 480nm. Calculate molar absorptivity of compound B? The below are oxidation reactions. Explain why? Question #fa047 Question #c0fe6 Question #a8d0e Question #6c00b Name the following compounds??? To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 3.5-L bulb, then filled it with the gas at 1.40 atm and 30.0 C and weighed it again. The difference in mass was 5.5 g . What is the gas? What is the effect on the equilibrium composition of the liquid when the partial pressure of CO2 gas above the liquid is decreased? Which of the compounds, NaF or MgO, would be soluble in water? justify your answer. A #10.71*g# mass of an iron oxide contained #7.50*g# of metal; what is its empirical formula? Question #ccc4f Question #07c8e Question #62c6b Silver emits light of 328.1 nm when burned. What is the energy of a mole of these photons? Question #873be Question #aa0f1 Question #18e57 Question #37625 What is meant by the self-ionization of water? Question #d6cdb Question #dee61 Question #3fec9 How many quantum numbers are there? Question #c2a3b Question #888ce Question #8f8f8 Question #b898d What's the electron configuration for Oganesson? Atomic number-118 Question #2a98a Question #d6f65 Question #1633e What is the molar quantity of a #0.500*g# mass of aspirin, #C_9H_8O_4#? What is the mass of 62.0 mL of ethanol? The density of ethanol at room temperature = 0.789 g/mL? Why is a reaction spontaneous when Delta G < 0? A chemist needs 35.0 g of concentrated sulfuric acid for an experiment. The density of concentrated sulfuric acid at room temperature is 1.84 g/mL. What volume of the acid is required? Question #9f42b Question #0d713 Does sodium dissolve in water? Question #482aa Question #dc5fb What are the products when zinc metal reacts with sulfuric acid? Question #f3b2f Question #829e7 Question #578af Question #81b79 The densities of three aliquots of an unknown solution were found to be 1.028 g/mL, 1.043 g/mL, and 1.039 g/mL. Calculate the average density of this unknown solution? Use the tabulated density of water at 17 degrees celsius to calculate the theoretical mass of water (in grams) that should be delivered by a #"10.00 mL"# pipet? Density of water at #17^@ "C"# #=# #"0.998778 g/mL"# Question #70e06 Question #f42b3 Question #a4bd1 A gas is filled in a vessel of volume V at 35 degree centigrade.To what temperature should it be heated in order that half of the gas may escape out? Question #cfb37 Question #b84dc Question #95789 What is the density of vinegar? Do all covalent compounds have low melting point and boiling point?? Question #3a334 Question #aebeb How much pure acid is in 440 milliliters of a 16% solution? Question #b8544 What is the abundance of #""^18O#? Question #7a955 Question #1e01f Question #d8f9e What is the molarity of a HCl solution that contains 14.2 g of HCl in 182 mL of solution? Question #3d791 Question #bdc2a Write the reaction mechanism for the following process: #Na_2S_2O_3+2HCl=2NaCl+S+SO_2+H_2O# Justify , based on the mechanism of the reaction , the role of HCl as a catalyst(?). Question #be3c7 Question #a895a Question #0cbe1 Use the half-reaction method to balance the following redox reaction in acidic solution: As2O3(s) + NO3(aq)- ---> H3AsO4(aq) + N2O3(aq) How do you balance a redox reaction in acidic conditions? Question #a42f7 Question #e3eb0 Question #f5f5f How many grams of potassium chlorate are required in the preparation of 90.0 cubic decimeters of oxygen? Question #a1e64 For which of the following reactions is ΔHrxn equal to ΔHf of the product(s)? Question #c97a5 What are the phosphorus oxidation numbers for phosphorus in #H_3PO_4#, and #P(OH)_3#? Question #f2df8 Question #3f946 Calculate the density (in g/mL) of a 10.00 mL aliquot of unknown solution that has a mass of 12.965 g? Question #decd0 Question #98b35 Question #85252 Question #b3ab1 Question #66474 Question #6a759 Question #0f309 Question #27f18 What is the expected boiling-point elevation of water for a solution that contains 216 g of sodium chloride dissolved in 1.0 kg of water? Question #86713 How does gaining or losing thermal energy affect water? How to calculate amount of NaCl needed? Question #4a9b7 Question #125c1 Question #a08a7 Question #4cd90 Question #6b900 Question #d4199 What is the name of the physical state of mater which can change its shape but not its volume? Redox Reaction Help? Question #0dc23 Question #473ca Question #52602 Question #25934 Question #93411 Question #82684 Question #24450 Question #88c15 A compound of carbon, hydrogen, and oxygen was burned in oxygen, and 1 g of the compound produced 1.418 g #CO_2# and 0.871 g #H_2O#. (Question below?) Question #d2fba Question #7a17e Question #c9ba9 Can #1/2H_2# be considered as a single hydrogen atom? When1.42g of iron reacts with 1.80g of chlorine, 3.22g of FeCl2(s) and 8.60kJ of heat is produced.What is the enthalpy change for the reaction when 1 mole of FeCl2(s) is produced? Question #b6f49 A helium filled balloon has a volume of 208 l and it contains 9.95 moles of gas. If the pressure of the ballon is 1.26 atm determine the temperature in Celsius degrees? Question #44378 Question #5f1e8 What is the increasing order of strength of oxy acids of Chlorine? What is ΔHrxn for the reaction below? I thought the answer was -109 kJ but it was wrong. Question #9dcc4 Question #b47fe Question #59cb8 What is the pH of a solution prepared by dissolving 1.23 g of 2-nitrophenol in 0.250L? pKa=7.00 Identification of a ion from the highest energy line in its emission spectrum? Question #7d63d Pressure over #1000ml# of a liquid is gradually increased from #1# bar to #1001# bar under adiabatic conditions. If the final volume of the liquid is #990ml#, calculate #DeltaU# and #DeltaH# of the process? Question #89bd9 Question #7d7ee How to find molality? Which of the molecules below has the highest boiling point? Question #3570b A sample of 1.00g of potassium carbonate is dissolved in 100mL water. A titration of this sample requires mL of nitric acid to reach the endpoint. What is the concentration of the Nitric Acid? Find the value of x? Question #5f7b6 Explain the equilibrium between #"Co"("H"_2"O")_6^(2+)# and #"CoCl"_4^(2-)#? Question #a5630 Question #fbc4f How do we represent the atomic particle with 24 nuclear particles, 12 of which are positively charged, and with 10 charged extranuclear particles? Question #8d1bc Question #e9b5a Question #d668c Is lithium reactive? How do you know on the basis of electronic structure? Question #670b6 Question #ae66d Question #af78a Question #83bcc Between HF and CO2 which has a stronger hydrogen bond? explain Question #28586 Question #87a25 What is the effect on the concentration of Fluorine when stress is added to this equilibrium system? Question #3bd38 Question #990a5 Question #7f216 A dilution of a 1.0 M NaOH solution was carried out as follows: 10.7 mL of the 1.0 M NaOH soution was diluted with distilled water to a total volume of 284 mL. Calculate the molarity (mol/L) of the diluted solution of NaOH? What are the electrons found in the outermost energy levels of any atom or molecule called? What is a consequence of electron pair repulsion around an atom? Question #4371a What is the overall charge of an ionic compound (formula unit)? Question #5e2da Question #42223 What is an example of a chemical clock reaction (see description)? Question #e37da Question #2acaa Question #6afe6 Question #75a03 Question #599b0 Question #f0a16 Question #0c988 Question #d87eb Question #cd83b How many moles of oxygen gas will occupy a volume of 2.5 liters at 1.2 atm and 298K? Question #f9b1e Question #cc3b6 Question #14b66 Question #15994 Question #68d37 A rock weighing 30.0 g is placed in a graduated cylinder displacing the volume from 22.3 mL to 27.6mL. What is density of the rock in grams/cubic centimeter? Question #e4e08 Question #9f5d7 Question #efc8b Question #05624 Question #39ce7 Question #0e371 Question #00d64 Question #5b15f Question #ee5e0 Question #73891 A concentrated HCl solution is described in the bottle as containing 36%(mass by volume) of HCl.what is the molar concentration of this volume? Question #9dc46 Question #19595 A reaction produced 5 moles of moles of O2. Predict how many moles of KClO3 will react given the following equation. 2KClO3 --> 2KCl + 3O2? Question #02c88 Question #021c6 Question #02fb9 Question #777f6 What is the value of #gamma# for a polyatomic gas? Question #13426 Question #51c8f What is #pK_a# for an acid, for which at #0.085*mol*L^-1# initial concentration, has a #pH=2.68#? Question #0cc6c What is the concentration of ferrous ion? Question #258c2 Order in the increasing order of acidity:HCl, H2SO4, HF, HCl, HI, HBr, HNO3, HBrO, HClO, HClO3, HClO4, H2S, H3PO4(?) Question #3d127 What is the mass of #CO2# formed when 1.00kJ of energy is released? Full question in the description box below as an image. Question #83d9d Question #78578 Question #dabf4 Question #fc3ee How do we make a #1*L# volume that is #0.50*mol*L^-1# with respect to #HCl# starting from a #36%# #m"/"m# solution of hydrochloric acid, for which #rho=1.18*g*mL^-1#? Question #7c132 Question #9795e Question #446f1 Question #c4ffa Question #4cba9 What is Hrxn? Question #64917 Question #648a7 Question #47912 Question #ffa3a Question #9b006 What is the wavelength of an electron traveling at #5.01 times 10^5# #m##/##s#? In the equation, Fe2O3 + 2Al Õ Al2O3 + 2 Fe, if 52.6 g of aluminum are used with excess iron oxide, how many grams of Fe2O3 will be converted to aluminum oxide? Question #1dab9 Coal contains small amount of sulfur. What are the implications of this small amount of sulfur for stations generating electricity busing the combustion of coal? Question #289df What is the atomic number of chlorine? Although hydrogen has the smallest molar mass, helium has the lowest boiling point.Why? Question #04fe5 What is the ΔH value for this thermo chemical equation? Full question in the description box below. Question #db360 Question #753b1 Question #7b62a Question #c4dc5 Question #84a40 Question #b80c7 Question #cabac Question #5321e Question #f8706 Question #7f3eb What is the change in enthalpy for this gas-phase reaction between potassium and bromine? Question #2a8a3 Question #df012 For a spontaneous process in an isolated system, the change in entropy is positive. Why? Why not? Explain Fajan's rules? Why are elements with electron configuration #(n−1)d^n ns^0 np^0# more polarizing in nature as compared to the cations having noble gas electronic configuration #ns^2np^6#? Question #88885 Why is rhenium frequently used as a catalyst? What properties does it have that lend to it being a good catalyst? Question #81452 Assign the oxidation numbers to all the species of this reaction and indicate whether it is an oxidation reduction reaction? Question #4e4cc Question #ec161 Question #70826 Question #5a7f8 Question #3617b How much rust can be produced by a #3.37*L# volume of oxygen gas at room temperature and pressure? How do we prepare a one litre volume of solution that is #"20 ppm"# in sodium ion, from sodium carbonate? Question #99100 What species is conceived to DONATE electrons in a redox reaction? What is the electronic configuration of sulfide ion? How do you represent the reaction between #"ferrous sulfide"# and #"hydrochloric acid"#? Question #080ff Question #a361c Question #30fdf Question #8688d Question #4cb9f In the equation: 4NH3 + 5O2 Õ 4NO + 6H2O, 310 g of O2 will react with 175 g of NH3. What is the limiting reactant? What is the theoretical yield of NO, and if 197 g of NO are produced, what is the percent yield? Find out Volume of #H_2#? Question #c21c2 Write a net ionic equation for the following: Acidified solutions of sodium dichromate and copper (I) bromide are mixed? Question #08e6e Question #3979f Question #9cf38 Question #efef5 Question #cf79e A) predict the products and write the balanced equation including states of matter b) state the type of equation? SODIUM CHLORIDE Question #244c0 Question #01c42 A wood fire burns at 260 °C. What is the temperature in Fahrenheit? (Balanced) Equation- 2NaOH + FeCl2 (react to produce) 2NaCl + Fe(OH)2 Question- If 12.75g of NaOH and 20.20g of FeCl2 reacted to produce 18.63g of NaCl, how much Fe(OH)2 was produced? Question #e938d Question #0697f Question #76d79 How to calculate the density of this crystal? Question #427be What is the mass of a #73*mL# volume of water? Question #9b1f0 Question #ba9da Question #396bc Question #57ddc Question #09b88 Question #35197 Question #5bf4a Question #8cf3a Question #05a9c Question #0d59e Question #73675 Question #da3dd Question #6319c Question #481c7 Question #8bc66 What is the heat capacity #C_(cal)# of the dry calorimeter device? Question #17066 Question #c8ed7 Question #874b4 Question #ceb36 Question #21805 An electron at rest is released far away from a proton, toward which it moves. (a) Show that the de Broglie wavelength of the electron is proportional to#sqrt (r) #, where r is the distance of the electron from the proton.? Question #65957 How would we compare the electronegativity of methane to that of ethylene? How do you work out the oxidation number of an element in a compound? E.g finding the oxidation number of the element Cr from the compound #Cr2O3# Question #80d8e Why is a hazard warning label yellow and black? Question #a3013 What is the energy produced per tonne of #CO2# released for each fuel? Question #8fbed Question #d521e Addition of 1kg of non volatile solute in volatile solvent increases the boiling point from 350K to 355K and decreases the freezing point from 250K to 220K.If Kb is 15.5KKg/mol,then Kf will be? Question #feeb3 What occurs when butane leaks from a cylinder? Question #8f2fc Question #72f8f Question #8b15c Atoms are the smallest part of what? Question #f31ae Question #ef64c A ketone has the molecular formula C5H10O. Write the structural formulae of the isomers to show positional isomerism? How are ions formed? Question #5f1dd Question #0c711 Question #3adf4 Why binding energy (Mettalic bond ) of Mn is less than Cr?? Question #1246e Give a brief description about ortho effect with example. (?) Why are all hydrogen atoms not identical? Question #d78e3 What happens to the pH of a solution when the solution is diluted 2 times? Question #5b427 Question #5ecab Question #65ccb Question #6429b Question #2537e Question #eb4af Question #5c699 Why we use basic KMnO4 to oxidize organic compound?? Question #69929 Question #ead66 Question #01778 Which of the following compounds is in a distinct category? #"a. " AgCl; "b. " CaCO_3; "c. " CaF_2; "d. "FeS_2; "e. "HClO_4# Which species contains only covalent bonds? A 75 mL solution that is 0.10 M in HC2H3O2 and 0.10 M in NaC2H3O2 has a pH of 4.74. Which of the following actions will change the pH of this solution? Question #c9296 What is an example of a reaction that produces gas (see description)? Question #b8a77 30.0 mL of 0.10 M Ca(NO3)2 and 15.0 mL of 0.20 M Na3PO4 solutions are mixed. After the reaction is complete, which of these ions has the lowest concentration in the final solution? What is an example of a reaction that produces gas? Question #62e5a A 150.0-mL sample of a 0.5000 M KCl(aq) solution was diluted by the addition of 150.0 mL of distilled water. Calculate the molarity of the diluted solution? The heat of hydrogenation of ethene is #x_1# and that of Benzene is #x_2#. Hence resonance energy is? Question #e7673 Question #f32f0 Question #4b48d A gas mixture #3.67L# in volume contain #C_2H_4# and #CH_4# in proportion of #2:1# by moles and is at #25^oC# and 1atm. If the #DeltaH_c(C_2H_4)# and #DeltaH_c(CH_4)# are #-"1400 kJ/mol"# and #-"900 kJ/mol"# find heat evolved on burning this mixture? What is "the thing" in the structure of a compound that decides if it is going to be soluble in water or not? Question #4f81d The standard enthalpy of formation of #H_2(g)# is zero. But sometimes we do write( which is also given in my book) #2H(g) -> H_2#; #DeltaH = -"435 kJ/mol"#. This surely suggests that the enthalpy of formation of #H_2# is non-zero? Question #44152 Bond enthalpy question? Question #5c0eb Question #40578 Question #54de0 Question #4de72 Question #be4c4 Question #9ac41 Question #0406d Question #1632e Which of the following solutions that does NOT undergo ionization in water? #a.# #"Sodium bromide;"# #b.# #"ferric chloride;"# #c.# #"calcium chloride;"# #d.# #"ethanol."# Question #d339a Question #7e7cd Question #a42e2 Question #990a5 Mole calculation problem? (Details below) Question #233da Titration, please explain why? What does the reaction of silver nitrate and sodium chloride yield; what about barium hydroxide and sulfuric acid? How would the conductivities of the resultant solution evolve? What is the mass of silver ring? (Assume a density of 0.998 g/mL for water.) Question #2b97a What is the Absolute Zero in the following conditions? Temp Air (oC) ~ x-axis Vol Air (mL) ~y-axis 100 140 20 110 4 105 Question #24206 Question #7ca6a Question #1eaa8 Question #20de6 What is the role of EDTA and H3PO4 in the stabilization of commercialy used (3% solution) hydrogen peroxide? Question #ca83d Question #78cda Question #fb429 Question #5aa5a Question #99c7d What is the mass of octane burnt and calculating the energy released? Full Question in the description box below. Calculate for the first-excited state #psi_1(x)# of the simple harmonic oscillator the value of the Heisenberg Uncertainty relation? Question #63fbb Question #3342e Question #d7b79 Question #39b31 Question #417d7 Question #c4638 Question #33a8f How to sove this "percentage" problem? How would we know that #"Ni"("CO")_4# prefers tetrahedral over square planar? Question #f3975 Question #ff87e Question #eb2f9 Question #ac56a Question #12566 Question #6ac1a If a bottle of nail polish remover contains 176 mL of acetone, how much heat would be released by its complete combustion? The density of acetone is 0.788 g/mL. Question #a0ee5 Question #e93ed Question #d1a01 Question #7914e Question #88c44 Question #ce8be Question #09cb4 What is the mass of water vapour produced? Question #49263 How I do the THEORETICAL calculation of solubility? Question #44c0d Question #e4f9d What are the bond angles in #Si(CH_3)_4#? Question #d9144 Is there elements that cannot be combined with other elements, how to know it? Question #9dc81 Question #34a33 Question #fbb51 Question #6a599 Question #f6a45 What are standard conditions? Question #9bfb4 Question #d4f03 Question #d1e6f What is the value of the principal quantum number, n, for the hydrogen s orbital matching these curves? What is nitrogen inversion? Question #d5c4b Question #9fcd1 What is the pH of a 25 ml solution of 0.1 N HCl? Question #ca3ef Question #99793 Degree of hydrolysis of N/100 solution of KCN is ??? Question #eb4e7 Question #9ce72 What is #R# in the Ideal Gas Law? Where does the Ideal Gas Law come from? What are the units of #R#? Question #012cc How NaHSO4 is a acid salt? Na2CO3 in water is a basic. Explain the statement? The molarity of nitrous acid at which its pH becomes 2. Where Ka = 4.5 * 10 ^-4 ?? Question #27517 What is the concentration of #1*mL# of conc, #HCl# added to #199*mL# of water? Question #2b2a6 If I mix #25# #ml# of #0.1# #N# #HCl# with #1000# #mg# of #Mg(OH)_2# in #25# #ml# #H_2O#, what will the resulting pH be? Question #e2f57 Determine the molecular geometry of the following compound? SO42Question #affe9 Question #92cbb Question #0b69d Question #76aa2 Question #fbedc What is the volume of Carbon dioxide released at SLC per MJ of energy generated? How many carbon atoms are present in 3.0 mg of melatonin, if the formula for melatonin is C13H16N2O2? Question #60a11 Is #BaCO_3# thermally stable? Why or why not? Ok I know this is easy for you guys, so that's why I have them all in one spot. But that's fine if you don't know the answer for one. Thanks!?! What is the mass of #6.56xx10^26*"carbon dioxide molecules"#? How to find the amount of heart energy transferred? Question #a0d5d Question #34ce8 Question #cf007 Question #bd82f Question #9e7e2 Question #b432f Ions, periodic table questions.... Please answer if you could? Critical temperature for CO2 and CH4 are 31.1º and 81.9º C respectively. Which of these has stronger intermolecular forces and why ? Question #ba4d3 What is the mass of #3.01xx10^23# molecules of carbon dioxide, #CO_2#? Question #c16be The normal boiling point of a liquid 'A' is 350 K. #DeltaH_(vap)# at normal boiling point is #"35 kJ/mol"#. Pick out the correct statement? (Assume that #DeltaH_(vap)# to be independent of pressure) Question #3cb36 Question #f481e Question #47708 Question #ca025 200 ml of aqueous solution of HCl(pH=2) is mixed with 300 ml of an aqueous solution of NaOH(pH=12).what is the pH of the resulting solution? A gas contained inside a thick wall balloon, the pressure changes from 219 mm Hg to 215 mm Hg and the volume changes from 0.558L and the temperature changes from 115 K to 387 K, what is the new volume? Question #46e01 Question #1b9ec Why is water such a good solvent for dissolving ionic solids? Question #9d0e5 How many structural isomers does butane have? How does #NaOH# react with #CO_2#? Question #a88e4 The solubility of Pb(OH)2 in water is 6.7 *10^-6 M.What is its solubility in a buffer solution of pH=8 ? Question #0f9d7 Question #ad609 When using chlorine bleach solution for low level disinfection, how much bleach do you add to one gallon of water? To 1. 2 L of 0. 325M of HCL 3. 37L of a second HCL solution of unknown concentration is added. The resulting solution is 0 . 893M HCL. Assuming that the volume is additive, calculate the Molarity of the second HCL solution? Question #9a857 Question #1633f 10 grams of sucrose was used to prepare a 0.5 molar solution. a) Approximately how much water (in mL was added)? b) What is the molality of this solution? c) What is the mole fraction of the water in the solution? Please solve this question.answer is 4th option.3 alkene. explain pls.how this possible? Narcenine is a narcotic in opium it crystallizes from water solution as a hydrate that contain 10 . 8 massL%. if the molar mass of narceine hydrate is 499 . 52 g/mol, determine x in narceine x H2Ob? What gases are closest to being real gases? Question #8b2d0 In Victor Mayer's method 0.2g of a volatile compound on volatilisation gave 56mL of vapour at STP.It's molecular weight is? Question #9db3b What is the pH of a solution made by mixing 200 mL of 0.0657 M NaOH, 140 mL of 0.107 M HCl, and 160 mL of H2O? I know that the answer is 2.43, but could someone please explain how? Thank you so much!!!! Question #9d3ae 100 mL of a 0.1 molar solution was prepared by mixing sodium chloride and water. How many grams of NaCl was used? A solution was prepared by mixing 10 grams of glucose in enough water to make 50 mL solution. How much (in grams) of water was used? What is the mole fraction of sugar in the solution? mole fraction of water in the solution? Question #82a6b Question #1be7b Question #38351 Question #a1d34 Why is there a minus in the answer? The answer should be -102 kJ/mol, but I get 102 kJ/mol What is the mass of air in the room? (Question-image from the description box) below What is the volume of oxygen gas in the required complete combustion? Full question located as an image in the description box below. What is the volume of the oxygen gas required for this combustion reaction? (Question-image in the description box below) Question #675c6 Question #c7ef0 How many unpaired electrons are in a gaseous Co 3+ ion in its ground state? The answer is 4, but I don’t understand how. Could someone please explain? Thank you! What is the volume of 1 tons CO2 in supercritical condition? Why water can donate its one lone pair of electron as it consist 2 lone pair?? One gram of an acid #C_6H_(10)O_4#, requires 0.786g of #KOH# for complete neutralization. How many neutralizable hydrogen atoms are in this molecule? How does iron combine with oxygen gas to form rust? Question #1bdae Question #522c1 Question #4c1fb What is the pH of a solution that is 0.20 M in HF and 0.40 M in NaF? [Ka = 7.2*10^-4] I know the answer is 3.44 but could someone please explain how they got it? Thank you so much!!!! (: Question #a0ddc Question #3c66c With respect to mass, how much copper, and how sulfur are used to make #110*g# of #"copper sulfide"#? Question #6ff45 Question #5464f What weight of magnesium will dissolve in 10 cm^3 of 1 mol/dm^3 HCl and what volume of hydrogen will be produced? Thanks in advance! If N is the Avogadro's number then number of valence electrons in 4.8g of oxygen ions is? Question #b04b9 Question #417b3 Question #7670c Question #0bce5 Question #417d8 Question #400fa How many equivalents of dichromate ion are required to oxidize ONE equiv of ferrous ion to ferric ion? Which calcium compound is not appreciably more soluble in 0.1 M hydrochloric acid than it is in pure water? Question #12b49 How do you calculate the boiling point of NaCl? Question #04146 Question #4d009 Question #f8029 Question #932e3 Question #52b0c What is #"VSEPR theory?"# Question #7abd4 A #7.5*g# mass of sodium hydroxide, and a #4.0*g# mass of sulfuric acid are mixed. Which is the reagent in excess? Question #93992 How many moles of oxygen in a #24*g# mass of this gas? Question #5160c Question #6bd7b Question #ec9fb Question #4ee85 Insulin (#("C"_2"H"_10"O"_5)_n#) is dissolved in a suitable solvent at #20^@ "C"#. The slope of a plot of osmotic pressure (#Pi#) against #c# is found to be #4.65xx10^(-3)#. The molecular weight of insulin is? In galvanic cell why anode is negative and cathode is positive? Question #1de70 Question #fee98 Question #ea639 Question #dfe04 How do molecules vibrate? Question #44706 Are d electrons considered valence electrons? Question #aa7ee Question #e82ff Question #e21fc Question #1439a Question #a2ed7 Question #8914d Question #8050a Question #11aaf Question #8264d In octahedral metal complexes colors related to splitting of d orbital #t_(2g)# and #e_g# and color due to electron excited by absorption wavelength and emitted complementary color when excited electron in #e_g# back to #t_(2g)#. Where this energy go ??? How to calculate the pH of the solution if 150 mL of hydrochloric acid is consumed to complete the raction with the magnesium, with a total concentration of 0.45 #"mol / dm"^-3#? Question #18ebf How would you explain how particles move in the three states of matter.? Question #ca1d4 Question #780d6 Question #6a754 Question #332eb Question #7de33 Why is a precipitate observed when lime water is added to a solution of sodium carbonate? What are the conditions for standard enthalpy of formation? Question #c93b3 Question #e1c7e Question #0bdde Question #48bcb What is the role of NH4Cl in the precipitation of the hydroxides of group III cations? Question #df6a7 Question #6da34 Question #d3f43 Question #16a92 Question #d2dd4 Why is the hybridisation of N in borazine sp2 ? Question #689ad Can you represent the reaction of hydrogen sulfide with sulfur dioxide to give water and elemental sulfur by means of a chemical equation? What is the conjugate acid of NH4+ in the reaction NH4+ + OH- -> H2O + NH3? Question #c1727 What mass of #"aluminum sulfate"# is needed to make #0.350*L# of a #0.30*mol*L^-1# solution? Question #fdf2d Question #0c6d3 Question #5d4ac Question #c575a 0.07g of Hydride of Carbon occupies 56cm^3 at STP when vaporized and contain 14.29% by mass of hydrogen. What is the formula of the hydrocarbon? Question #b15c6 Oxidation numbers of A, B and C are +2, +5 and -2 respectively. What could be the possible formula? Question #53869 Question #66d7e Explain Gibbs Free Energy in simple language. Also, explain its application with an example? Question #b9346 Question #eb384 Question #cf9d8 Why does hydrogen bonding occur? Question #01493 What volume is occupied by a #3.0*mol# volume of gas that is heated in piston to a temperature of #323.1*K# under a pressure of #0.12*atm#? Question #b5aff If I mix 1000 mg of CaCO3 in 25 ml of water with 25 ml of 0.1 N HCl, what will the resultant pH be and how is it calculated? Question #3018f Question #f19ae Question #c5288 Question #d0f0e Question #4694a Question #c87b5 Question #4a616 Question #f01e8 Question #be2aa Question #87428 Question #30055 Question #e38cb Question #038e8 Question #9214d Question #3905a Please me explain atmospheric pressure units simple ways. ?? Thanks Question #e5cd1 What is Rf in chromatography? Question #b67ef Question #0f917 Are all combination reactions also redox reactions? Question #d4647 Calculate mass of oxalic acid (H2C2O4.2H2O) needed to prepare 250 ml ,1 M aqueous solution of oxalic acid . I got 15 g . Is my answer correct ? Question #a437d Hello, I know what amphoteric oxides are, but what factor determines whether an oxide is amphoteric? Question #8587b Question #a0976 Question #06d81 Question #fff26 To what does #Z#, #"the atomic number"#, refer: #"a. the number of electrons"#; #"b. the number of neutrons"#; #"c. the number of protons"#; #"d. none of the given options"#? What are the oxidation numbers of each element in #"oxalic acid"#, #HO(O=)C-C(=O)OH#? Question #01d24 Question #1bcc9 Question #7aeda For a first order reaction the rate constant is #1 xx 10^(-5) "s"^(-1)# having #E_a = "1800 kJ/mol"#. Then value of #ln A# at #T = "600 K"# is? Question #8fa5f Question #7905d Question #049d4 Question #b2872 Question #5544d What gas is produced when dilute HNO3 is added to silver metal? Question #a4669 What are the two most common oxidation states for antimony? Question #1fea3 Number of atoms in a nanoparticle? Question #1aa06 Question #da81e Question #1cc95 Question #9def5 Question #01b88 Question #03530 Question #856f3 Question #6f160 Question #f2663 Question #955d3 Question #3ae14 Question #5658c Question #914f7 Question #63dbe Question #7a9f4 Question #54d72 Question #940c2 Question #48398 Question #4c8e9 Ionic compounds possess a molecular structural unit and covalent compounds do not. Is this true or not true? Question #17524 Question #e7d2f Question #779fa Question #88751 Question #3dce5 The molar mass of carbon dioxide is 0.045kg/mol. Calculate the density of the gas when the temperature is 273K and the pressure is 120000Pa..? Question #510d9 How much aluminum metal is plated? Question #96589 Question #ce937 How is Z (compressibility factor) = pV/nRT derived? Question #4418f Question #e2433 Question #ddc28 How is #"TNT"# handled? Find the volume of the gas at NTP by treating 200gm of CaCO3 with excess of dil Hcl? When a solid element is reacted with chlorine, a gaseous chloride of vapor density 68.75 is formed. If this reaction is performed at constant temperature and pressure, the volume of the system reduces by #1/3#? The ratio of hydrogen and oxygen in water is 1:8. Find the ratio of number of atoms in one molecule of water?(mole concept, 9std science) Question #e467e Sodium sulphide is an ionic compound and written as by showing charges? Question #6cefe Question #ce05b In a laboratory, 23.5 g of cyclohexane is burned and 5.5 liters of carbon dioxide was obtained ? a) Balance the reaction b) Calculate the reaction yield. d(CO2)= 1.9 g/L Question #97168 Why are the bond lengths in #"CrF"_6^(4-)# not all the same? Question #cc747 Question #ae4da How can i balance lithium + Oxygen ------= lithium oxide? Question #017e9 Question #26b48 Question #73c28 Question #b58ba Is ethylene glycol molecular or ionic? Question #a9d9d Question #fefc8 Given the density of octane (C8H18) is .692 g/mL, what is the mass of oxygen required to burn 11.5 gal of octane, in the balanced equation: 2C2H18 + 25O2 -> 16CO2 + 18 H2O? Question #0d52e Question #12d84 What electrochemical reaction occurs at a copper cathode? Question #17c64 Question #b1330 Question #b9b62 Question #026cf Question #f31fc Question #292bf Why is the Lattice energy of #MgO# greater than #MgF_2# even though the size of Oxygen is greater than Fluorine? Question #377d6 How do you generalize #Delta(PV)# from #d(PV)#? Question #10017 Question #39e56 What does #sf(DeltaH)# mean when applied to a chemical reaction ? Question #feb1e Question #ecd46 Does the mass of the products always equal the mass of the reactants in a chemical reaction? What occurs when zinc metal is added to a solution of silver nitrate? Can you represent this by means of a chemical equation? Question #0d946 Question #68f03 Question #0ba2f Are aryl or phenyl same? If not , please elaborate. I have a confusion regarding the nomenclature of phenol compounds, ? Please let me explain why Resorcinol is not named as 3 - Hydroxy phenol ???? Question #bc7eb What is the difference in isbutyl and sec butyl? How , please explain. Question #eec7a Question #8ae54 Question #b5444 Question #052ac Question #40a51 Question #6f9cb Question #edba5 Question #11efb Question #c1d11 Question #8b520 Antimony is obtained by heating pulverized stibnite (Sb2S3) with scrap iron and drawing of the molten antimony from the bottom of the reaction vessel? Question #f7ab1 Question #092f3 Question #2c4df Question #7a505 What is the bond order in NO2+? Question #4d369 Question #3ec09 How do I deduce the ionic equation for the reaction between solutions of lead(ii) nitrate and sodium sulfate? please help and thanks Question #acfee Question #68e40 Question #28d83 Question #7ec93 Question #87d1d Question #65977 Question #6829e Question #fc782 Question #03ab8 If [OH-] = 5 * 10^-5 M then the pH will be..??? Consider the titration of 50 ml of 0.1 M NaOH with 0,10, 25 and 30 ml of 0.2M HCl ? What happens to structures made from steel? Question #9cce2 Question #3933a How many calories are required to raise the temperature of a 11.6 g sample of iron from 22.2°C to 41.6°C? Question #95fb4 How many neutrons in 49Fe? Diamonds have a density of 3.52 g/mL. What is the volume (in units of cm3) of a diamond with a mass of 21 g? You have a bowl of Campbell's Chunky Soup. It has a volume of 143 mL and a mass of 320 g. What is the density of the soup? Please let me elaborate about Is, neo in organic compounds ? Thank you. What is the circle on top of variables in chem? Question #d420a Question #e780e What do effervescent tablets contain , that make them release CO2 on contact with water? Question #51b5c Question #c6b0a Question #9f9f9 #sp^3# hybridization - can somebody explain what my book is trying to say? When a molecule has an #sp^3d# hybridization with 2 lone pairs, the molecular geometry is T-shaped. Why is the T-shape preferable over a trigonal planar shape? (ie, why are the lone pairs positioned that way?) Can the nitrate ion oxidize iodide ion in neutral solution? If so, what is the balanced equation for the reaction? Question #20b55 Question #72e2c What is #"concentration?"# Question #75501 Question #90302 Question #40c64 Consider the following equilibrium. 2SO2(g) + O2(g) 2SO3(g) The equilibrium cannot be established when ________ is/are placed in a 1.0-L container? Question #f6e36 Question #8c4a1 Question #1180e Question #3f0ca Question #7d6f1 Question #a89ba Question #6c898 Question #848b4 Question #9d8e6 How come ionic bonds do not conduct electricity and metallic bonds do? Question #a1c07 #"5 g"# of copper was heated from #20^@"C"# to #80^@"C"#. How much energy was used to heat the Cu? (specific heat for copper = #("0.38 J")/("g"*""^@"C")#. Question #f8fb4 Question #84590 Question #dd295 Question #8c1f9 Question #e3d2a Question #83986 Question #1f19b Question #47093 Question #3b8ef Is the solubility of a substance an important physical property? Why HCOOH is comparatively more acidic than CH3COOH..??? What to put on my Chemistry Final Notecard? What is the most significant greenhouse gas? Are all hydroxides (metallic and non-metallic) bases? or is it only metallic hydroxides that are basic? Question #fbd14 Question #708bc Question #14ac0 Question #db923 Question #bd6dc The half-life of 32P is 14 days. You start with 10 picograms of 32P. How much is left after 28 days? Question #21099 Question #091c9 Question #93ecc Question #3a315 Question #a3dc5 Question #2a169 What does a catalyst do? Question #4658d Question #b680e How many gaseous particles in a #11.2*dm^3# volume of gas? How does the loss or gain of an electron affect the atomic radius? How is #"calcium sulfite"# prepared? Question #89b52 Question #f2be8 Question #8a4ea Question #7a42b Question #8cdbe As you go down a column on the periodic table does the reactivity of metals increase or decrease? Question #8ea16 Question #03cf5 At what temperature are the values for viscosity for different compounds on the USA EPA Chemistry Dashboard based of? What is the charge of a cation? How do cations form? Question: Solve: 3.12g + 0.8g + 1.033g (with significant figures) Answer: 5.0 (Look at the image below: Why is C Correct?) WHY IS THIS RIGHT? i thought it was A? What reagent could NOT be used to separate #OH^-# from #Cl^-# when added to an aqueous solution containing both? Question #498ca How many moles of hydrogen are there in #25.3# #g# of methane, #CH_4#? Question #92682 What is the maximum number of electrons in an atom that can have the following set of quantum numbers? n = 3, ml = 2, ms = +1/2 Which of the following gases has the highest average speed at 400K? Question #412f2 Why silver nitrate is called lunar caustic? Precisely please. Question #c0e92 Question #88d9a Question #68438 Question #74688 Question #0bc28 Question #63bc0 How to determine Total Anhydrous Soap in Hand Liquid soap? Question #f0475 Question #b3c94 What do the charges on the atoms on each side (right and left sides) of the chemical equation indicate? Which of the following are amphoteric oxides? Answer this question with sig figs: 100 + 10.1 + 0.01=? How many moles of O2 are in 1000 cubic millimeters? Anybody can help? Question #8b48c Question #d6b8c Question #4b6f5 Question #e92d0 Question #d54dc What is octane number? Please elaborate. Thanks! Question #7f077 What is the equivalent weight of the reactants in the following reactions? Question #9f6fa Question #7a3d1 Question #856d6 Question #cb4ce Question #813f5 Question #a0bf7 Question #614fe Question #3c3a6 Question #c849f Which of these statements is correct? Question #e92de Identify the compounds in this MCQ.? Question #4d767 Question #2e8a6 Question #34103 Please help with this MCQ? Question #7cfbb Question #73dee Why does aluminum powder react more quickly with oxygen gas as compared to a block of aluminum? Question #6c475 Question #2065a Question #7790a What mass of #"sodium azide"#, #Na^(+)N_3^(-)#, is required to evolve #11.3*L# of dinitrogen gas at #10^5*Pa# pressure, and #0# #""^@C#? Question #c34b2 Question #60956 Question #b131f A #0.2400*g# mass of #Na_2CO_3# were neutralized by a #23.04*mL# volume of #HCl(aq)#. What was #[HCl(aq)]#? How many molecules of N2 are needed to produce 2.85 g of NF3? The density of a 20% by mass solution of sulphuric acid is 1.14g/ml. Calculate the mass of hydrogen sulphate in one litre of the solution. ? Question #9cd85 What intermolecular forces are present between ethanol and methanol? Question #c5221 Could someone help me what the relationship between these two compounds are? Please explain! I know enantiomers are non superimposable mirror images but how does that help? Question #73af7 Question #ee092 Question #25ac5 Question #0b96e Question #f3576 Question #097ea How many grams of glucose (C6H12O6) would need to prepare 250g of 5% mass solution of glucose? Diamond structure: Each carbon atom is tetrahedral surrounded with 4 carbon atoms. How do I get to the number of carbon atoms in the elemental steel? Question #a127f Question #dc1a5 Which of the following least resembles an ideal gas? Question #6c11e Question #ab80d Question #06076 Question #9ed94 How do you know if a compound is soluble in a particular solvent? Question #6efd1 Question #1c109 Question #a1d40 Question #f4bb5 Question #451ae What is the new volume when #1.5*L# volume of gas at #775*mm*Hg# pressure is put under a #675*mm*Hg# pressure? Question #0dad3 Question #0efc3 Question #9c99a Question #87232 How does the electronic of calcium metal compare with #Ca^(2+)# ion..? Question #6b51b Question #b6bbf Question #972ef Question #7129a Question #0d718 A patient ingested barium−131. How much time will elapse until only 1/32 of the barium−131 remains, assuming that none of the isotope is eliminated from the body through normal processes? Answer in minutes Question #be4dc For the reaction 2C2H6 + 7O2Õ 4CO2 + 6H2O How many grams of water are produced when 0.25 moles of CO2 forms? Question #ec9ab Question #410c8 #"pH"# of #"HF"# given #["HF"] = "0.25 mol/L"#... Can I assume #["HF"] = ["H"_3"O"^(+)]# and calculate it even if it's a weak acid? Question #8b8fb Question #76b84 In transition elements , how does d orbital split into two different energy states ? Question #8ec28 Question #67ffa What is the density of a proton, i.e. #""^1H^+#? Question #7d389 Predict the product in the combination reaction below. Al (s) + N2 (g) Õ ________? For the reaction N2(g)+3H2(g)--> 2NH3(g). How many moles of N2 will be need to react with exactly 1.00mol if H2? Question #8e0ca Question #34055 Question #13e3f Question #061b5 Question #8198e Question #1152d Question #d149c Question #9a627 What is meant by #"parts per million"#? Question #6c4c4 Question #65ca5 Question #e7ab0 Question #1013d Question #33014 Question #85204 Question #ce6a5 Is this a redox reaction? Use oxidation numbers to determine whether or not this is a redox reaction. CH4(g) + 2O2(g) = CO2(g) + 2H2O(g) Question #a4c27 Question #390a5 Question #14462 Question #4db2c Which element in period 3 exerts the greatest pull from its nucleus on its valence electrons? Question #e5e21 What is the value of each of the four quantum numbers for an electron in a #2p# subshelll? Question #b18b6 For the reaction, #["Ag(CN)"_2]^(-)-> "Ag"^+ + "2CN"^-# the equilibrium constant at 298 K is #4.0 × 10^-10#. The silver ion concentration in a solution which was originally 0.12 M in KCN and 0.04 M in #"AgNO"_3# is? Question #c1dd3 Question #60219 What is crystal field theory? Question #28d46 Question #8923a Calculate the density of gold if the mass of a 8.1cm x 4.3 cm x 1.8 cm gold bar is 1.211 kg? answer in units of g/ml How is boiling point defined? And how does boiling point vary, when ambient pressure is reduced? How do you write formulas and names for the following elements? Question #a5bde Which molecule has hydrogen atoms with largest partial positive? Question #239db Question #001ce Question #795c5 How to find the empirical formula for C5H10O5? Question #72efb Question #876b9 What intermolecular forces operate in #PCl_3#? Question #741c7 Question #edcaa Question #b688f Question #a0a3f Question #cf428 Question #19820 Question #4a7aa Question #cf54f Question #15936 Question #53432 Question #2465d Question #50761 Question #703cc Question #fc002 How many moles of silicon are in 1.67x10(24) Si atoms? Question #ebedd Question #09c60 Question #7400c Question #b3500 Question #507f4 Question #9ae33 Question #28b04 Why is galvanizing more effective form of rust protection than painting or oiling? What is the anode and cathode half-reactions of rusting of iron? Question #f19eb Question #15795 Question #e456b Draw a Jablonski diagram for formaldehyde? Label all the radiative and radiationless processes. Assume the extinction coefficients and quantum yields for all the absorptions and emissions (respectively) are equal. Sketch the UV-Vis spectrum. Calculate RMS speed of hydrogen molecules in a sample of hydrogen gas at 300 K? What is the mass of 3.00 moles of Nitrogen gas (N2)? Question #88e62 How many atoms are in a sample of 7.50 g of Potassium (K)? Question #45731 Question #e76d6 Question #af0a5 Question #2c594 Is it possible for oxidation to occur without reduction? Justify your answer. Question #3ce85 Question #4a7f7 Question #55913 Question #f5f37 Question #d860c Question #d2d61 An element has 18 protons and 20 neutrons. What is it's symbol, including the mass number? Are the two gases he made the same? In an experiment a student burns 27.6 kg of wood. He collects all the products, finding that it produced 1.3 kg of ash, 45.4 kg of carbon dioxide, and 24.3 kg of water. How many kilograms of oxygen were consumed in the burning process? Question #5b025 What is the oxidation number of oxygen in CH3COOH ? Question #e2639 If a volume of mixture of CO2 and CO increases by 20% on passing over hot cake, then what is the percentage of CO2 in the original mixture? Determine the limiting reactant of the unbalanced chemical reaction if 2.00 mole of ethane is reacted with unlimited oxygen? #C^2H^6(g)+ O^2(g) --> CO^2(g) + H^2O(l)# What would be the correct formula of the resulting compound if calcium chemically combined with oxygen to form an electrically neutral compound? To react with barium hydroxide, how many equivalents of sulfuric acid are necessary? Question #12d3c Can someone explain to me what the hybridization and molecular geometry for p2O7-4 would be considered? Question #5392e Write iupac name for following compound: C3H8,C3H6,C3H4. ? Question #0da60 Question #095fb Question #a97ae What mass of product results from complete combustion of a #50*g# mass of methane? Question #a35c2 If element X has an atomic radius larger than Ga, an electron affinity lower than Na, and an ionization energy higher than Cs, give one possible identity of element X? #13.2*g# of mercury metal, and #1.0*g# oxygen combine to form mercuric oxide. What is the empirical formula? Question #f9c78 Question #a0453 Question #dcfa9 Of #NaCl#, #Li_2SO_4#, #LiCl#, #Li_3PO_4#, which salt would have the greatest lattice enthalpy? Question #c380a Question #f0363 Question #82ef4 Question #8244d Question #8fb2b How do I write the reaction between permanganate, and sulfite ions? Question #d4a17 Question #e4ea1 What are the reactants and products in 2NaN3(s)-->3N2(g)+2Na(s)? How many moles of MgSiO3 are in 209g of the compound? Question #c3123 Question #86e9b How many electrons in 3 moles of ozone gas? What is the mole fraction of each component gas in a mixture composed of #66.8*g# #"dioxygen"#, #44.1*g# #"dinitrogen"#, and #21.5# #"dihydrogen"#? For the reaction: #CH_3OH(l) rarr CO(g) + 2H_2(g)# #;DeltaH^@=+128.1*kJ*mol^-1.# If a #15.5*g# mass of methanol is reacted completely, what will be the associated enthalpy change? Thermochemistry help: What is the difference between.... ? Please clarify and explain. Question #81a4b Question #8d86c Question #dc974 Question #65f69 Question #60420 Question #d7851 Question #2e60e VBT theory predict Hybridization OR derive Hybridization from VSEPR theory VBT explains bonding with respect to VSEPR - it didn't expect Hybridization H2O SP3 due to vespr not vbt expect second why there is no Hybridization in HF for VBT explaination ? O2 molecules there are 1 sigma bond and 1 pi bond and 2 lone pair of electron for each oxygen ( non bonding electrons ) ?? so how MOT diagram shows 1 sigma and 2 pi bond and there is no non bonding electrons as all orbital combine together ? How would you use the steady state approximation to find the rate law for this reaction? For the equilibrium, CO_(s)+CO2_(g)--->2CO_(g), Kp=63atm at 1000K.If at equilibrium Pco=10Pco2 then total pressure at equilibrium is? Question #26248 Question #812bd Question #54b11 Question #506b9 Question #8b77a Consider the reaction: 2A + B Õ C, and a kinetics study on this reaction yielded...? Question #56f9d Is it true that aqueous solutions of sodium chloride, have a higher boiling point, and a lower melting point, than those of pure water? Question #ef4a2 How do we make a #15%# solution of ethanol? A #10*g# mass of argon, and a #20*g# mass of neon, are confined in a #1200*mL# container, what are the partial pressures of each component gas, and the total pressure? Question #e5a4c Question #4e83a How many molecules of Sulfur Trioxide are there in 0.0353 moles of sulfur trioxide? Question #ca4ea Question #83f60 Question #4877a Chemistry question relating to quantum numbers? Can you calculate the amount of heat absorbed when carbon monoxide does 339J of work while expanding? The change in internal energy is -0.074KJ. Question #b985a How to know what the equation of #AgC_2H_3O_2# salt will dissolve to +states? Question #8965b Question #0ece0 A solution contains 0.025 M Ca2+ and 0.015 M Ag+. Determine whether it is possible to precipitate 99% of Ca2+ by sulphate without precipitating Ag+? Question #3ec9c Question #95a37 Why does PCl5 in the solid state exist as cation and anion, i.e. in the form of PCl4^+ and PCl6^-? Question #a6bde Question #9bf88 Question #9d35e Question #0c7d2 Question #831cb Question #60992 Question #f1dd2 A mixture of 1.000mol of CO and 1.000mol of H2O is put in a 10.00L container at 800K, at equilibrium, 0.665mol of CO2, and 0.665mol of H2 are present. The equation: CO+H2O<->CO2+H2. What are the equilibrium concentrations of all 4 gases? Question #6a49b Question #36398 Question #5d4ec Question #ec696 Question #961d3 Question #f8124 2AgNO3+NaCrO4 -->Ag2CrO4+2NaNO3 How many grams of silver chromate, AgCrO4, are produced from 66.1g of silver nitrate, AgNO3? What will be the equilibrium constant at #127^circC#, if #K# at #27^circC# is #4# for reaction #N_2+3H_2->2NH_3#; #DeltaH=-46.06kJcolor(white)(l)mol^(-1)#? Question #3bad9 Question #95897 Question #466d3 Question #faba1 Question #53fc4 Question #e73c1 Question #638cc Question #8aaf2 Question #fbe94 Question #6a148 How do I represent the combustion of propane, and hexane? How would you prepare lead(II) sulfate from lead(II) carbonate ? At 500K, NOCl is 90% decomposed for the reaction 2NOCl<->2NO+Cl2. If we assume that 1.00mol of NOCl in 1.00L before dissociation, what is the value of Kc for equilibrium at 500K? How many moles of Fluorine(F2) would contain 2.57 x 10(23) molecules of fluorine? Question #a7766 Question #ec390 Question #50fb8 Question #8784a Question #32fe8 The equilibrium constant for the reaction 2IBr<->I2+Br2 is 8.5×10^-3 at 150°C. If 0.0300 mol of IBr is introduced to a 1L container, what is the concentration of the substance after equilibrium is established? Question #4b9fd How to draw a BN molecular orbital diagram? Question #11695 Question #d5175 Calcium chloride is used to melt ice and snow on roads and sidewalks and to remove water from organic liquids. What is the molarity of a solution prepared by diluting 165 mL of 0.688 M calcium chloride to 925 mL? Question #0875f Question #6b4cb Question #8b8a0 What is the #pH# of a saturated solution of calcium hydroxide, given that #K_"sp"(Ca(OH)_2)-=1.30xx10^-6#? What is the molar concentration of Na+ cations in a 0.250 M Na2SO4 solution? Question #230ee Acid and base; solving for pH of a solution? Question #821ef Question #47186 Question #50027 How many atoms of iron are there in 3.77 moles of Iron? How would much water in grams be required to completely dissolve 75 grams of KNO3 at 60 degrees celsius? Question #b1c6a Question #82d3c Give the number of core electrons for F-? Question #f9da2 The equilibrium constant for the reaction H2+I2<->2HI is 54.8 at 425°. What are the concentrations for all gases present if there is 1.000mol of each gas in a one litre container? Question #16993 Question #73368 Question #3066e Question #3828a Question #b413f Question #e98e1 Question #84452 Question #5733c Question #8e5a9 Question #9adea Question #08fa6 What is oxidation number? Write its uses. Question #b8ae0 Use the following information to predict ΔH for the reaction: HClO4(aq) + NaOH(aq) Õ NaClO4(aq) + H2O(l) Solution Mass (g) Volume (ml) Molarity (mol/L) Initial Temperature (°C) HClO4(aq) 51.99 51.98 0.500 25.42 NaOH(aq 51.49 51.48 0.500 25.42? Question #9e4c2 Question #929cd Question #41144 Explain the difference between polarity and electronegativity? Question #e54c6 Question #89586 Question #1e1da Question #931cf Question #b549f Question #f5f77 Question #f9f58 Question #f4b15 Question #41324 Question #f27fc Question #0e67b Question #9f36f Question #12ada Question #6ed25 What intermolecular forces exist for urea? What are the carbon hybridizations observed in the allene derivative, #C_4H_6#? Question #22ea6 Why is it said that a #sp^2# hybridized carbon more electronegative than a #sp^3# hybridized carbon? Question #9f79f Question #53580 Question #54a4f Question #2d856 Which of the following mixtures will result in the formation of a precipitate of #Ag_2SO_4#? Question #9115e Question #e0291 What is the pH of a 0.10M solution of HC2H3)2 that dissociates 5.8%? (ans: 2.24) Question #e167f Question #75f6d How to solve limiting reagent problem set? How to solve limiting reagent problem set? Question #a407a Question #db948 Which of the following is an oxidation-reduction reaction? Question #5355c How do we calculate the total number of atoms on the reactant and product side of a chemical reaction? What is the molar concentration of 254.2 x 10^-3 L of an H2CrO4 (chromic acid) solution that required 975.9 mL of a 0.1430 M standard solution of LiOH for complete neutralization? Question #fe09a Question #119d9 Question #d51cc Why is the #O^(2-) (g)# ion unstable? Doesn't its electron configuration match that of Neon? What is the reducing agent in the reaction #2HCl(aq)+H_2O_2(aq)->Cl_2(g)+2H_2O(l)?# A 1.30g sample of Lead(II) Hydroxide was reacted with 50 mL of 0.250 mol/L Hydrochloric Acid to form a solid precipitate. How much solid precipitate should be formed? (Ans: 1.50g) Question #8ce69 Question #7202a Question #35eac Question #81f00 Question #f4a59 What is the pH of the solution in the cathode compartment of the following cell if the measured cell potential at 25 C is 0.52 V ? Question #8cf1f Derive formula for #2n^2#? Finding #DeltaH# given heat released and mass in bomb calorimetry? Calculating the molecular formula of caffeine? Caffeine, contains 49.48% Carbon, 5.15% Hydrogen, 28.87% nitrogen, 16.49% oxygen. It has a molar mass of 194.2 gmol -1. Question #7b6fb Given the following heat of formation values, calculate the heat of reaction for:? Question #300e6 Question #b48dc Question #d100d Question #33be4 Question #1a4c0 Question #c7d06 Unit Conversion Help? Question #23721 Question #80fd6 Question #a2ae2 Question #e7dd8 Question #96538 Question #36757 Question #f8294 How do you determine the number of moles of carbon dioxide that result from combustion of a particular fuel? Question #64395 Question #621e1 Question #6e87c How do we calculate ionic strength on the molal scale? Question #f7b05 Calculate #DeltaG_f^°# of #CH_4# from the tabulated values? Question #40387 Question #807c9 Question #a165f Question #96e76 What is the order of DECREASING ACIDITY for #"water, sodium acetate,"# #"hydrogen chloride,"# and #"ammonium chloride"#? Question #3718c Question #06555 Question #d6832 Question #97603 Question #f3a0c Question #8a725 What are the concentrations of #H_2CO_3# and its conjugate bases in a raindrop with #pH = 5.90#? Question #c8e58 Question #8a6d1 Question #6f0c4 Why might organizing elements based on their atomic masses and their properties not be the best way to organize in a periodic table? A solution of a mixture of formic acid and formate ion is analyzed and found to contain 0.669 mM formic acid and 0.444 mM formate ion. What is the pH of this solution (the Ka of formic acid is 1.78×10^-4? Question #4d93a Consider the following reduction potential information for the remaining questions regarding placing Mg(s) in acid? Question #13277 Question #ff261 How many calories (with a little c) are required to raise the temperature of 28.6 g of water by 66.3°C? A person takes a single dose of 500 mg of aspiring. The half life of aspirin in the body is 3 hours. At what point will 97% of the aspirin have left the person’s body? Question #44221 What are #"density"#, and #"relative density"#? Question #d914c Question #ea8f3 Question #f24da Question #ef38d Question #d1c95 Question #ce205 What is [H3O+] for a buffer solution that is 0.200 M in acid and 0.500 M in the corresponding salt, if the weak acid's Ka = 5.50 × 10−7? What is the atomicity of sodium nitrate? Question #e90af Question #04c20 Question #a7298 Question #344cb How do you convert #"0.000 000 000 6979 s"# to scientific notation using two significant figures? Question #f031e Which one of the following reaction equations is the net ionic equation for the reaction of hydrochloric acid with lithium hydroxide? All species are in aqueous solution. Calculate the standard cell potential (E) for the reaction? X(s)+Y+(aq) ÕX+(aq)+Y(s) if K = 5.14×10−3. Question #e67e9 Question #8ee6c Which Chloride should have the greatest covalent character? Question #2fc0d Determine the volume (in #"mL"#) of #"3.81 M"# sodium hydroxide that must be added to #"67.2 mL"# of #"0.655 M"# sodium hydrogen sulfite to yield a #"pH"# of #6.83#? Assume the #5%# approximation is valid and report your answer to 3 significant figures. 1. Is chemical reaction and chemical change same? 2. Is physical reaction and physical change same? What new element results from the fusion of #""^209Bi# and #""^58Fe# with the expulsion of neutron? Question #bfbad How does potassium oxide react with water? Question #0d829 Question #c852e Question #0f0f9 What is the #K_(eq)# at this temperature? Question #c5a85 Question #dd8a8 How many liters of 44.70 M nitric acid contain 46.36g HNO3 (63.01 g/mol)? Is HCOOH the conjugate acid of the basic formate ion (CHOO^-)? Does voltage/current affect the temperature of the solution in electrolysis? Question #dca56 Question #79649 Question #52344 Which one of the following reaction equations is the molecular equation for the reaction of hydrochloric acid with sodium hydroxide? All species are in aqueous solution. Question #cb9c2 Question #03e8d How does ionization energy of an atom change down a Group of the Periodic Table? Question #77668 Question #23b7c Question #84127 Calculate the amount of energy released when 3.60 kg of butane (C4H10) is burnt in an unlimited supply of oxygen.? Which pair of reactants will produce a precipitate? Question #6a42d Can someone explain please? #0.98 g# of the metal sulfate was dissolved in water and excess of barium chloride was chloride was added. The precipitate barium sulfate weighed #0.95 g#. Calculate the equivalent weight of metal? Can Someone Explain Hess's Law? Question #dc298 Question #1f211 Question #7e6ce Which of the following is an oxidation-reduction reaction? Question #84ea9 #25.32*mL# of #KOH# titrant whose concentration was #0.2683*mol*L^-1# was used to reach equivalence with a #97.4*mL# volume of acetic acid. What is the concentration of acetic acid? What do you predict you would observe if you put a piece of Ba metal in water, with a phenolphthalein indicator? Would it heat up? Would gas form? Would the solution change color? Would the appearance of metal change? Question #dacf9 When you see a hydrocarbon with the generic formula of CnH2n, what compound is it? When decane is burned in air, how many moles of water are expected to be formed for 1 mole of decane? Question #92f86 Question #83ae4 Question #138b0 Question #44926 Question #ed6f3 Question #c13a6 Question #e8342 Question #74f06 Question #8721d How is potassium permanganate deployed quantitatively as an oxidant? Question #31fdd What is the charge on the iron(III) complex ion in [Fe(OH)2(H2O)4]Br? Question #57579 Question #a92de Question #f0dd4 Consider a buffer solution where [weak acid] > [conjugate base]. How is the pH of the solution related to the pKa value of the weak acid? If [conjugate base] > [weak acid], how is pH related to pKa? Question #62f84 How do I find the pH of a diprotic acid? Question #1275d Question #70abe Question #23fd6 Question #12fa6 How do we represent conservation of mass and charge in a chemical reaction? What is the mass of #5*mol# quantity of ice? Question #09d20 Question #10f2a Question #36991 Question #99bda If 1.50 L of a gas is at standard temperature and pressure is compressed to 556 mL, what is the new pressure of the gas in atm? Could someone help me to solve the mentioned problem? Question #8cb7f Question #8dca7 Consider the titration of 50 ml of 0.1 M NH3 with 0, 10, 25, 45, 50, 60, 80 and 100 ml of 0.1 M HCl? Question #e7848 Question #15a17 Question #4f0b8 Question #318e9 Question #fe347 Question #4126f Question #2e025 Question #f6086 What is the rate law for this reaction? Question #26eca Question #d4706 What is the conjugate acid of HS-1? pH of a solution in which #["H"^(+)] = 1.25 xx 10^(-12) "M"#? Question #f7e41 Question #95c54 If the pH of a solution is 3.44, the pOH of the solution is? Question #4440c Question #0624a Question #4f5b1 Question #bee0c An iron piston in a compressor has a mass of 3.62 kg. If the specific heat of iron is 0.449 J/g°C, how much heat is required to raise the temperature of the piston from 12.0°C to 111.0°C? Question #2f9e0 Question #2fd18 Question #1d85e Question #0952a What occurs when equimolar quantities of sulfuric acid and barium nitrate are mixed? What is the concentration of #BaSO_4(aq)# is #K_"sp" (BaSO_4)=1.10xx10^-10#? Question #36746 Question #e3cde Question #e2311 Question #3d50a Question #1aba7 Question #faf3f Question #08c41 Question #d5d68 How do I find ΔHrxn for this reaction? Question #41629 Question #28faf Hydrosulfuric acid, H2S, has two acid ionization constants. What is the equation that corresponds to the Ka value of Ka = 8.9 × 10^−8? and include states of matter in the answer Question #04560 Question #a1674 How do you find the equilibrium constant for the chemical equation? Question #291bf For Enthalpy? the formula and what answer you all got? The sum(product)-The sum(reactant) I am having trouble with these! if 75ml of 0.211M NaOH is diluated in a final volume of 125m, what is the concentrration of the new solution? Question #f4fbd Question #64344 If the H3O+ of a solution is 5.62x10-12M, what is the OH of the same solution? Assuming 25 degrees celcuis? A Chemist has 100g of 25% acid solution. How much of these solution he needs to drain and replace with 70% acid solution to obtain 100g of 60% acid solution? Question #16a7e Question #06f38 What is the density in g/cm^3 of an iron ball that has a radius of 45.0 mm, and a mass of 300 g? Question #88a2e Question #ef6c2 Burning a 0.204 g sample of the unknown compound in an excess of oxygen produces 0.2990 g of CO2 (carbon dioxide). The carbon initially in the unknown compound is completely converted to carbon in the CO2. How many moles of CO2 does this mass of CO2equal? Given that #[Au(SO_3F)_4]# ion always has #(-1)# charge. The equivalent weight of #Br_2# in #[Br_3][Au(SO_3F)_4] + Br_2 -> [Br_5] [Au(SO_3F)_4]# is? How do graph temperature versus time for a pure substance? Question #4750a Question #0504b How do you get #12*mol# of ammonia from #6*mol# dinitrogen, and #12*mol# dihydrogen? Why is one a buffer solution and not the other? Question #4c075 How does a match ignite: #"A. by magic; B. by kinetic energy;"# #"C. by chemical energy; D. by an explosion"#? Question #fd2bf #50g# of pure #CaCO_3# is heated, liberated #CO_2# reacted 0.4 mol of moist ammonia to yield only #(NH_4_2CO_3#. Find the volume of 3 #CO_2# left after the reaction at STP? Question #74b19 Question #5239f What is the bond order of HCO3- ? Thank you How to solve this? Question #c9f41 Question #fde10 Question #5a0c2 Question #b96c7 The number of moles of electrons taken up when 1 mole of #NO_3^-# ions is reduced to 1 mole of #NH_2OH# is? #HNO_3# oxidizes #NH_4^+# ions to nitrogen and itself gets reduced to #NO_2#. The moles of #HNO_3# required by 1 mole of # (NH_4)_2SO_4 is? Question #28471 Question #e5863 Question #4a561 Question #4ad3f What mass of hydrogen is produced? Question #3654e Question #5f2d6 Question #bc168 Calculate the standard enthalpy change for a reaction? : Fe2O3(s) + 2Al(s) = Al2O3(s) + 2Fe(s). Question #3d2c7 Question #e6475 Question #cb53c Question #1691f Question #706c0 Question #20b05 Question #d31a7 How to arrange the following atoms and ions in order of increasing atomic size?: #"Rb", "Ag", "O"^(-2), "Al", "O", "Cs", "Al"^(+3), "Si"# What is the molarity of an HCl solution if 25.0 mL of a 0.13 M NaOH solution are needed to neutralize 30.0 mL of the sample? Question #a0a3b Question #daeef How to calculate amount of substance in phycocyanin tablet? please help Question #a3e6c Question #a80fe Determine the percent yield for this reaction.? Question #4e31f Question #02ca3 Sorry.my another question is wrong.here is my question? What is the Lewis Dot Structure of (CH3)2SeCl2? Question #3a3a1 Question #13a37 Question #34363 A #0.600*mol# quantity of magnesium acetate is dissolved in #135*mL# of water, what are the concentrations with respect to magnesium and acetate ions? Question #8680a Name a cation or a radical with valency '2'? Question #dea0b How do I work out the required energy to 150 litre's of water from 10oC to 50oC? Question #0e06d Question #7fdb7 Question #2b33e Question #0e84f Question #6ab6e Question #3d35b Question #da59c Is there any sort of resonance in this ion? In a #75*g# mass of calcium carbonate, how many moles of each constituent element? Question #dcc47 Question #ef37f How does phosphide anion form a salt with #Cu^+#? Question #fd0fe Question #7fad9 Question #564d6 Question #ddc63 Question #2758c Question #cbe61 Question #ce273 Question #ba23d Question #8633d Question #d9e98 6.90 g of Sr(NO3)2 is dissolved in water to form 0.530 dm3 of solution. A 0.200 dm3 sample is withdrawn and titrated with a 0.0260 M solution of Na2CrO4. What volume of Na2CrO4 solution is needed to precipitate all the Sr2+(aq) as SrCrO4? Question #0f32b Latin name of lead ? Question #3b030 Which material should exert the most vapour pressure under standard conditions: #"ethanol"#; #"butane"#; #"methanol"#; #"pentane"#; #"hexane"#? Question #f1aef Student will react 50mL pipetted samples of 0.2M potassium phosphate solution with an excess of 0.12M lead II nitrate solution.? Question #805cf Question #4f29e Question #18906 Question #66e0e Write balanced net ionic equations for the following reactions in basic solution? I'm having trouble with these basic solution half reaction problems, any help would be great. Question #db973 Question #4f67b Question #0884c Question #de84b Question #43981 Is 0.10 M of NH4OH more acidic than 0.10 M of NaOH? If so/if not, how do you go about understanding what molecule is more acidic? Is there a quick and simple trick? What could the #""^(n)"Pr"# mean in #""^(n)"PrNH"_2#? What is one way to increase the rate of dissolving salute in to________ A. Decrease the temperature of the solution B. Let the solute settle to the bottom of the solution C. Stir the solution D. Use a salute with a larger particle size What is the answer? Question #d71c5 Question #6a37c Question #12d20 Question #f9d4f Does hydrogen bonding always occur when hydrogen is bound to an electronegative element? Question #3b307 Question #fcbc7 A 0. 4960g sample of a CaCO3 dissolved in an acidic solution. The calcium is precipitated as CaC2O4. H2O and dry precipitate is found to weigh 0. 6186g. What is the percentage of CaO in the sample? Question #4ca48 Question #eedcc Question #81c13 What is the mass of an oxygen atom? What do we mean by #"ionization energy?"# Question #1eb84 What is the first ionization energy of an element? Question #e9d68 Question #9154e Question #e1ce4 Question #894ed Question #aac3c Question #f4252 Molarity question? Question #b942e Question #6007d Question #b560e Question #2ccd5 Question #7ca9c Question #dcc5b Question #edde8 Question #66ae2 Question #2fd19 Solubility Equilibria Regarding #AgCl(s)# and Complex-Ion Formation #Ag(NH_3)_2^+# Question? Question #823ab Question #89c74 Question #72ef9 Question #56be6 Question #04f75 Question #116f9 Question #d8225 Question #d0ba0 Question #138bc Question #5adf2 Question #e9939 How to balance the chemical reaction #FeCr_2O_4 + KClO_3 + K_2CO_3 -> Fe_2O_3 + K_2CrO_4 + KCl + CO_2# using Oxidation number method? A mercury electrode is used to measure the #["Hg"^(2+)]# in a test solution. The electrode is measured to have a potential of #"0.793 V"#. Calculate the concentration of #["Hg"^(2+)]#? Question #877f4 Question #23d6b Question #361f5 Question #f201c Question #f9f15 In which hydride is the H-X-H bond angle the smallest? Question #2032d Question #02876 Question #2208d Question #f1a87 Question #2d340 Question #c1328 Question #09547 I'm confused with this chemistry problem? Question #47910 Question #7b14c Rate of consumption of dinitrogenpentoxide is 0.5mol per litre per sec rate of formation of NO2 is ?? Which of the following is a characteristic of a reversible reaction? (1) No. of moles of reactants and products are equal (2) It can never proceed to completion (3) It can be influenced by a catalyst (4) All of these Question #46aeb Question #cade0 Question #2f32f Question #e6d55 Question #3da81 Question #47bc8 Question #d6b41 Question #96715 How many metal atoms are present in 3.00 kg of Iron (III) oxide, with explanation? What is the volume of a sample of NaOH solution that contains 154 grams of NaOH and has a concentration of 0.55 M? Question #5ac6b Toluene and benzene have vapour pressures at 20 °C of approximately 22 mmHg and 75 mmHg, respectively. Calculate the total pressure of an ideal solution made up of 0.828 mol toluene and 0.172 mol benzene at this temperature? Question #52e85 Does beta decay create ions? Question #9c14b Question #3254c Why are 2-amino acids soluble in water and have high melting points? Question #9bce7 In the electrolysis of water, how long will it take to produce 250.0 L of H2 at 1.0 atm and 273 K using an electrolytic cell through which the current is 235.0 mA? Question #c564a Question #77e1a What is the new volume of a gas at #655*mm*Hg# pressure AND volume of #955*L# that is compressed to #1.34*atm#? Question #942a2 Question #98fcb Question #53695 What is percent yield of this reaction? Question #3b666 For the reaction Cl2(g) + KBr(s) to KCl(s) + Br2(g),how many grams of potassium chloride can be produced from 300 grams of potassium bromide? a.98.7g b.111g c.188g d.451g Question #a9dd1 Question #768e5 Question #a28f9 Question #460d5 Question #8695d Question #c3d9b Question #ce2b8 Question #c3e3c Which ΔS do you use to decide spontaneity? Question #07d5a A molecule contains 0.765 g of Barium and 0.890 g of Bromine. What is the empirical formula? Question #8dfc7 Question #ed7a4 Question #1b99b Question #2fb01 Question #05533 Question #80ccd Question #1c1a3 Question #28959 Which of the following transitions would result in the absorption of a photon with the longest wavelength? Question #b6567 Solubility - Explain why propanone is soluble in water? Explain why magnesium chloride is soluble in cyclohexane? Question #e3f70 Question #10b88 Question #39b68 Can mixtures be separated by sublimation? What's the difference between a particle and a nano particle? what's their difference on a molecular level? PLEASE HELP ASAP !!! Question #0ef65 Question #6982a Question #65384 Catalyst can change the enthalpy of the reactants? How do we differentiate physical changes from chemical changes? Question #1dc9a Balance the reaction #Zn + HNO_3----> Zn(NO_3)_2 + NH_4NO_3 + H_2O# using ion-electron method? Question #ef731 Question #79d40 Question #574ea Question #7b4a5 Question #daf6e Question #ee307 Question #6774f Question #86a1c Question #3b7a0 Question #86503 Question #23dab Would it make a difference if you waited before putting the metal in the water? Why? Question #bd9b7 Question #729cf Compare the structures of SO3 to PF3 and explain why they have different molecular shapes? Question #e14e4 Compare and contrast the second ionization energies of K and Ca? Question #2f801 Question #45f43 Question #e2194 Question #2496c Using the boyle's law equation, calculate the expected pressure of a fixed amount of gas at constant temoperature based on the given data? Question #b07dc What's the mass of the excess reactant? Question #36547 Question #33bca If the percent ionization of water is #3.67 xx 10^(-7)%# at a certain temperature, what is the #"pH"#? Question #14d7c Question #0b8c5 Write the balanced molecular equation for the neutralization reaction between H2SO4 and KOH in aqueous solution? #AO_2# dispropotionates into #AO_4^-# and #A^(n+)# ion. If the mole ratio of #AO_2# undergoing oxidation and reduction is #2:3#, determine the value of n? Question #b3768 What is the result of Polar covalent bonds? Which solutes are INSOLUBLE in aqueous solution? Question #055dc What kind of polymer is polyvinyl alcohol? How do you know? What is missing in the way electrons are shown in three-dimensional models of both the Bohr and Schrodinger atoms? How do the physical properties of soap allow water to be used to clean grease?? The rate of reaction depends only on the concentration of reactants or also on products? Question #2d354 Where is the mistake in each set of quantum numbers that makes it impossible? a. n=1 l=3 ml=3 ms= 1/2 b. n=2 l=0 ml=-2 ms=0 Question #15472 Question #4f58e What is the molar mass of a gas that exerts a pressure of #94.2*"Torr"#, and has a density of #0.198*g*mL^-1# at #473*K#? What is the average atomic mass of Lithium if 7.42% exists as 6Li (6.015 g/mol) and 92.58% exists as 7Li (7,016 g/mol)? Question #85a0a Question #ee7af Question #87507 Question #b6375 Neon has two major isotopes, Neom-20 and Neon 22. Out of every 250 neon atoms, 225 will be Neon-20 (19.992 g/mol), and 25 will be Neon22 (21.991 g/mol). What is the average atomic mass of Neon? Question #411ee Question #a691a Question #e0501 Question #a021d Question #d9129 You mix about 375 grams of sugar (C12H22O11) with 1255 mL of water (remember: density of water = 1.00 g/mL). What is the molality of the solution? Ammonia gas is synthesized according to the ff equation: N2+H2 to NH3, if 15.0 L of nitrogen are reacted with the excess hydrogen,how many liters of ammonia could be produced? a.5.0L b.15.0L c.30.0L d.50.0L Question #66841 Why are the thickness (or brightness) of spectral lines different? Why can you only add oleum to water to get SO2(g) industrially instead of adding SO3(g) to H2O(l) immediately? Question #60e03 How do you calculate the number of chloride ions in 0.5 mol of Magnesium Chloride? When an electron moves from excited to ground state (n=1), why can't it be seen by the human eye? What is the freezing point of a solution that contains 3.5 mol of the ionic solid BaCl2 dissolved in 500 grams of water? Why the effective nuclear charge (Zeff) of the elements in same group of periodic table are the same? Thank you? Question #0a75e Question #9629b Question #51231 Question #edacf Question #50b54 Question #f4fc7 Please explain me why we use blue cobalt glass in flame test? #A# and #B# react to form #C# and #D# in a reaction that was found to be second order in #A#. The rate constant at #30^@ "C"# is #"0.622 M"^(-1)cdot"min"^(-1)#. What is the half-life of A if #4.10xx10^(-2) "M"# is mixed with excess #B#? How are there #pi# bonds in #B_2# molecule without #sigma# bonds? Question #83ff7 Question #543e6 Question #1ed13 What is the [OH-] of a solution whose [H3O+] is 2.50 x 10-4 ? Why is ozone molecule polar? Question #c1c96 Question #378c6 Question #e8031 Balance the following equation? Ca(OH)2 (s) + (NH4)2 SO4 (s) Õ CaSO4 (s) + H2 O (l) + NH3 (g) Could someone help me to solve the problem? The correct sequence of increasing covalent character is represented by? Question #e8c70 Question #2f58b Question #e76f4 How to solve this redox reaction? Question #aff0b Question #e5a3f Question #0faeb Question #4c875 Question #d3c6e Question #80789 What is the azimuth quantum number? Question #367d8 Question #5ac59 What are the four quantum numbers for the 3rd electron in xenon? In the ground state Cl atom, how many electrons have quantum number #l = 1#? Question #3c1e0 Question #f93d9 Question #c817c Question #84c49 Why do you think it takes about half the energy to remove the first electron, compared to the energy needed to remove the last electron? Question #a0f66 Question #70a74 If we used 0.050 molal solution of Na2SO4 what would be the boiling point? (HINT: first decide if ionic or covalent to figure out “i”). Question #f42dd In the Haber process, Ammonia is produced according to the equation N (g) + 3H (g) Õ 2NH (g). The relationship between the rate of N reduction to the rate of NH formation is? On the hydrolysis of esters according to the reaction: HCOO(aq)+HO(l)HCOOH(aq)+OH(aq) To which the equilibrium will shift, if at a fixed temperature: a. Be deluted (water is added)? b. NaOH is added? c. Pressure is enlarged? Question #3ebf7 Question #0063b Question #46f75 Question #43bf4 Question #9a6c8 Question #090d6 Question #34911 Question #831bf Question #a1ffc Which elements have a greater atomic number than iron? Question #b86f3 Compare the #C-C# bond length of #C_2H_6# and #C_2Cl_6#? Use the concept of hybridization for comparing the bond length. Question #3ed98 Question #7c024 Question #a0129 What is the mass of a nickel slug whose volume is #16.5*mL#? What volume of #0.350*mol*L^-1# #KOH(aq)# is required to react with a #15*mL# volume of #H_2SO_4# whose concentration is #0.250*mol*L^-1# with respect to the diacid? Question #26fd2 Name one non-metal which exists as single atoms? (first 36 elements) Why is there an empty #p# orbital in #"Al"# of #"AlCl"_3?# Question #50273 Question #2334a Question #cbc8b Question #30c97 Help with chem? Question #21c1a Potential energy of electron present in #Li^(2+)# is? Question #128bb A teacher performs a chemistry demonstration in which a small amount of magnesium, Mg, powder is stirred into copper sulfate, #CuSO_4# , solution. ? A chemical reaction is carried out using a 42.65-g sample of lead(II) nitrate, #Pb(NO_3)_2# ? In reaction: 2HO(g)2H(g)+O(g); ΔH=+242 kJ/mol In which direction the equilibrium shifts, if: a. Temperature is increased? b. Temperature is descreased? c. H is added? d. O is reduced? e. Pressure is enlarged? Question #31d45 Which reaction involves a decrease in the bond angle at a carbon atom? A. bromoethane refluxed with ethanolic sodium hydroxide B. complete combustion of methane in air C. ethanol heated with conc. H2SO4 D. polymerisation of ethene Question #a655a Question #a0b96 Which of the following has highest bond energy? Question #fe153 Question #1c7cf What is the mass in grams of #7.9xx10^21# uranium atoms? Question #dcd79 Question #374b5 Which would contain 9.03 × 10^23 oxygen atoms? A) 0.25 mol aluminium oxide B) 0.75 mol sulfur dioxide C) 1.5 mol sulfur trioxide D) 3.0 mol water Question #b2f4d Question #7917a For a fixed amount of gas in a container, calculate the expected volume at the different temperature values given below based on Charles Law? (See values in the details) Question #57105 Question #25534 Question #3b0ed Question #1d0a0 How fast does hydrogen gas diffuse relative to helium? How does #CuCO_3# decompose upon heating? Is cooking bread an endothermic reaction? What is the standard enthalpy of reaction when 6.45g of acetylene are consumed? Question #06b5c Using the boyle's law equation, calculate the expected pressure of a fixed amount of gas at constant temoperature based on the given data? (See the data in details) Question #19989 Question #2e3df Question #6b11b How many carbon atoms in a #1.50*mol# quantity of #"propyl acetate"#? Question #580f0 Question #6dfa1 Question #26481 When zinc chloride is dissolved in water many complexes are formed. How many complexes are formed and what are they ? What is the complex which has the largest Ka? Question #2a89e Question #2ad2a If more than 1 molecule is required to balance an equation, a number is placed out front called a? Question #17e90 Question #4c074 Question #25397 What volume of 0.0250 M HCl and 1.00M HCl must be mixed to give 1 litre of 0.500M HCl ? Question #0938b Question #fc046 Question #050b5 Question #0f39e Question #f6055 Question #fab46 Question #6e6a8 Question #3aa5d Question #4371a Question #b4b48 Question #39e8a Question #9d6c7 Question #3432b Question #1ff4f Question #b7294 Question #883ec Question #1c82f Question #4014f Question #a4911 Question #40076 Question #1a532 Question #0db42 Question #ef753 Question #9d3e3 Question #505f3 Question #064b9 If the elemental composition of an organic molecule is #CH_3Cl_2#, what is the empirical formula? What is the molecular formula if the molecular mass is #147*g*mol^-1#? Question #36679 The formula of the compound is #A_2B_5#. The number of electrons in the outermost orbits of A and B respectively are? Question #50aea Question #52cd1 In which option is the highest velocity of electron? How to separate this mixture physically? Question #f290c Element A has 3 electrons in the outermost orbit and element B has 6 electrons in the outermost orbit. The formula of the compound formed A and B would be? Question #68f96 How do you find the electron configuration of an element in the F block? Question #9ca0b Question #31992 Question #78428 Question #efdb2 Question #6fc6f Question #2aa5c Question #be72f In which of the following options is magnetic quantum number (m) = zero for all the three orbitals in a given option? A) 2s, 2px, 3dxy B) 3s, 2pz, 3dz^2 C) 2s, 2pz, 3dx^2 - y^2 D) 3s, 3px, 3dyz How many electrons are transferred in the following, unbalanced, redox reaction? Cl2(aq) + Kl(aq) => KCl(aq) + l2(aq)? Question #23db4 Question #8e11e Could you list a few ways that would decrease the rate of a chemical reaction? What is the equation for the reaction between lead(II) carbonate and aqueous ammonia? Question #deae1 Question #25440 Question #edefb Question #27764 Question #a5ffc Question #78139 Calculate the pH of a buffer made up of 1.0 M NH3 and 1.0 M NH4Cl. (Ka = 5.6 x 10-10)? Question #57633 Why is fruit inflammable? Question #21709 A patient recieves 9.0 ng of a radioisotope with a half-live of 12 hours. How much will remain in the body (in ng) after 2.0 days? Question #3d23e Question #fe2d2 For a first order reaction the value of rate constant for the reaction #A(g) -> 2B(g) + C(s)#? Question #f8c15 Question #aff5a Question #e4cf3 Question #499be Question #f8580 Question #178ee Question #220f5 Question #d1cc6 How does sodium chloride affect the boiling point of water? What properties are usually possessed by ionic compounds? Which of the following elements has strongest tendency to form electrovalent bond? Question #df5cd Question #12cb7 Question #09295 Calculate the pH of a solution that has a H+ concentration of 1.20 x 10-3 M.? Comment on the aqueous solubilities of #"ethanol"#, #"methanol"#, #"cyclohexanol"#, and #"n-pentanol"# in water? Would the alcohols be mutually soluble? How to calculate the exponents in the differential rate law? Question #5b1c5 Question #20464 Question #7b377 Question #ab6d1 Question #bf660 Why is CuS#O_3# called copper (II) sulfite? Consider the balanced reaction below. How many moles of oxygen would have be consumed to produce 68.1 g water? C3H8+5O2-->3CO2+4H2O Question #ce227 Question #1e810 Question #ecd06 Question #9cca0 Question #1cf8c Question #093e8 Question #6ae2a How do I work out stoichiometric equivalence in dinitrogen fixation? Question #653d6 Question #6cb6f Question #906ac Do kc have any unit? If we dissolved a #250*g# mass of caustic soda in #750*mL# of water, is it possible to achieve a #pH>14#? How do intermolecular forces and the molecular structure of molecules being separated determine the ideal solvent for use in a chromatographic separation? Question #30e8f What is the Lewis structure of #"nitrosyl chloride"#, #NOCl#? Calculate the relative volumes of stock solution required to prepare a 250cm3 of 0.12moldm-3 hydrochloric acid from a 1.0moldm-3 stock solution? Question #f6ced Question #09d18 How do I clean muddy rice? Question #9de05 Is there a membrane that stop liquid water but let Methane gas in? Question #14d37 A compound of hydrogen and oxygen is analyzed and a sample of the compound yields 0.590 g of hydrogen and 9.40 g of oxygen. The molecular mass of this compound is 34.00 g/mol. Find the empirical formula and the molecular formula for the compound? Question #5083f Question #11541 Question #f537c What is the speed of an argon atom that has a de Broglie wavelength of 5.2 pm? Question #532c2 What reaction does magnesium sulfate undergo in water? Why is the boiling point of water higher than would be expected from the trend of Group 6 hydrides? Why is the boiling point of #H_2Te# higher than #H_2Se#? Can any substance has zero ph? Question #92abe What is the final temperature that the water in a bomb calorimeter reaches if #DeltaE_(rxn) = -"2882 kJ/mol"# for the combustion of #"1 mol"# of butane, and the initial temperature was #20.13^@ "C"#? Question #7eca9 Which of the following will have the lowest total vapor pressure at 25°C? Question #21c65 Name the following compounds? (in description) Question #8a83a Calculate the pH buffer composed of 0.12 mol benzoic acid and 0.20 mol of sodium benzoate? Ka = 6.3X10 ^ -5. What weight of potassium chlorate is necessary to prepare 2 liters of a 0.5 m solution. The mole weight of KClo2 is 122.5g? Question #ae7ab Question #e7508 Question #b0875 What is the empirical compound having the following composition: A 36 g sample of iron and oxygen that is 78% iron? Why Chromium has [Ar] 3d5 4s1 and Copper has [Ar] 3d10 4s1? Question #46272 Question #b494c Question #9e3a5 Question #5e7e8 Question #649ce Question #8db45 How I can predict the group and from following configuration? 6s2, 5d1, 4f3 . Does CCl4 have a higher boiling point than CH2Cl2? I though London forces were weaker than dipole-dipole forces? Question #540dd What are the quantum numbers for the forty third electron in Au? If each atomic orbital can accommodate maximum 5 electrons, then the maximum number of elements possible in #8^"th"# period would be? Question #8065b Question #b8311 If 13.8 L of C2H4 at 21 ˚ C and 1.083 atm burns completely in oxygen, calculate the volume of CO2 produced, assuming the CO2 is measured at 44 ˚ C at 0.989 atm.? Question #787e6 How many moles of KBr are present in a 25mL of a 1.5M solution? If the KBr were isolated and dried, how much would it weigh? Is acidic strength directly proportional or inversely proportional to % s-character for organic compounds? Question #909c2 Question #ec05c Question #18acf Free Energy/Gibbs question? Question #ee7ac How do you find concentration of ions? I found the Concentration of the solution now what? Question #708e2 Question #03d7e Question #a5c5e Do ionic compounds have molecular geometry? Question #2c0a4 What is the concentration of perchloric acid if a #24.2*mL# volume of barium hydroxide whose concentration was #0.133*mol*L^-1# was equivalent to an #11.0*mL# volume of the acid? Which of the following exists as discrete (or separate) molecules? a. potassium b. water c. quartz d. carborundum, SiC (hint, this is like a lot of carbons bonded together) e. hydrogen chloride gas 0.585% NaCl solution at 300K has osmotic pressure? How many electron does carbon possess, and how does this influence organic chemistry? Question #69618 Question #9127f Enthalapy help please? Chemistry question? Bond lengths. Question #9adb1 Question #34754 O2+ is paramagnetic or diamagnetic? If V1 x M1 = V2 x M2, then why here 2V1 x M1 = V2 x M2? Question #71a46 Question #715c3 Question #bb603 Question #55ad1 Write balanced half-reactions for the following redox reaction: 3Zn+2(aq)+2Cr+3(aq)+7H2O(l)Õ 3Zn(s)+Cr2O−27(aq)+14H+(aq) Reduction: Oxidation: Can anyone help? Question #f4739 Question #cd0f5 Question #11722 A hydrocarbon, C4H6 absorbs two moles of hydrogen in the presence of platinum as catalyst. The reduction product is inert towards bromine and potassium permanganate. a) what possible structures of C4H6 can be drawn? Question #75086 What is the #pH# of a solution that is prepared from a #4.08*g# mass of calcium hydroxide dissolved in a #1*L# volume? Question #905c7 Question #77aa9 Question #c6ddc Which one of the elements with following outer electronic configurations may exhibit the largest number of oxidation states? Chemistry question? Question #3d31e How do you calculate the number of moles from molarity and volume? How many wavelengths of #Kr_86# are there in one metre? Question #6e503 Question #2a6ca Question #aa702 Which has the lowest ionization energy: #S, S^(2-), S^(2+)#? Why is Ra-226 is more radioactive than U- 238? "Radioactive decay" states an unstable nucleus (U- 238) forms a more stable nucleus (Ra226) by the release of high energy particles and radiation? Calculating enthalpy change? Hess's Law? Question #35273 Osmotic pressure of a solution containing 1g protein in 100 mL solution at 300K is 1.66 bar.What is the molecular weight of protein? Question #2ceef Question #a389e Question #5b84b Enthalapy help? Question #50069 Can you answer questions 19-22? Question #4f3eb Chemistry question? Lattice energy Question #8ab36 Balance the following nuclear equations. #""_(0)^(1) n + ""_(92)^(235) U Õ ""_(36)^(92) Kr + ??? + 3 ""_(0)^(1) n + "energy"# Question #0c188 Calculate the maximum amount of electrical work produced by this cell? Question #08245 Question #8fec4 Question #63a30 Question #edbdd Question #e5eaa Question #39df6 Question #208d5 Question #71507 Question #4e53f Question #c6f13 Question #f756d How many atoms are in 1.00g? Question #78d31 How many moles of MgS2O3 are on 207g of the compound? Question #3fd66 Question #50043 Question #8f89a Ethylene gas burns in air according to equation C2H4(g) + 3O2(g) 2CO2(g)+2H2(l) If 13.8 L of C2H4 at 21 ˚ C and 1.083 atm burns completely in oxygen, calculate the volume of CO2 produced, assuming the CO2 is measured at 44 ˚ C at 0.989 atm? If we have a mixture of sand and sugar, and added water, how would we separate the sand from the sugar? Which resonance structure of NH3- is the best one? Question #73d4d Question #0214d The Schrodinger wave equation for hydrogen atom is given below, where #a_0# is the Bohr radius, #"52.9177 pm"#. If the Radial node in 2s be at #r_0#. Then the value of #r_0# in terms of #a_0# is? When we use a burette in an acid base titration, how many drops are equivalent to a #13.0*mL# volume? Question #d8024 Question #a8a0d Question #bf303 Question #553fb Question #1b548 Question #ce6ba What is going here. Someone please clarify?My doc did not teach us this. Question #e4597 Question #de2d7 Question #38d4e Question #5e30c Can two metals bond together? I know metals and non metals make a ionic bond, and two non metals make a covalent bond, so I was just curious. Question #d2e31 Question #6314c Question #231f5 Question #5e934 Question #323ed Why is it necessary for temperatures to be converted to Kelvin, rather than being represented in Celcius when completing gas law equations? Question #22ae0 Question #e9093 Which element is oxidized and which is reduced? Question #b0fca Determine the pH (to two decimal places) of the solution that is produced by mixing 319 mL of 6.01×10-4 M HBr with 535 mL of 4.51×10-3 M HCl? Compound with no sigma bond? What is the structure of #PCl_5#? Question #d95fe What is the value of ΔG°cell? What is the chemical formula for Y and O? Question #63e36 Equal masses of #"S"_2#, #"S"_4# and #"S"_8# are taken. Highest number of sulphur atoms are present in? Question #641c5 Question #b77b1 How does magnesium metal react with hydrochloric acid? Question #67530 Question #0ffb4 Question #d529f Combustion analysis gives #52.14%# carbon, and #13.15%# hydrogen. The molecular is #46.06*g*mol^-1#. What are the empirical and molecular formulae of the compound? How do you calculate the change in entropy due to heat flow at a constant temperature? Question #606ee Question #1d005 Question #8fb72 Boric acid can take only one electron pair due to absence of d orbital.What does this means? Question #c76d8 Question #36d3c Chemistry question? Identify two ions that have the following ground-state electron configurations. Question #07ef4 Question #5d47c Question #e23f2 Which is more soluble: calcium sulfate or barium sulfate? Question #0e39a Question #7aa8a Write the general chemical equation for this equation ? Question #9f15c Question #914ef Question #8df81 Sodium peroxide is used in orbital stations for air purification.The reaction that takes place is? Is there any link between the solubility constant Ksp and the solubility of the salt with regard to temperature? How much energy is required to ionize an He^+ ion in its ground state? Which orbital could this be.. 4py, 4dyz, 5py or 5dyz? Is hydrogen peroxide thermodynamically stable under standard conditions? How black body radiation confirms the particle nature of light? Question #449e2 Question #4acc1 How does sulfur react with oxygen? Question #48bac Question #ea548 What is the general format of how to do titration problems involving finding the concentration of the original acid solution? Question #20e2a Question #a9f14 Can someone please explain this diagram to me? How do we know that the arrows are supposed to point upwards and not downwards? Why is O2 and C's arrow pointing to the pointing to the products side? Dissolving 5.215g of a solid containing bromide ion to produce a 100.0mL solution. then pipet 25.00mL of this solution and titrate it against 0.1016M silver nitrate solution. 20.56mL is required. Find the % of bromide in the original sample? help please! Would the mods please delete this question....? Question #451b6 Rank from longest to shortest wavelength? Question #7aae7 Question #1cfd0 Question #f8648 Question #1cc98 A solution of NaCl in water contains 25% NaCl (by mass) at 323K. The density of the solution is 1.135kg/lt.Estimate the molality, molality, normality of the solution? Question #4e074 Question #34fea Question #b486f Question #daf18 Why is the structure of copper chloride different from that of barium chloride? Question #e50a4 What is the #"conjugate base"# of #"nitric acid"#? Question #111b1 Question #15c73 Question #1790d Question #eb472 For the questions, use the image below What energy corresponds to the electron affinity of fluorine? What energy corresponds to the 1st ionization energy of potassium? Which energy change corresponds to the negative lattice energy of potassium fluoride? A block of stone has a mass of T tonnes. The density of the stone is 2.5g/cm#^3#. Show that the volume of the block is 0.4T#m^3#? Among the following which is not paramagnetic? Chemistry question? For the hydrogen atom, list the following orbitals in order of increasing energy: 4f, 6s, 3d, 1s, 2p. Question #77802 Question #2a006 Question #284ea A solution at #0# #""^@C# contains a mass of #100*g# with respect to water, and a mass of #40*g# with respect to ammonia. How much more ammonia do we add to saturate the solution? Question #cfdff Question #8d58f Question #d68c8 Question #c884b What is the value of the equilibrium constant at 655 K for each of the following reactions? Question #dd0bd Question #ca4ac Question #979df Determination of the relative molecular mass of compound (a), any help ??? Question #02e5e Scientists store some reactive chemicals in containers filled with argon? How to calculate Ksp for CuSO4 and Ce2(SO4)3? Question #41c83 For the reaction, #N_2O_4(g) rightleftharpoons 2NO_2(g)+Delta#, can you use #"Le Chatelier's principle"# to account for the change in equilibrium when conditions of pressure and temperature are changed? How many liters of a 3.12 M K2SO4 solution are needed to provide 80.3 g of K2SO4(molar mass 174.01 g/mol)? Recall that M is equivalent to mol/L. Can anyone tell me the Number of Ca, P, O, Mg and atoms in the following: Mg3(PO2) (s) + 3 Ca(NO2) 2 (aq)? Question #d9427 I have a little bit confusion regarding word fused, MnO2 is fused with KOH. What does it mean by word fused? Please explain specifically. Thanks What is the lewis dot structure of nitrate ion? What kind of reaction is C4H10 (g) O2 (g)? What are the correct coefficents for Mg(s) + N2 Mg3N2? Question #4c916 Question #cc045 Question #b86b7 Question #28c42 Question #1664f Question #da841 Question #39b08 Question #1222d Question #27ca8 Question #a7c09 Question #53712 Question #44d55 Question #ba15d Question #cbaa9 Question #d4c86 Question #e669d Question #3067d Question #39354 Question #ae863 Question #42ac8 What is the concentration of a solution formed by diluting 14.0 mL of a 4.4 M glucose solution to 355 mL? What are the electronic charges on hydrogen sulfide or the dihydrogen molecule? Question #b193a The electronic configuration of gadolinium (Atomic number 64) is? Question #01511 Correct order of freezing point of given solution ? 1) 0.1 M glucose 2) 0.2 M urea 3) 0.1 M NaCl 4) 0.05 M #CaCl_2# Question #a09cc Question #66d23 The average osmotic pressure of human blood is 7.8bar at 310K.What is the concentration of an aqueous NaCl solution that could be used in the blood stream? Question #2779a Question #3aab1 Question #af976 Question #ef310 Why is #n-C_10 H_22# boiling point higher than #Br_2# boiling point? Question #5f7d8 Question #e45ba Question #a205b Question #117fe Question #cc02b How many right angles are there in a #"XeF"_5^"+"# ion? Question #a880d Question #c8a25 Simple Chemistry Question, Please Help!? I thought this would be as easy as adding, but I keep getting the wrong answer Question #65c70 Question #14fe2 Question #1427c Question #20073 Question #01f42 Question #c93c7 Question #ca054 Question #15d0a Question #9ca81 Question #46a2c Question #d03b8 What physical property of hydrocarbons is used for fractionation? Why is phenolphthalein a good indicator for acid-base titrations? Question #08232 Question #9341d Question #d0a6d Question #166cc Question #e0513 Question #d733e Lets assume that you were unable to stop the NaOH flow at the end point and you added extra NaOH to the solution. How would this affect your perfect acetic acid calculation? How is #""^26Al# possible? Question #2b76b Question #bd023 What happens on increasing the temperature of an endothermic reaction according to le chatlier principle? Question #4fd2e Question #5e3a7 How many grams of S are contained in 125.9g of Ga2(SO4)3? Question #fa792 Question #0d64f Question #b69a2 Question #6eace Question #83311 Question #a9008 Question #361ac Automatic antifreeze consists of ethylene glycol. Calculate the boiling point and freezing point of a 25% by mass solution of ethylene glycol in water? What is the condensed electron configuration of praseodymium? Question #8ba29 Question #03c19 Question #a28b3 Question #3cd86 Question #3a57b Question #d5595 Question #29a09 How many moles are in #1*kg# of #NaOH(s)#? Question #fde0c Question #6a428 Question #557d1 Question #dec65 If 250 mL of a solution contains 7.75 g of vinegar, what is the vinegar concentration in the solution (percentage and molarity)? Show all your work! Assume the solution has a density of 1 g/mL? Question #ce0f3 Question #f0083 Write the ionization equations for the dissolution of sodium phosphate, barium sulfate, silver chloride, calcium hydroxide, and sodium bromide in water? Question #9ce3c What is the concentration of a solution of K2CO3 that has pH = 11.90? (For H2CO3, Ka1 = 4.2 x 10–7, Ka2 = 4.8 x 10^–11.) (A) 3.0 x 10^–1 M (B) 2.6 x 10^–2 M (C) 7.9 x 10^–3 M (D) 1.3 x 10^–12 M Charles’ Law allows the prediction of gas volumes at different temperatures. What would the volume of a gas be at 38.3 C if it started at a volume of 45.7mL and a temperature of -58.5 C? Question #1f82d MO diagram for #"C"_2"^(2-)#? Question #b3403 Question #59f9b Question #163a8 Assume that there were 5.5 g NaHCO3 and 5.5 g of HCl mixed in a reaction vessel? write the balanced equation for the reaction and find the limiting reagent in this reaction. Question #ecbc2 Question #b2f7a 100 ml of 0.3N HCl solution is mixed with 200ml of 0.6N H2SO4 solution what is the normality of H2SO4 in the final solution? A 10 L flask contains 2g of CH4,3g of hydrogen and 4g of nitrogen at 20 ˚ C. a. What is the pressure, in atm inside the flask? b. What is the partial pressure of each component of the mixture of gases? You have two acids. One solution is the weak acid HF, the other solution is the strong acid HCl. You find that both solutions have the same concentration of H3O+ at equilibrium. Which relationship is true about these two solutions at equilibrium? How much heat (kJ) is released when 50 g of ethanol is reacted with excess oxygen? Question #33f81 Question #9affb Question #c5ea8 You are asked to prepare a 225.0 mL of 0.080 M solution of acetic acid. Calculate how many grams of acetic acid will present in this solution. Acetic acid comes as a liquid. If the density of acetic acid is 1.1010g/mL, how many milliliters of acetic acid? What is the [OH-] of a solution whose pH is 2.45? Question #ad5fe What is the pH of a HCl solution which is 5.0 x 10-2 M? Question #724af Question #a52c4 Question #1a48a How does the #"law of conservation of mass"# apply to chemical reactions? How do I represent the redox reaction when copper metal is oxidized to #Cu^(2+)# by the action of nitric acid, the which is reduced to #NO_2(g)#, and #NO(g)#? Question #51baf Question #bc067 Question #9c5bc Question #b01f2 Question #7309a Question #95094 Question #43af5 Question #a66a0 Question #968b3 Question #a724e Question #b40b4 Question #e7abc Question #5c5bd Question #cd6fa How would the ionization energies of nitrogen and phosphorus compare? 1.00 g of alkali metal carbonate, #M_2CO_3#, is dissolved in water and made up to #250 cm^3# in a volumetric flask. #25.00 cm^3# portions of this solution are titrated against 0.113M hydrochloric acid. The average titre is #12.80cm^3#. What element is M? Question #b75db Hydrogen bonding does not occur in which of the following solvents: #"A. hydrogen fluoride;"# #"B. ammonia;"# #"C. water;"# #"D. diethyl ether?"# Question #ec39a What is the amount of change in the reaction? Using of following table, calculating the amount of change in enthalpy for the combustion of ethanol, as described by the reaction below: 2C2H5OH + 7O2 - 4CO2+ 6H2O What type(s) of intermolecular bonding do each of the structures contain? Do all Isomers have the same melting point/boiling point? Why or why not? Question #8a0f4 Chemistry question. Are these statements true or false? Question #fec62 Question #30682 The quantum numbers n = 4, l = 1, m_l = 0 could represent a valence electron in which atom in its ground state? Question #ff48a Question #08cfb Question #5dea3 Which is the WEAKEST bond: covalent; hydrogen-bonding; metallic bond; ionic bond? Question #1429a Question #0124f Question #b7cd7 What are the oxidation numbers of each element in #"oxalic acid"#, #C_2H_2O_4#? Question #1de9c What is the general format used to find the concentration of an ion in a chemical equation? Question #9a91c What is the mass of a #0.03*mol# quantity of sodium carbonate? How many grams of hydrogen gas are needed to react with 5 moles of oxygen gas? Why is #Ca(NO_3)_2# a ionic bond? I thought all of them are nonmetals so it should be a covalent bond? Question #7340e What is the number of oxygen molecules needed to produce 3.232 g of water? Question #35b03 Question #abd2d Question #09b60 A solution is made by dissolving 75.0 grams of glucose to enough water to make 2.00 liters (this is solution A). Then, 50.0 mL of solution A is diluted by adding 750.0 mL of water to it to make solution B. What is the concentration of solution B? How do you know which ions remain in solution? Question #46bd0 Question #eed2c Question #80dc5 Question #43d6b Question #b2c68 18g of glucose is added to 178.2g of water.The vapour pressure of this aqueous solution at 373K is? What is the partial pressure of xenon gas in a gaseous mixture that exerts #2.30*atm# pressure, and the partial pressure of helium, and argon, are #0.250*atm#, and #0.450*atm# respectively? How many grams of Li will be needed to produce 27.93 grams of LiOH upon reaction with H2O? Question #90336 Question #e4e7a Question #0ac46 Explain why the boiling point of sodium chloride( NaCl) is so much higher than ALCL3 and PCL3 ? Calculate the volume of this stock solution required to prepare 1500ml of 0. 025M of acetone? How do we write the equilibrium expressions for..? #(a)# #2NO_2(g) rightleftharpoons N_2O_4(g)# #(b)# #C(s) + CO_2(g) rightleftharpoons 2CO(g)# #(c)# # H_2CO_3(aq) + H_2O rightleftharpoons HCO_3^(-) + H_3O^+# #(d)# # PbS(s) rightleftharpoons Pb^(2+)# How many grams of Pb are present in 1.8 x 1022 molecules of Lead (II) Iodide? Question #7b499 Question #3afc0 Question #bf6d6 What is the total number of orbitals possible at the #n = 4# energy level? Question #474bc Question #3e380 Question #7f20d Question #ef418 Question #0e871 Why is it easier to oxidise #Fe^(2+)# to #Fe^(3+)# than it is to oxidise #Mn^(2+)# to #Mn^(3+)#? Question #4f3ed Iron and copper metals are coated by tin plating for their protection form corrosion and poisoning, what is the meaning of poising here? Thanks a lot. Question #6c8df Question #d06e2 Question #de313 Question #7ec0e Question #f17d6 An hydrocarbon is #85%# by mass with respect to carbon, and has a molar mass of #28*g*mol^-1#. What is its molecular formula? At #"STP"# what volume would an #11*g# mass of oxygen occupy? How many milliliters of a 2.6 M glucose solution contains 0.86 moles? Question #c3b40 Give the formula of an ionic compound formed by an element in group 2 and show the charge on each ion.? Question #172bb Question #e64b6 The volume of a balloon is 6.52 L at 32.5 ºC and 762 mm Hg pressure. What volume in mL will the balloon have at standard temperature and pressure (STP)? Question #c4f0a Question #cbfea Question #5f786 25.43mL of 0.09864M NaOH reacts completely with 0.1348g of a diprotic acid. what is the molar mass of the acid? Help please I'm so lost! The density of a test gas is to be determined experimentally at 302.2 K using an apparatus constructed of a 4.350 L glass bulb volume that is attached to a vacuum pump. The mass of the evacuated bulb is 21.072 g.? Question #f3463 How does copper carbonate behave in aqueous solution? What occurs when (i) nitric acid, and (ii) ammonia is added to the mixture? Question #c3e3d Question #a848c How do I learn the gas laws? Question #43088 Question #4201f A tablet contains the same number of moles of CaCO3 and MgCO3. One tablet reacted with excess hydrochloric acid to produce 0.44g of Carbon Dioxide. CaCO3 + 2HCl = CaCl2 + CO2 + H2O MgCO3 + 2HCl = MgCl2 + CO2 + H2O How many moles of CaCO3 are in a tablet? Question #6262e Question #22317 Can electronegativity affect the viscosity of liquid? A tablet contains CaCO3 and reacted with excess hydrochloric acid to produce 0.44g of Carbon Dioxide. CaCO3 + 2HCl = CaCl2 + CO2 + H2O MgCO3 + 2HCl = MgCl2 + CO2 + H2O How many moles of CaCO3 are in a tablet? How to draw Lewis Structure for HCN? Question #1d814 Question #ac923 Question #b4129 Question #36fb8 Question #19e41 Question #63aed What is the oxidation state of vanadium in the products? Explain how you got your answer Question #2354f Question #d3a63 Question #54362 Question #4b558 Question #42f24 Question #6e8af Question #43517 Question #4f5a8 Question #4d805 Question #156e0 I want to create pressure inside a container in which I am heating someting so that it get heated after its boiling point? Buoyancy for the Goodyear blimp Spirit of Innovation comes from 203,000 ft3 of helium. Calculate the mass of this much helium at 22.00 °C and 0.987 atm pressure.? Question #7207e Question #9d8c9 Question #9d99c Question #bdda6 Question #2a3ce Question #8dad9 I have confusion: 1 debye = #10^ -18# esu cm = #3.335 xx 10^30# C-m ( coulomb meter), How it is? please prove. Thanks. Question #e4cf6 Question #c7805 Question #1ee7c Question #f0c1b Question #baa89 Question #f17a7 Question #784a5 Question #5ec08 Question #9f08d Question #a20c8 One mole of non volatile solute is dissolved in two moles of water.The vapour pressure of the solution relative to that of water is? Question #e8ff3 in electrolysis why hydroxide is easier to be oxidized than sulphate ? Question #7665e Question #64e64 What is the concentration of solution in which #2*g# of solvent has been dissolved in #1*dm^3# of solvent? Write the chemical reaction that occurs between aqueous ammonia and solid copper(II) phosphate? Question #13cae Question #d0b56 Which molecule would have the largest dispersion molecules forces? Question #5f874 Question #26993 Question #33fc6 Question #444db Question #d8e9d What metals are likely to be found as compounds in nature? Question #7df2f Question #07541 Question #1c514 How does the effect of concentration and pressure affect #K_p#? Question #309c7 Question #0723e What type of bond is formed between chlorine and element of atomic number 19, explain why this chloride is a high melting point solid? The molarity of 98% H2SO4 (d=1.8g/ml) by weight is ? A solution of #"1.25 g"# of a non-electrolyte in #"20 g"# of water freezes at #"271.94 K"#. If #K_f = "1.86 K"cdot"m"^(-1)#, then the molecular weight of the solute is? Question #fc7d0 Question #a9877 Question #49dd7 Uncharged atoms have the same number of #[" "" "]# as #[" "" "]#? SO2 + Cl2 = SO2Cl2 If 8g of SO2 is mixed with 14.2g of Cl2, and one mole of SO2Cl2 is 135g, What is the number of moles in Cl2 (chlorine) and SO2 (sulfur dioxide)? Question #e9bf6 Question #b7f58 How many sigma and pi bonds are in SeO3 2-? For the reaction #"H"_2 + "I"_2 "2HI"#, what is the reaction rate if the concentration of hydrogen decreases from 0.50 mol/L to 0.20 mol/L in 1.0 min? How do I make a #1:6# dilution of #"water"# to #"concentrated nitric acid"#? Question #60b21 Question #d22f0 Question #5cd86 Question #16259 Without looking at formulas, how can you distinguish compounds from solutions? How many liters of carbon dioxide are released when 355 grams of pentane (#C_5H_10#) is burned in air at STP? How is construction of standard hydrogen electrode done? Question #b644d In terms of moles, what will be the effect of doubling the mass of a sample of copper sulfate pentahydrate from #3*g# to #6*g#? When a strong base is added to a solution of CuSO4, which is pale blue, a precipitate forms and the solution above the precipitate is colorless. When ammonia is then added, the precipitate dissolves and the solution turns a deep navy blue. Net equation? Question #b2c83 Question #187d6 Question #35f10 Question #0e77c What is the formula of cuprous iodide? I have read Cu I and Cu2Cl2 both. Please remove the confusion. Question #eb3a7 Question #cf0ee What is #["Ni"^(2+)]# at equilibrium upon formation of #"Ni"("NH"_3)_6^(2+)# from #"1 mmol"# of #"Ni"^(2+)# in #"230.0 mL"# aqueous solution containing #"0.300 M NH"_3#? #"500.0 mL"# of solution contains #0.750# millimoles of #"Co"("NO"_3)_2#, #125.0# millimoles of #"NH"_3#, and #100.0# millimoles of ethylenediamine. What is the equilibrium concentration of #"Co"^(2+)# for this complexation reaction? Question #c3fd1 Question #7da63 Question #4d20f Question #6b6db Question #1e971 Ionic equilibrium problem...?proof needed.... Question #253a4 Question #e96ec The following boiling points for noble gases.A) Name a type of forces that exist between the atoms? B) Suggest a reason for the icrease in boiling point? Question #aec2f A #635.4*mL# volume of ammonium persulfate at #0.500*mol*L^-1# concentration was mixed with a #125.0*mL# volume of a #1.25*mol*L^-1# concentration of the same solute. What is the final concentration with respect to #(NH_4)_2S_2O_8#? Question #0ace6 Question #7482e Question #756bb Question #7d55f Question #22544 Question #9e61c Question #ff6f1 Question #d242a Question #8be9b Question #32460 Could someone explain the lewis structure diagram of covalent compound Al2Cl6? Question #b8d4d Which is not true about 1mole of oxygen gas at S.T.P? A)it occupies 22.4litters B) it's gram molecular mass is 16gram C) it's gram molecular mass is 32gram D)none? Thanks Question #caaed Question #1f711 Question #d7a68 Question #02db9 Question #d9506 Question #e9caa Question #8cb8b Question #a18b3 Question #60eb8 Question #6b5e3 Question #f2f5a Question #a28ff Question #342d1 Question #fede8 Question #3342a Name the bond responsible for the force of attraction between water molecules and comment briefly on its effects on the properties of water? Question #22b4a Question #ff779 Question #ce4ad Question #147f3 Question #827fe Question #1c8a6 What is the weight of an anhydrous solvent required to make a certain volume of solution ? Question #7bf45 Question #c655c Question #db636 Question #14b0e Question #af73a Question #b0f7b Question #124ce Question #59501 Question #3df50 Question #4ce19 Question #d923a Question #6d3ed Question #f23da Question #a1a4b Question #bd69e Question #20536 Question #4c1ba What is the mass of the solution when #40*g# solute are dissolved in a #200*mL# volume of water? What is the ratio of #[Pb^2+]# to #[I^-]# in a saturated solution of #PbI_2#? Question #f48df How many electrons are there in an aluminum atom? Question #5ce3f Question #1e40e Question #e98c0 Question #0b407 Question #e6564 Question #5815b Question #ea45d Question #46899 Question #277a4 Question #0f6e9 The volume of a balloon is 6.52 L at 32.5 ºC and 762 mm Hg pressure. What volume in mL will the balloon have at standard temperature and pressure (STP)? Question #719e6 Question #9cbb8 Why Silver Nitrate is soluble in organic solvents like ethanol and pyridine? Question #1539b Question #6cd21 Question #12543 Question #00ed5 How does a formula unit differs from molecular formula? Explain. Question #37fcb Question #2fac0 Question #59eb8 Question #41239 Question #1ee14 Question #26890 What is the pressure of a gas in kPa if 0.250 moles of the gas occupies a volume of 4.75 liters at 273 K? Question #d639d If the pressure exerted by 0.0735 moles of a gas is 1.05 atm and the volume is 2050 mL, what is the temperature of the sample in Celsius? Is there a short trick for calculating the number of isomers of a compound? The standard enthalpies of formation, ΔHfΔHf, for C2H2(g), O2(g), CO(g), H2O(g), and CO2(g) are given in the table. Use this information to calculate the overall heat of the reaction that converts 1 mole of C2H2(g) and a stoichiometric amount of O2(g).? A reaction has a standard free-energy change of –19.60 kJ mol–1 (–4.685 kcal mol–1). Calculate the equilibrium constant for the reaction at 25 °C? Question #68e4f Question #6c126 Question #6b2d3 Question #f1323 What is the order of decreasing solubility of enanthic acid, malonic acid, and pimelic acid? Question #8e7c0 Question #0e62e Question #d0636 (a) What are the molar concentrations of #"CuSO"_4# and #"FeSO"_4# after 2.5 g of iron have reacted with 100 mL of 0.75 mol/L #"CuSO"_4#? (b) What is the mass of copper produced? Whats a vapor pressure? Hydrogen bonding exists in HF but now in HCL.Explain? Question #2711e Question #a7eea Carbon dioxide has two polar bonds but it is a non-polar molecule, Explain? Question #1879f Question #37d20 What mass of carbon dioxide is produced from complete combustion of a #6.85*g# mass of ethanol? What mass of dioxygen is required for the combustion? Question #7d12e Question #973ef Question #b1e8b In a #75*g# mass of methane, what is the mass of hydrogen? Question #ee92e Question #a90d0 Question #3252b Question #dc3a5 Question #2f46b What are the intermolecular forces in KOH? Question #c2b70 Question #6f60d Question #6f63a Question #1588e Question #a8b65 How many moles of sodium hydroxide are required to neutralize a #1*L# volume of #0.50*mol*L^-1# sulfuric acid? Question #4eb00 Question #c53b2 Question #13daa Question #f3c4e Question #69f8f Question #8a46f Calculate the enthalpy when 850.0g of ice melts ΔH_fusion for ice=6009.5 J/mol? Question #6d0d9 Question #0a833 Question #b9d16 Question #d9942 Question #ca3d4 Question #5c89f Question #c6944 Question #78a3a Question #7dab9 Question #62045 Question #29f73 Question #0220b Question #53b19 Question #73080 Question #f6b4c Question #b6068 Question #07a6c Question #db8ce Question #87c89 Question #44ca3 Question #fb0c4 How are oxidation numbers conceived and assigned? Question #2306b Question #1f415 Question #d5914 Question #2393b Question #56f87 Question #02b46 Question #1762d Question #9bc83 Question #f5ff0 Question #10db3 Question #f69cb Question #f2118 Question #1660b Question #7b3fa Question #8e98a Question #7d4ea Question #075e6 Question #f33a3 Question #da734 Which would you expect to have the higher melting point(or boiling point): C8H18 or C4H10? Explain Question #6fb36 Comment on the nature of the bonds you would expect to find in each of the compounds MgS and PH3? Question #bb1c4 Question #08c43 Question #def0a Question #2ebc6 Question #51b1d Question #1bd73 Given #2NH_3(g) + 3O_2(g) rightleftharpoons2N_2(g)+3H_2O(l)+Delta#, what will be effects of: (a) adding ammonia.. ;(b) adding water.. ;(c) dinitrogen is removed... ;(d) if heat is added... ;(e) if dioxygen is added.. ;(f) if the volume is increased? Question #18a97 Question #3b75e Question #c9cf5 Question #04ef8 Question #55b54 How would you represent the oxidation of elemental phosphorus to give #HPO_4^(2-)#? Question #911b2 What volume of 0.05M #sf(KOH)# will neutralise 50 ml of 0.1M #sf(H_2SO_4)# ? Question #97bae Question #86b83 Question #bad48 Question #72ab4 Question #472ee Question #48f99 Question #3b1cf Question #4386d Question #432af What is the frequency of a radio wave with an energy of 2.672 × 10−24 J/photon? Question #eca74 Question #885e3 Question #ab55f Question #587dc Question #516be Question #247cb Question #74309 Question #92ad5 Question #2d8b3 Question #88cfd Question #45b7e If the density of benzene is #0.8786*g*mL^-1#, what is the mass of a #175.4*mL# volume? Question #17573 How many formula units of magnesium chloride could be made from 15 atoms of magnesium, and 20 chlorine atoms? Question #41f1c What is the net ionic equations for the formation of each of the precipitates observed? The reaction of sulfur trioxide with atmospheric water droplets results in sulfuric acid, a contributor to acid rain.According to the equation below, how many moles of sulfuric acid can you predict will be formed from 58.0 g of SO3 and an excess of water? How many sigma bonds and pi bonds are in O3? Question #2297b Question #51f76 Question #02807 Question #9b777 Question #aca0f Question #a5092 Question #4ae5f Question #f84ad Question #9846d Question #d0d7d Why is hydrogen peroxide stored in cold temperatures? Question #bc7bc Question #9df93 When the equation cacO3+HCl=CaCl2+H20+CO2 is balanced the coefficient of HCl is: A)2 B)1 C)3 D)all of the above? Thanks In the reaction H2+Cl2~2HCl.so A) hydrogen is oxidized B) chlorine is reduced C) chlorine is an oxidizing agent D)all of the above? Thanks Why are physical changes generally reversible? If you were given 1 mole of 5cent coins would you be a millionaire? Calculate how many dollars you would have. How many atoms are of each element are there in 9.8 g of sulphuric acid, G2SO4 ? ( atomic mass, H=1 , S=32 , O=16) What are the individual oxidation states for the constituent atoms of #Li_2SO_4#, #"lithium sulfate"#, and #Ba(OH)_2#, #"barium hydroxide"#? Question #37265 Question #4690b Question #98580 Question #5b693 Question #b8d7f Question #60cf6 Question #e7174 Question #82e89 Question #34e0e Question #ab8a1 Question #ea1f2 Question #10111 Question #0460e Question #8dab3 Question #b7b21 Question #5b348 A substance that changes the rate of a reaction without itself undergoing any net change is A) oxidizing agent B) Reducing agent C) Catalyst D)none? Question #f5b48 Question #88a40 Question #e4895 Question #da3e6 Question #fc973 Question #3e433 Question #d262f Question #f66d2 What is the concentration of the acid if the initial burette reading is 2.14 mL and the burette reading when the endpoint observed was 21.62 mL? Question #d6a13 Question #c02d7 What is the major factor that accounts for most of the difference in these two values of pressure (ideal gas law vs. van der Waals equation)? Question #514be Question #97b39 Question #9ca84 Question #2f673 12grams of magnesium is made to react with enough amount of HCl.what volume of hydrogen gas will be collected at S.T.P? THANKS Calculate The gram molecular masses of the following A)cacO3 B)H2O2? Thanks Question #d8e6e Question #9b974 How many litters of hydrogen are needed to react with 2.24litters of nitrogen to produce ammonia gas? Thanks A chemist wishes to make a solution using 4.41 g of CoCl3 in which the total concentration of Cl– ions is equal to 0.333 mol/L. What must the final volume of the solution be? In order for [Cl-] to equal 0.333 M, what must [CoCl3] equal? Question #a0b4e Question #c132c How does a lifesaver react with water? Question #98ff1 Question #f6087 Question #868d9 Question #f7768 Question #3e917 Question #2cd94 How many moles of calcium phosphate are in 1.0 x 10-3 g calcium phosphate? a) 0.310 b) 0.008 c) 8 d) 1.94 x 1018 e) 3.22 x 10-6 Question #b2a08 How do I write the overall ionic equation for 2H3PO4(aq)+3Ba(OH)2=6H2O(l)+Ba3(PO4)2(s)? Question #f929f Question #dfd7c Question #5b42b Question #836e7 Question #e6c3b Question #7175e Question #daf2d Question #0733e Question #b07d9 Question #aaaec How many sigm and pi bonds are on KOH? What information is conveyed by an atomic symbol? Question #f1e22 Question #a9110 Question #1cbcb Question #f193d Question #a986a Question #67548 What is the sulfur oxidation state in #SO_3^(2-),SO_4^(2-),S_2O_3^(2-)#? Calculate the heat capacity of a calorimeter if the combustion of 5.000 g of benzoic acid led to a temperature increase of 20.00 °C. The heat of combustion of benzoic acid is -26.38 kJ/g. ? 3 Consider three 1-L flasks at the same temperature and pressure:Flask A contains CO gas, flask B contains N2 gas, and flask C contains O2 gas. Which contains the lowest density? Question #04196 Question #30f33 Question #32917 Carbon has three naturally occurring isotopes: C-12 with a mass of 12.00 amu and natural abundance of 98.89%, C-13 with a mass of 13.00 amu and natural abundance of 1.110%. Calculate the atomic mass of carbon. (The abundance of C-14 is negligibly small.)? Question #cd9fe Question #1a784 What is the ratio of the mass of an #alpha-"particle"# to the electronic mass? Question #dd443 Question #68d45 Question #a5fac Question #d14c3 Question #781c0 Question #8692a Question #bf22e Question #08e8d Question #b7c23 Question #7fb40 Question #a2804 Question #d497c Question #c1aeb Question #35623 Question #32454 Question #2e00d Question #e4095 Question #2bd7b How do we assess the maximum valency of elements on the Periodic Table? Question #d0eca Question #e210c Equal volumes of #1.0*mol*L^-1# concentrations of silver nitrate and sodium chloride solutions are mixed to make #1.0*L#. What are the new concentrations of dissolved salts? Question #05d81 Question #fc6c1 Question #8c624 Question #9b9d6 Question #ce97f You have 100g of radioactive plutonium-239 with a half-life of 24,000 years. how much will remain after (a) 12,000 years, (b) 24,000 years, and (c) 96,000 years? Why is it ok to wash the sides of a flask with DI water during titration even though you are diluting the acid present? Question #a9c10 Question #d628f Determine the energy of a photon whose frequency is 5.28 × 1017 Hz? Question #36608 Question #a348e How many milliliters of a 0.160 M potassium chloride solution should be added to 49.0 mL of a 0.270 M lead(II) nitrate solution to precipitate all of the lead(II) ion? How many moles are in a #200*cm^3# volume of a solution whose concentration is #0.025*mol*dm^-3#? Question #b1262 Question #9a99f Question #59699 Question #57a22 Question #7a2e4 Question #c5296 Question #2c2b5 Question #a506f Question #bc7ca Question #ef9c4 Question #c59ff Question #24c4f Question #32ebc Represent the reaction between lead nitrate and sodium sulfate in aqueous solution? Question #56268 Question #50544 Question #80067 Question #a3e90 Question #701c3 Question #ade69 Question #56551 Question #fba03 Why d block elements are called outer transition elements? Concisely please. Question #aac10 1)Balance the Reaction between:CuO+NH3--Cu+N2+H2? Thank you Question #5ccda Question #aa8ef Question #cc3c1 Out of the gases He, Ne, Kr, and Xe, which one is least likely to obey the ideal gas laws at very high pressures and very low temperatures and why? Question #a5dc5 Question #5613c If volume decreases, how does density change? Question #60b23 Question #ba7a1 Question #c7c31 Question #38318 Question #4c7d4 Question #a413f Question #36811 What is the most dominant IMF in KOH? Question #3f66d Question #1185f Question #744cf How many water molecules in a #3.64*g# mass of water? Write the equilibrium constant expression and calculate the value given? [SO2] = 0.10 M, [O2] = 0.12 M, and [SO3] = 0.60 M, for the following equilibrium: 22() + 2() 23() Question #8330b Question #dbb50 How many lone pairs are in KOH? Question #708da 0.5 g of a base was completely neutralised by 100 ml of 0.2 N acid. equivalent weight of the base is?? Question #cf6e6 Question #63dde Question #bb037 Question #56e82 Question #03077 Question #3271e Question #88340 Question #1e625 Question #be1cf Question #fe104 Question #544a2 Question #170b5 Question #02076 Why is the formula for dihydrogen monoxide the same? Is dihydrogen monoxide the same as DHMO? How could you isolate #CuCl_2# from #CuCO_3#? How many sodium and hydroxide ions are present in a #0.5*mol# sample of sodium hydroxide? Question #ed69d What is the #pH# of a buffer consisting of #150*mL# of #0.30*mol*L^-1# #NH_3(aq)#, and #150*mL# of #0.30*mol*L^-1# #NH_4^(+)#? Write a net ionic equation for the reaction that occurs when aqueous solutions of hydrochloric acid and potassium hydroxide are combined? Question #e3e81 Question #1bea6 A mouthwash, which comes in a concentrated syrup, contains red dye 40. The red dye 40 syrup is diluted by a factor of 2 three times. If the red dye 40 concentration is #6.60xx10^-3" M"# in the original syrup, what is its concentration in dilution 3? Question #b22e0 Question #fe26e Question #e3138 Question #a92d3 Many homeowners treat their lawns with CaCO3(s) to reduce the acidity of the soil. Write a net ionic equation for the reaction of CaCO3(s) with a strong acid? What is another name for dihydrogen monoxide (DHMO)? Thanks! :) Question #87860 Question #e49bd Question #1d433 Question #a394c Question #de231 A container holds a quantity of argon gas, and exerts a pressure of #0.0850*atm#. Oxygen is introduced into the container. How does #P_"Ar"# evolve? Question #294fe Question #eea4e How do you represent the dissolution of sulfur dioxide in water in an ionic form? Question #d5f37 Question #36f95 Question #8ef59 Question #6df1b Question #813a9 Question #92862 Question #054e6 Question #057bc Question #4eb1a Question #5b9d5 A nuclide has a mass of #56*"amu"#. If #Z=26#, what is the identity of this nuclide, and how many neutrons are present in its nucleus? How do we know that there is no element between sulfur and chlorine? Question #e86d3 A #10.3*g# of nitrogen gas reacts with a #58.8*g# mass of fluorine gas to give #NF_3(g)#. Which is the reagent in excess? Question #16650 Question #a75cc How is formation of #AgCl# represented? Question #7357d Question #e6e7e Question #ff286 Question #dfd38 If an isotope has a half-life of 120 days, when will its activity be down to one fourth? Question #ae4e3 Question #46f31 Question #4c074 Question #c829a Question #67d08 Can you represent the oxidation of ethyl alcohol to acetic acid given a dichromate oxidant by means of half-equations? Question #83e32 What are the individual masses of the elements in a three mole quantity of #Al_2(SO_4)_3#? Is #"V"("CN")_6^(3-)# diamagnetic or paramagnetic? Question #691b3 Question #e88b7 Write the chemical equations representing the stepwise, partial ionization reactions of malonic acid, a diprotic acid with a chemical formula of H2C3H2O4. The acidic hydrogens are shown at the front of the formula. Include water and states of matter.? What is the concentration of a solution prepared from half a mole of solute and #1*L# of solvent? Which of the following is the reaction associated with the electron affinity of magnesium? -Mg(g) Õ Mg+(g) + e- -Mg(g) Õ Mg2+(g) + 2e- -Mg(g) + 2e- Õ Mg2-(g) -Mg(g) + e- Õ Mg-(g) -Mg(g) Õ Mg-(g) + eQuestion #b383b Question #10300 If we have a #432*g# mass of lead, how many moles of lead does this represent? Question #10a99 Question #8bf51 Question #57c9f Question #bb987 Question #c33de Question #d8c09 Question #250c5 When calcium sulfate is added to sodium carbonate, how much calcium carbonate precipitates? If 1 mole of H2SO4 is dissolved in water, how many moles of hydroxonium ions are produced? Question #73964 Question #f6828 Question #7b3e0 How do we separate a solid material from a supernatant liquid? Question #38fca Question #12339 Question #5e5b6 How many moles are present in #6.033xx10^23# atoms of carbon? How do you rationalize the physical states of the halogen molecules versus the #HF# molecule? Given the NH3 change reaction equation: N2 + 3H2 Õ 2NH3 Determine the ratio of reaction rates N2, H2, and NH3? Question #86a11 Question #5ad7a Question #91f0c Question #11fbe Question #189c4 Question #bb20a Why do you wash with water the reaction mixture of hexene made by dehydration of hexanol with phosphoric acid? Question #e57e1 Question #710cf Question #6cd77 Question #99479 Is #BeF_2# ionic or covalent? [Ag(NH3)2] [Ag(NO2)2], name according to IUPAC?? Question #de37e Question #e6d24 Question #9f130 Question #c8229 Chemistry question? Will calcium fluoride be more soluble in a solution of potassium fluoride or in pure water? Question #4d280 Question #2d1be Question #4c6de Question #0234f Question #6db8f Question #99a7d Question #dc9cd Question #c9c13 Thiosulfate anion reduces triiodide to iodide, itself oxidized to #S_4O_6^(2-)#. What is #[I_3^-]# if #30*mL# of #0.440*mol*L^-1# of #S_2O_3^(2-)# solution were required for equivalence? Write a net ionic equation for the reaction that occurs when aqueous solutions of ammonia and nitric acid are combined? Question #60182 Question #d27d7 Question #4cf4a Question #83cc2 Could someone please describe the shapes of electron density maps for s and p orbital? And why they're shaped the way they are? If a #300*g# mass of aluminum undergoes cooling from #423*K# to #303*K#, how much heat is loss to the surroundings? Question #b067b Question #cf456 Question #e5d37 Question #d96db Question #590e3 Question #8218d Question #6ae60 What do we mean by a mole of sodium atoms? Question #6bdff Question #b10de Question #bb94d Question #6de97 Question #cc15d Question #d6b09 Question #23d2f What is rate of corrosion (metals) in HCl, seawater and distilled water? What happens when magnesium is left in seawater? Question #0ecfb Question #02614 Why do nitrogen and phosphorus have high ionisation energies? Question #880b3 Question #3f7f7 Question #96fc6 The vapour pressure of a dilute aqueous solution of Glucose is 750mm of mercury at 373K. The mole fraction of solute is? What is the temperature of the gas in Kelvins and Celsius? Question #c8bdf Question #aead9 Write a net ionic equation for the reaction that occurs when barium sulfite (s) and excess hydrochloric acid (aq) are combined. Note: Sulfites follow the same solubility trends as sulfates? Question #49e54 Question #05a06 Question #07f71 Question #6f86f Question #618fc Question #a934a Question #0ffdc Why do some metals corrode whereas, some metals don't? Question #11ada What is differentiating electron? Cobalt sulfate and lead nitrate combine to make lead sulfate. How and why does this happen? Question #b0cd2 Question #7b5f0 How did Rutherford prove the existence of protons? This one cation and two anions each have 18 electrons. (The anions are found in table salt.) Your refrigerator may contain some sour items which have some of this compound. What is the compound’s name and formula? Question #53632 Question #3459e Why does the atomic radius of an element generally decrease across a period and why does it increase down a group? Question #8bd2a Question #5654c Question #52e3f Question #c7965 What is the net ionic equation for the reaction between 2 equiv sodium chloride and 1 equiv lead acetate? Question #57500 Question #15ffd Question #02e27 Question #62475 Why is Mg an ideal atom for F do ionic bonding (don't know how to phrase this right....)? Given the speed of light as 3.0 × 108 m/s, cal- culate the wavelength of the electromagnetic radiation whose frequency is 9.5 × 1012 Hz. Answer in units of m? Question #75122 Question #3a3c9 Question #19a36 Question #9c6ac Question #9cbf3 I did an experiment with a volatile liquid to determine its molecular mass from its vapor density. To better weigh it with less of a vapor pressure error, would it be better to chill flask and condensate in a fridge before weighing it? Question #bf304 Question #02a40 [Co(H2O)6] [Ag(CN)2]3 , what its name according IUPAC? How long would it take a radio wave with a frequency of 7.6 × 105 Hz to travel from Mars to Earth if the distance between the two planets is approximately 8.00 × 107 km? Which of the following is the most likely lattice energy and melting point for potassium iodide? Question #24009 Question #1f73b Question #092cb Could someone please explain to me what does it mean when an atom gets 'excited' and how they reach that state? Question #a52b1 Question #1d1cf How is electron density shared in covalent bonds, if one of the participating elements is strongly electronegative? And what is such a polar bond called? Question #4a2a6 Question #0330e If an #11.9*g# mass of potassium chloride is dissolved in #256*mL# of water, what is the concentration of the solution? Question #d8572 Question #0cc8b Question #ccd24 Question #1db92 Question #8c8f8 Question #285d8 What is #pH# of a solution prepared from #100*cm^3# of #0.51*mol*L^-1# acetic acid, and a #4.1*g# mass of sodium acetate? Question #fc09c Question #91ff1 Question #fdc54 Question #e5c6c Question #4000e Question #18ba8 What is the #"morality"# with respect to aluminum of #0.1*mol*L^-1# #Al_2(SO_4)_3#? What is the difference between barium and bromine? Question #5fc97 Question #d7ae6 The ph scale is a way of comparing...? Question #ea60e Question #c1f61 Question #959f6 Question #f91b2 Question #83ae5 Natural silver (#A_text(r) = 107.868#) consists of two isotopes: silver-107 and silver-109. If the relative abundance of silver-107 (#A_text(r) = 106.905#) is 51.82 %, what is the atomic mass of silver-109? Question #080c4 Question #3d93c Question #8b670 Question #fef97 Question #c1c11 Question #fc220 Question #d0799 Question #11833 Question #0bf2d Question #8b4d7 How do you complete nuclear equations and describe its type of radiation? Question #e4fb4 Question #dde6e Question #4132a Question #d2a99 Question #4de2b Calculate the molarity of the solution prepared by dissolving 9.8 moles of solid NaOH in enough water to make 3.62 L of solution? Question #1ffb8 Question #72546 Question #26cf7 Question #14d0b Question #e38e2 Question #1ae9d Question #ab15c Question #0f1fa Question #c83d3 [Cr (en)2 (H2O) Cl] SO4 .What is its name? Question #07af6 Question #f934f Question #07b5d Question #2ebac Question #d3ffd 1.50 kg of ice (-15ºC) is brought to a water (+37ºC). Specific thermal capacity of ice is 2.09 J/K g and water 4.18 J/K g. Molecular ice melting heat is 6.02 kJ/mol. How to calculate the total amount of heat consumed for the specified change? How do calculate the the following problems? How do you write a balanced nuclear equation for the alpha decay of radioactive isotopes? Question #ef3ba Question #f8d2b How many molecules of water are present in a #1*mL# volume of water under standard conditions? How can you tell if an atom is neutral or not? Question #e13ae Question #7b427 Question #05ef5 Question #f2b1b Question #b5569 Fe(NO3)3 + 3NaCl = FeCl3 +3NaNO3 what is <<---net ionic equation? Question #2d801 Question #d0ea6 Question #e366a Question #c322d Question #de55e Using concepts of effective nuclear charge and shielding electrons, why does the octet rule exist? Question #0b9bd Question #9fcd2 Question #a71d6 Which two of the first thirty-six elements would you expect to from bond with the hreatest ionic character? Write the electronic configuration(s,p) for the ions involved? Can Sodium Benzoate and Citric Acid form Benzene and under what conditions? What is the volume occupied by 3 moles of gas at #"STP"#? Question #8da85 Question #1163d Question #74da7 Question #71354 Question #3d854 Question #3d103 Write the formula for the compound usually formed when the elements of ionic numbers 6 and 16 combine toghether? Question #eedc5 A) name one non metal that exists as single atoms? B) name a non metal that exists as a liquid at ordinary temperatures.? Question #d31be Question #05ce1 Question #a99e9 Question #07a4a Question #abebe What is the mass in grams of #5.3 xx 10^23# molecules of carbon dioxide #(CO_2)#? Is the dissolution of sodium chloride in water an example of chemical change? Question #49e24 Question #8fb6b Question #8b3f6 Question #43205 What is the #/_O-O-O# bond angle in ozone? Question #92235 Question #4a1cb How many moles are there in 20mL of vinegar? A #250*cm^3# volume of phosphoric acid of #1.25*mol*dm^-3# concentration was titrated with a #45*cm^3# volume of conc. ammonia. What was #[NH_3]#? Question #15909 Question #24993 The solubility of manganese(II) sulphate at 20oC is 62.9g/100g H2O. How many grams of manganous(II)sulphate penta-hydrate crystal must be added to 51L H2O to make a saturated solution? Question #45e72 Which hybridization best characterizes the C atom involved in a CH4 molecule? Question #cc5bc Does the nuclear charge increase or decrease as you go across a period (for atomic radii)? What is the wavelength for light of frequency #1xx10^-13*s#? Question #0dd91 Question #3f076 Why is pentane not miscible with water but ethanol and methanol are? Question #ba148 Question #bda16 Question #31ec9 Question #6efa5 Question #d149d Question #d4c76 Question #42444 How many grams of MgCI2 are present in 60.0 mL of a 0.10 M MgCI2 solution? Question #fe4d4 Question #b6f59 Does the electron shielding increase or decrease as you go down a group (for atomic radii)? Question #721c5 Question #56781 Question #f69fb Question #6fc50 What is the mass of a single aluminum atom? When 0.500 g of butyric acid is combusted completely in excess oxygen, and it produces 0.999 g of carbon dioxide and 0.409 g of water, how do you find the empirical formula of butyric acid? Question #57464 The enthalpy change for the reaction between 2 molecules of carbon oxysulfide (COS) to form 1 molecule of CO2 and 1 molecule of CS2 is – 3.2 × 10–24 kJ per molecule of COS. What is the enthalpy change for 1 mole of COS? Question #1d6b4 Question #517aa Question #e3e48 Question #7a03b Question #10ba6 Question #9c42e How many electrons in #P^(3-)#; #Ru^(3+)#; #Cd^(2+)#; #As^(3-)#; #Ag^+#; and #Zr^(4+)#? Question #d7149 Question #58318 What is the reaction between #"potassium hydroxide"# and #"sulfuric acid"#? Question #54630 An automobile airbag inflates when #NaN_3# is converted to #Na# and #N_2# according to the equation, #2 NaN_3 rarr 2 Na + 3 N_2#. What volume (in L) of #N_2# would be produced if #168" g of NaN"_3# completely reacted at S.T.P.? Question #c4d11 Question #7e309 Question #dbf91 Question #f00ae What volume of a 0.357 M hydrochloric acid solution is required to neutralize 22.1 mL of a 0.122 M potassium hydroxide solution? mL hydrochloric acid? Question #e0b0f Question #d737c Question #68906 Question #6de1f Why is CuCl formed from the corrosion reaction of Cu(s) and HCl? Question #eabae How many molecules of oxygen #(O_2)# are required to produce one drop (0.010 g) of water? How to identify strong/weak acid/base ? How many fluorine atoms in a mole of fluorine molecules? Compare and contrast the (1) effective nuclear charge and (2) atomic radius for the following? nitrogen, oxygen, and fluorine What is the Lewis structure of the biphosphate ion? What are the Lewis structures and molecular geometry for carbon monoxide, and ammonia molecules? Question #5238a Balance the chemical equation by using oxidation number method (not by ion electron method) [Cr(OH)4]^- + H2O2 --->CrO4^2- + H2O(Basic medium)? Question #03eca Question #edf7c Question #959a0 Question #cb25b Question #c7df4 Question #bba2f This binary ionic compound consists of a cation and anion that both have 10 electrons. the charge of the anion is -1. You may find products containing this substance in your bathroom at home. What’s is the compounds name and formula? Question #4ac90 Question #48665 Question #efa36 Question #21d78 Question #f0301 Question #549bf Question #918b1 Question #dadc8 Question #cec43 Question #62b04 Question #7a4c6 Question #41f5f Question #1da68 Question #29aac Question #ca22b Question #f9250 Question #e747d Question #260f7 Question #d9f2c Question #70196 Question #9080e Question #c7465 How many molecules are contained in 3.79 mol of chlorine gas #(Cl_2)# ? An unknown amount of gas occupies 80.5 L at 1.93 atm and 298 K. How many moles does the sample contain? What is the mass if the gas is helium? What is the mass if the gas is argon? Mevalonic acid has #%C;H;O-=48.64;8.16;43.2#, what is its empirical formula, and its molecular formula if its molecular mass is #148*g*mol^-1#? Question #4192a Question #bf4f3 How does barium hydroxide react with hydrogen iodide? What is the wavelength, in nm, of a photon emitted during a transition from the n = 5 state to the n = 2 state in the hydrogen atom ? Question #1023b Question #e6ebb Question #39dee Question #3e9ac Question #8d6e0 Question #07384 Question #6882d Question #1d17b Question #023e3 Question #d2a53 Question #e2569 Question #130ab Question #180ac Question #e5fb8 Why are "s" + "p" overlaps directional bonds? A salt is constituted as #M_2(SO_4)_2#. How will its phosphate salt be presented? How does acetic acid dissociate with temperature? What is the chemical equation? Question #35e86 The density (in g/L) of helium (He) gas at 723 torr and 225 K is? Question #f4604 Question #6ec9e Question #d79fb Which element in a group on the periodic table has the largest atomic radius? Question #438c1 Question #6897b Question #61fba Is my Chemistry teacher wrong or right? Question #04a19 Help with chem question? What element, and how would we write, an atom with 9 protons, 10 neutrons and 10 electrons? Question #fb507 What is the frequency of a 1 meter radio wave? Question #b08d7 When calculating mass to moles. How many decimal places should i round it to? Question #19e39 Question #aee36 Question #d1cdd Question #11704 Question #e74c7 Question #dde17 Question #b7ed9 Question #cb65c Consider the reaction when aqueous solutions of lead(II) nitrate and sodium hydroxide are combined? Question #dff07 Question #bedea The pH of a sample of baking soda dissolved in water is 5.74 at 25 degrees celsius. Calculate the pOH, [H^+] and [OH^-] for this sample? A gas-filled balloon with a volume of 2.80 L at 1.20 atm and 20°C is allowed to rise to stratosphere (about 30 km above the surface of the Earth), where the temperature and pressure are −23°C and 3.00 × 10−3 atm, respectively. What is final volume? What occurs when solutions of silver nitrate and sodium chloride are mixed? Question #73679 What do we observe when a solid undergoes a phase transition to give a liquid? Question #b5fbe Question #06ce2 What mass of carbon dioxide gas is present for a #52.0*mL# volume, at a temperature of #303*K#, and a pressure of #0.907*atm#? Question #06181 Question #c7a58 Which of the following statements and reasonings are true? Question #22781 Question #12f36 Question #e3b9d Question #1a32a Question #bef51 Which ion will make a basic solution when dissolved in water? Question #43c30 Question #fbed2 How do you create a science prelab? Given #100*g# EACH of carbon disulfide, and chlorine gas, #0.423*mol# carbon tetrachloride results. What is the percentage yield? Question #17bee In equation 2NO+O2=2NO2 for each (1.0) mole of NO: How many moles of O2 are consumed and of NO2 produced? How many liters of each (state conditions)? How many grams of each? Question #25045 What is axial, equatorial, and planar in VSEPR geometry? Question #b0f03 Question #cc2a9 For the equilibrium reaction...#A+BrightleftharpoonsC+D#... ...initially, #P_A=6*atm, P_B=5*atm, P_C=P_D=0*atm#...and at equilibrium #P_C=P_D=2*atm#...what is #K_"eq"#? A student is given the task to determine if an unknown compound contains ionic or covalent bonds. Which of the following groups of tests would be best able to answer that question? What is the geometric name for H2CO2? Question #b5b5e Question #7fc0b What is the outcome of reaction, of copper in HCl? An aqueous solution of hydrochloric acid is standardized by titration with a 0.144 M solution of barium hydroxide. If 18.7 mL of base are required to neutralize 15.7 mL of the acid, what is the molarity of the hydrochloric acid solution? M hydrochlori How many molecules(not moles) of NH3 are produced from 4.90*10^-4 g of H2? Question #c5c5f Question #78d03 Question #64bf4 Question #972a0 Question #50782 There are three naturally occurring isotopes of the hypothetical element hilarium 39Hi, 40Hi, and 42Hi. 39 is 16.9% 40 is 35.2% and 42 is 47.9%. Calculate the weight of the naturally occurring hilarium. Answer in units of g/mol? Question #bd24d Question #77e42 Question #e790f Question #de924 Question #2ef2f Question #02a25 Question #a74da Question #e4883 Question #721d1 Question #04c52 An aqueous solution of potassium hydroxide is standardized by titration with a 0.122 M solution of hydrochloric acid. If 22.1 mL of base are required to neutralize 27.1 mL of the acid, what is the molarity of the potassium hydroxide solution? Calculate the weight proportion of H2O in Na2S2O2.5H2O? Question #4774f Question #a6cce Question #a6765 Question #6ea92 Question #247dc Question #ea840 At a pressure of #"1 bar"#, and a temperature of #22# #""^@C#, an unknown gas occupies a volume of #3.650*L#. What is the gas? Question #a4479 Question #da03f Question #2313a An aqueous solution of hydrobromic acid is standardized by titration with a 0.187 M solution of calcium hydroxide. If 11.9 mL of base are required to neutralize 12.9 mL of the acid, what is the molarity of the hydrobromic acid solution? Question #3e53d A sample of zinc iodide contains #2.5*g# of metal, and #9.7*g# iodine. On these data, what is the empirical formula of zinc iodide? Question #3edcc Why 3d block transition elements have variable oxidation states??? Question #91fef Samantha wants enough one dollar coins to become a billionaire. How many moles of dollar coins will she need? Question #b25f3 Question #dfbbb Why would magnesium dissolve in water? Which one of the following Lewis structures is definitely incorrect? Question #d3e72 Question #4b3ae Question #90d9b What are atoms of the same element that have different atomic masses? Which of the following energy transitions for electrons will occur when red light (650 nm) is absorbed by an atom? Question #61d66 What happens in the reaction of copper in HCl? How many moles of gas are contained in a #3.00*L# volume of gas at a #300*K#, and a pressure of #750*mm*Hg#? Question #d16ac Question #ed719 Write a net ionic equation for the overall reaction that occurs when aqueous solutions of potassium hydroxide and hydrosulfuric acid are combined? Assume excess base. Specify states such as (aq) or (s). Question #38eb3 Question #af11f Question #75ef7 Question #16c4d A sample of nitrogen gas #N_2# weighs 42.8 g. How many molecules of #N_2# are present in this sample? How many atoms of N do these represent? Question #5c26d What occurs in the corrosion reaction of Magnesium in HCl? The dissolution of ammonium chloride in water is ENDOTHERMIC, and yet ammonium chloride is VERY soluble in water. Why so? Question #6e4ab What happens when Magnesium is left in HCl for corrosion to occur? Question #44a29 Question #a481a Question #c22b4 Question #88e05 Question #f8e18 Question #ce9ff Question #f4fd7 Question #9cc6c Question #b71e0 Question #d5441 Question #fcb4f Question #2824d Question #19191 A hypothetical pure element consists entirely of two isotopes. The natural percent abun- dance of the isotope with mass 25.2 u is 24.2%. The other isotope has mass 30 u. Calculatethe atomic weight of the naturally occurring element? How many elements make up one molecule of carbon dioxide? Question #9117a Question #1326b Question #8d4ab In the laboratory you dilute 5.43 mL of a concentrated 6.00 M hydrobromic acid solution to a total volume of 150 mL. What is the concentration of the dilute solution? M Question #a0219 An ion contains 13 protons, 14 neutrons and 11 electrons. What element is this, and what is the charge on the ion? What happens to acetic acid when heated up? And what's the chemical equation? Question #cdf7a 3) 10 mL of a 0.1 M NaOH solution were titrated against a 0.05 M HCl solution. How much (in mL) of the 0.05 M HCl solution will be required to reach the end-point of the titration? Question #41d62 Question #d32f4 A piston enclosing a #24*L# volume under a #482*mm*Hg# pressure is compressed to #2410*mm*Hg# pressure. What is the new volume? How many grams of oxygen will be produced by decomposing 96gram of potasium chlorate? Thanks Question #1d601 Question #6ba1b What would the balanced reaction between nitrogen and hydrogen (at atmospheric pressure and room temp)? A solution is prepared by adding 0.040 moles of HCl to 100 mL of a 0.50 M ammonia solution. Ka(NH4+) = 5.6 x 10-10. Assuming no volume change upon addition of the HCl, what is the resulting pH? What is the relationship between wavelength, frequency, and energy of a photon? What is the pH of a 0.150 M solution of sodium acetate (NaO2CCH3)? Ka(CH3CO2H) = 1.8 x 10-5. Question #8e8ea How do #Zn# and #Cu^(2+)# engage in a redox reaction? Question #9807a Question #3a21f Question #ad858 How many neutrons present in the #""^80Br# isotope? Question #b2d3f Question #6b4e1 255 ml of 0.711 M HCl is mixed with 432 ml of 0.245 M HCl is mixed with 432 ml of 0.245 M Sr(OH)2. Is the solution acid, basic, neutral? if the solution is not neutral, how much of the excess reagent is leftover? What is the Molarity of the excess ? When magnesium oxidizes it utilizes 48 g of magnesium for every 32 g of diatomic oxygen to produce magnesium oxide. See below for questions? Question #95ee0 Question #8f19d Question #ec81b Assuming ideal gas behavior, what is the density of sulfur dioxide at 750 mmHg and 20 degrees Celsius? Question #053c1 Question #9a1b9 How do you represent the reaction between #"barium hydroxide"#, and #"hydroiodic acid"# as a stoichiometric equation? Question #3c818 Question #ac941 Question #06601 Question #fcab2 Question #405c9 Question #c40e2 Question #44ec4 Question #c39c4 In which direction does the reaction proceed to reach equilibrium? The reaction will proceed from right to left to reach equilibrium. The reaction will proceed from left to right to reach equilibrium. Given the thermochemical equation Al2O3(s) Õ 2Al(s) + (3/2)O2(g) ΔHº = 1676 kJ/mol what is ΔHº for the reaction? 4Al(s) + 3O2(g) Õ 2Al2O3(s) Question #c8f5c Question #aa4ad Question #1765c Question #02e38 What is the molarity of the oxalic acid (H2C2O4) solution that required 18.29 mL of a 1.75 x10–2 M aqueous solution of NaOH to completely neutralize a 20.00 mL sample of H2C2O4? Question #a797d Question #9ea33 Question #99614 Question #56eea Question #a15e3 Question #3f70e Question #67f18 Question #b8a58 Question #aba4f Blackboard chalk is a mixture of limestone and gypsum.A piece of blackboard chalk weighing 5.42g was immersed in HCl,the CO2 produced weighed 1.11g.What is the percentage of limestone in the chalk?Thank you When 1.64 g sample of an unknown hydrocarbon was completely burned in oxygen, it produced 2.36 g of H2O. What is the percentage by mass of carbon in this hydrocarbon? Question #47024 Question #faca5 Question #9ce6d A 1.215 g sample of an unknown acid of the form HX is dissolved in 100ml solution and is neutralized by using 75ml of a .200 M of NaOH solution. Calculate the formula mass of the acid HX. What is X? Question #27578 What is the method (pH meter or natural indicator) to measure the pH of Coca-Cola? Clearly explain your choice? Question #4d06d Did the predicted [H+] for the solutions and the actual [H+] calculated from pH you determined with the pH meter match? If you answer is no, give possible experimental errors that could change these values? Question #62204 Question #f1e64 Question #a721f Question #666de Which will have the lowest percent ionic character based on your knowledge of electronegativities? BaO or SrO? Question #4e0ef Question #f090f What is the mass of #9.06xx10^23# #"sodium atoms"#? Why did you mix 5 mL of HCL and 5 mL of NaOH to make a pH 7 solution? Explain your answer using proper equations? Question #ce5bf Can someone explain the anticlockwise rule for electrode potentials? Question #f4180 Question #d1479 Question #13cbe What are smelling salts? Question #5c6a4 Question #142a9 How do we treat sulfuric acid in acid-base calculations? Question #8d3b9 Question #a4ba2 Question #c41fc Question #cb12f How do I write this as an equation? Question #13e9e Question #a64de Question #b0066 In an isotope, what determines the number? Driving 1000 miles a month is not unusual for a short-distance commuter. If your vehicle gets 19.70 mpg, you would use approximately 50.76 gallons of gasoline every month. If gasoline is approximated as C8H18 (density = 0.703 g/mL)...? Question #1386e Question #ed6cc Why is it necessary to clean the nichrome wire in between metal ions? Question #73df0 Question #e07d4 Question #011cf Question #a12a9 Question #123bd The de - Broglie wavelength of a proton accelerated by #400 V# is ?? Question #a89b5 Question #c01f9 Question #8bb5b Question #32232 Question #3ee16 Question #f1e48 Question #60664 How many subatomic particles does a silver atom possess? Question #55fee When #0.121" moles of HCl"# reacts with #0.399" moles of NH"_3#, how much #"NH"_3# is consumed? Question #f0441 Question #bee7d What is the structure of #XeF_2#? 40g of NaOH is added to water to create 1 L of solution. The resulting solution has a SG of 1.07. a) Calculate the mass (in lb) of 1 L of solution? b) Calculate the molecular mass of NaOH? c) Calculate the molarity of NaOH in the solution.? Question #45b7f A solution of Rocephin 285mg/mL does not freeze.what can be the explanation? Question #1d27b Arrange the size of Na, Na+ ,Cl,Cl- in increasing order? Question #80842 Question #d9855 Question #f84c2 Question #0bb4d Question #04061 What is the role of dielectric constant for sparingly soluble salt?? Question #c302a Question #a02de Question #aeef4 Why does the oxidation number of sodium change when it is reacted with fluorine? How does the size of the ions compare to those of the neutral elements? Question #332b0 100ml of 0.5N NaOH solution is added to 10ml of 3N H2SO4 solution and 20ml of 1N HCl solution.The nature of the mixture is ? Question #14c22 Question #32c99 Question #d71b2 Question #dc9df Question #46919 Question #44d26 Question #ad2d9 Question #c2b33 Question #ca3fa A 3.15 gram sample of an unknown gas is found to occupy a volume of 2.22 L at a pressure of 519 mmHg and a temperature of 34°C. Assume ideal behavior. The molecular weight of the unknown gas is? Question #1b22b The de - Broglie wavelength of a neutron at #27^@C# is #lambda#. What will be its wavelength at #927^@C# ?? Question #08f26 What is the concentration of #"sulfate"# in a solution made from #20.7*g# #"ammonium sulfate"# in a volume of #125*mL#? What's the difference between electron geometry and molecular geometry? Question #4338c Question #149e9 Question #a6ed3 Question #50cc6 Definition of Quantum Number?? Thank you. What type of intermolecular force of attraction is present in the given pair of molecules, #NaCl - H_2O# ? What volume of #"0.200 M"# #"HCl"# should be mixed with #"0.300 M"# #"Na"_2"CO"_3# to achieve a #"pH"# of #9.45# in a #"1-L"# solution? Calculate the change in freezing point for ice if the pressure changes from #"1 atm"# to #"3 atm"#? Question #d5d1d Question #92c3a Question #46eb6 Question #20b37 Question #0f014 Question #10183 Question #f5c4d Question #e0bf6 Question #0f763 Question #34616 A sample of #CO_2# is collected in a test tube by displacement of water. If the total pressure in the test tube is 100.6 kPa, and the vapour pressure of water is 2.98 kPa at the temperature of the sample, what is the partial pressure of the #CO_2#? Question #cfa69 Question #e0a62 Which type of intermolecular force of attraction is present in #CH_4-C_6H_6# and #NH_3-H_2O#? Question #a9add Which type of intermolecular force of attraction is present in the given pair of molecules, #CH_4 - C_6H_6# and #NH_3 - H_2O# ? Question #2e965 Question #00419 Question #f3d5d Question #e1a36 Which of the following electron configurations most likely represents an atom that will form an anion? Why Ncl5 is an unlikely structure?!?! Question #7d36a Explain how ground water becomes hard water. Your answer must include balanced equations for any reactions mentioned? Question #ef78d Question #2a9cd Question #2ed87 Question #d3bf8 Question #6703e Question #b75fa Question #0e55d Question #2c26e Question #8c2dd Question #427fd Question #27b00 Question #f1896 Question #da4a9 Question #29730 Question #dd1be Question #c36ae Provide one set of acceptable quantum numbers for each of the valence electrons in sulfur? What is the total amount of energy required to remove both electrons from an atom of helium, in kcal per mol? Question #25ba6 An atom absorbs energy at a frequency of 2.0 x 1016 Hz. Which of the following is consistent with that information? Question #19e3e Question #10671 Question #3bb12 Which of the following 0.1 mol l-1 aqueous solutions has the highest pH value? Question #20eee Question #374dc How do we calculate the change in pH of a buffer solution upon addition of NaOH? Question #6a8dc Question #35744 Why Nacl5 is an unlikely structure?!?! Question #963a9 Question #da3f8 Question #1013b Question #4cfe7 In really simple/child-like terms, with some sophistication can someone explain orbital hybridizations and what the point of it is? Question #5a8fb How many compounds does neon make? One of the students discovered that when he filled test tube G with solution G (ALCL3), the contents of the test tube immediately became a milky gel. What type of contaminant was present in this tube when he added solution G? Question #268e2 Question #22cff Question #76b87 Question #1c19f Question #b699a How would you turn a gas state of something into its plasma state? More specifically: How would you go about turning the gas state of something like methanol, isopropyl alcohol, or ethanol into its plasma state? Thanks. Question #79293 Question #fcaef Question #e12b3 Question #da40d Question #76a6c Question #f479f Question #a1ded Which type of intermolecular force of attraction is present in the given pair of molecules, #I_2-I_2# and HCl-HCl? Question #5abd0 Question #ca722 Question #2f3c8 Question #62563 Question #bdf81 Question #64127 How to calculate the pH of the buffer system 0.15M NH3 / 0.35 M NH4C ? Question #6bcde Question #2d0ea Question #2afcb Question #589fd How do I balance the equation for the oxidation of diphenylcarbazide by Cr to give diphenylcarbazone and Cr³? Question #9f742 Question #af1cb Bond angle help? Question #14352 Question #3ddd3 Question #fba7b Question #4a756 Why did we use HCL instead of other acids? Why does #C Cl_3^-# have a minus charge although Carbon needs one more electron to get Its Octet completed? Question #a070e Question #db875 Question #2c183 Question #73b96 Question #b7ec3 How decrease concentration NaF in H2O using MgCl2 or MgOH? thanks Question #695e1 Question #093b8 Question #dac32 Question #b0e14 Question #073d9 Question #61c84 Question #31f1f Question #5b12c Question #efa75 Question #550de Question #c6f31 Question #af20f Question #b4cce What is the atomic number of an atom whose nucleus has an overall positive charge of #4 * 10^(-18)# #"C"# ? Question #e7d14 Question #fe129 Question #112dd Question #a0a0a Question #2706d What causes gas pressure (in terms of kinetic theory)? What volume of #10^(-3)M# HCl should be added to 1000 ml. of #10^(-3)M# NaOH, so that #pH# is reduced by 1 unit? Thank you:) Question #43087 Question #9885a Question #f70c7 Is But-2-ene a 3D or 2D structure in overall? The volume of water added to 500ml,0.5M NaOH solution so that its strength becomes 10mg NaOH per ml? Question #b0422 A 0.281 g piece of solid magnesium reacts with gaseous oxygen from the atmosphere to form solid magnesium oxide. In the laboratory a student weighs the mass of the magnesium oxide collected from this reaction as 0.254g. What is the percent yield of this? Can some one please explain accuracy and precision and when to use them also significant figures? (with examples would be amazing ) How would your results for this experiment have been affected if you had removed the crucible from the Bunsen burner too soon? Question #236d9 Question #3ea0b Question #00e53 Question #23edc Question #29ceb If 0.250 g of a gas sample represents 1.05x10–2 mol, what is the molar mass of the gas? Question #3326d Question #3d2e3 What will happen if I mix copper(II) sulfate and sodium carbonate? If small non-polar molecules were mixed with water, would it dissolve or not? Question #74c81 Question #3b818 Question #37b92 Question #36052 Question #27e55 Question #0711d Question #64d8c Question #9386f Question #62885 Question #bc2e5 The relative molecular weight of acetic acid is 60.05 and its density is 1.049g/ml. Describe how you would prepare 1L of 2M solution of acetic acid? Question #82d4e Question #efa64 How many grams of titanium could be obtained from a 27.00 mole sample of Ti6Al4V? Question #46cd0 Question #1df2c How many grams of CO2 would be needed to have the same number of moles of CO2 as there are in 52.2 grams of H2O? Question #eaefd Question #10243 What is the largest monoatomic anion? Is it #"Bi"^(3-)#? Question #cd4c5 Question #34481 Question #7eb58 Question #3dc10 Question #2484a Question #bea35 Question #fc445 10 g sample of a mixture of CaCl2 and NaCl is treated to precipitate all the calcium as CaCO3. this CaCO3 is heated to convert all the Ca to CaO and final mass of CaO is 1.68g the mass % of CaCl2 in original mixture is ? Question #b3724 Question #2f22f Question #2b013 Question #2976a Question #d2e4f Question #29b50 How I calculate mass fraction ratio? Question #290c4 Question #fb9e2 Chemistry question? Question #ec44e Question #39d3b Question #049d8 Question #11081 Question #2b53f Question #e461c Question #b1223 Question #ceebc Question #5ad3c Question #5cd6c What is bond order of C in HCN ? Question #a3629 Question #e93a1 What is the concentration of sodium hydroxide in #mol*L^-1# of a solution that is #40*"ppm"# with respect to that solute? #K_a# for #HCN# is #5xx10^(-10)# at a certain temperature. For maintaining a constant #pH# of #9#, what is the volume of #5M KCN# solution required to be added to #10#ml. of #2M HCN#? Question #4a86a If #"H"_2# and #"He"# are at #"1 atm"# and #"2 atm"# respectively, find the ratio of speeds for #"H"_2# vs. #"He"#? Question #68813 Question #81588 Question #0cf4d Question #de4c3 Question #d5eb8 Calculate the weight of the specific element: Barium in 5 mmol of barium sulphate (BaSO^4)? Calculate the pH of a buffer solution which contains 7.20g of sodium benzoate, C6H5COONa, dissolved in one litre of 0.02 mol/l benzoic acid? Question #7e4fd Calculate the mass of Ca(NO3)2 needed to prepare 3.5 L of a 0.8 M solution? Question #2a18a Question #9b49b In a #0.698*mol# quantity of sodium carbonate, what is the mass of material? Question #a04ca Question #0b5b2 Question #f28ef Question #a22c4 Question #305e7 Question #6035c Question #01547 Question #7001d What are the reducing agent and the oxidising agent in the chemical equation below? CH4 + Cl2 = CH3Cl + HCl What is the electronic configuration of #""^54Cr# isotope? How do we use or apply oxidation numbers in real life? Like what do we get to know about the element and how would it react if we know its oxidation number? Can someone clarify this to me? thanks! :] 300 cm3 of 0.1 mol l^-1 of potassium hydroxide is added to 125 cm3 of 0.05mol l^-1 of hydrochloric acid. Calculate the pH of the resulting solution? What is the noble gas notation for indium? (chemistry) Question #f824a If you are given the molecular weight of a substance to be 60 grams, and you know the empirical formula is #CH_2O#, how do you determine the molecular formula? What is the molarity of a solution composed of #5.00*g# sodium sulfate dissolved in #125*mL# of solution? What is the mass of #4.726xx10^22# #C_2H_5# molecules? Question #b48bd Question #35375 Question #25af4 Question #863a9 Question #51815 Question #613c2 Question #6acef Question #c3379 Question #f26e1 Question #5d060 Question #edf76 What is the atomic mass of strontium, the which contains the following isotopes: #""^86Sr (9.86%); ""^87Sr(7.0%);""^88Sr(82.58%)#? Can you put a higher reaction coefficient when balancing equations? What is density of an object that has a mass of #10.76*g#, and a volume of #15*mL#? Question #641fd Question #24694 What volume (in mL) of 9.91 M sodium chloride is required to produce 100.0 mL of a 0.398M solution? Question #85f11 Question #ebf2a Calculate the pH of a buffer made by dissolving 6.00g of ethanoic acid, CH3COOH, and 4.10g of sodium ethanoate, CH3COONa, in aqueous solution? (pKa of ethanoic acid = 4.76) I'm doing a lab where I am supposed to calculate the "molarity of water" in pure water at 30 degrees Celsius. With the hint that the density of water at 30 degrees Celsius is 0.9957 g/mL. What is the molarity? What's the molar concentration of a sulfuric acid solution, 35.00mL of which neutralizes 25.00 mL of 0.320 M NaOH. (Careful! Sulfuric acid is diprotic) What's the molar concentration of the sulfuric acid solution? Question #bf7e9 Question #74b68 Question #17fa8 Question #f6c34 Question #97e89 Question #a3d03 Question #11bdf Question #65598 Question #d73a1 Question #a0d91 Question #68f93 Question #30e0d Question #6c394 Question #98c40 Question #d317f Question #9c8f8 Question #70c66 Question #37b91 Question #f33e6 Question #36be5 In a #2*mol# quantity of water, what is the mass of hydrogen? Question #7b6e2 Question #86f3b Question #e46ed Question #9a027 Question #b7957 Question #e60db Question #6fcf2 Question #ff4e9 Question #7c0b5 Question #d6edd Question #69805 Question #2eb39 Question #2028e Question #a9b5d Question #cc203 Question #6025f Question #3beb5 A piston full of gas at #1*atm# pressure, and a volume of #3.50*L# is compressed at constant temperature. What is the new pressure? Question #5b70d How do we achieve a #pH=13# given #100*mL# of water and WHAT mass of sodium hydroxide? Question #b1203 Question #edb36 Question #a9503 What is the volume of an acquarium whose dimensions are #76.7*cmxx144.5*cmxx104.2*cm#? Question #bdf96 The bullet density 5.40g/cm^3 , and mass it 80g , fall down in cylinder capacity it 100ml and contains 50ml from water , what the height that can water arrive it in cylinder ? Question #d7695 Question #56e8c Question #63163 Question #1de1f Question #bc444 Question #c1ad1 The molecular weight of magnesium hydroxide is 58.33. Describe how you would prepare 1000ml of 0.1N solution of magnesium hydroxide? Question #4b468 Question #97b52 Question #17191 Question #9b2fc Why does beryllium chloride form a hydrate of formula #BeCl_2*2H_2O#, whereas magnesium chloride forms a hydrate of formula #MgCl_2*4H_2O#? Question #10524 Question #cfcf1 Question #15c2c Question #e2b05 Question #5bbe3 Question #cbe36 Question #e8ef9 Are masses of #0.24*g# #Mg# metal and #0.64*g# #O_2# gas stoichiometric with respect to the formation of #MgO#? Question #92aa1 How can one balance the following redox reaction in basic medium? What is the total volume of gas produced from the decomposition of #100cm^3# of #0.2 mol#/#dm^3# hydrogen peroxide(#H_2 O_2#)? Question #9f696 Question #8510a How to calculate oxidation number of Iron in ferriferrocyanide Fe4[Fe(CN)6]3 ? Question #f58a8 Question #55f23 Question #3c3bd Question #44caa For each solution, what are the ions that exist in aqueous solution? Specify the concentration of each. Question #94c52 Question #c351a Question #396f4 Question #8ceed When must parentheses be used in chemical formulas? Question #d3aeb What elemnt is in period 2 and fform-1 ions? Question #ed7de Question #db2ce In the equation, #2Al + 2Fe^(3+) + 3O^(2-) -> 2Fe + 2Al^(3+) + 3O^(2-)#m which element has been oxidized? Question #96af2 Question #50513 The #pH# of 0.05M aqueous solution of diethylamine is 12. What will be it's #K_b#? Thank you:) Question #4b1ff Question #1ccfb To what volume should a #100*mL# volume of #10.0*mol*L^-1# solution be diluted to make a #0.5*mol*L^-1# concentration? Question #67a71 Question #def58 Question #0a5b6 A solution is prepared by mixing 16ml. of 2.5M #HCl# and 40ml. of 2M #NH_4OH#. What will be the #pH# of the solution if #pK_b# is 4.75? Thank you:) Question #54a51 Question #aa2a8 Is H2SO4 covalent or ionic compound? Please I need your answer in concisely Question #0f965 Question #e6ed5 Question #14583 Question #f334d Given a cylinder of #8.5*L# volume that contains helium at a pressure of #189.4*atm# at a temperature of #298*K#, how many balloons could be filled enclosing a volume of #2.2*L#, and have a pressure of #1*atm#? Question #36f26 Question #d7321 What is the volume in #m^3# of a container whose dimensions are #115*cmxx77*cmxx73*cm#? How does hydrogen peroxide disproportionate? Question #c7547 Why are the electronic configurations of ATOMIC chromium, and copper unusual? Question #72e1a Question #14490 Question #eacbf How to solve half life problem? Question #47527 Question #04c57 Question #85806 Question #d48b6 Question #eaa3a What are 3 sources of error that would account for differences in measurement of the same thing? Question #f81b5 Question #e3541 Question #60393 Question #0205d Question #14ed8 Question #177d8 Question #f3858 Question #c7e95 Question #72045 Question #b9584 Question #4df23 Question #f63d1 How many electrons are present in a single #NO_3^-# ion? Plot the density on the vertical axis and the mass % ethylene glycol on the horizontal axis and determine the % ethylene glycol content of an ethylene glycol-water mixture that has a density of 1.030 g/mL. Could you post a picture of the chart? Question #79122 Question #a165a Question #26cc9 Question #ff19f Question #ba5d6 #XCl_3# contains 67.2% chlorine by mass. Calculate the molar mass of X and identity the element. ? Question #0fab5 Question #65c07 How does #pH# evolve as the concentration of #H^+# increases? Question #b9416 Question #ab7f5 Question #ab4af Question #a8585 An hydrocarbon is 80% carbon by mass. What is its empirical formula? Why was Rutherford wrong ? Question #a8713 What is the relationship between #"vapour pressure"# and #"boiling point"#? In 1 ltr. saturated solution of #AgCl(K_"sp"=1.6xx10^(-10))#, #0.1# mol of #CuCl(K_"sp"=1.0xx10^(-6))# is added. What is the resultant concentration of #Ag^+# in the solution in molarity? Question #f0c2b Question #d04fe Question #1683b Question #13dca Describe how you prepare 1L of 0.50M solution of sulphuric acid from 5.0M solution of sulphuric acid? Question #5fed7 What is the theoretical percent water in the hydrate MgSO47H2O? Question #93682 Question #b2c2f Elements in the same group in the periodic table exhibits same oxidation state. Is this statement true? One litre of water contains #0.121*mol# of gold metal. How many atoms of gold are present? How much hydrogen sulfide is required to precipitate a #15*g# mass of #"lead sulfide"# from excess #"lead nitrate"#? Question #64134 What is carbonic acid? Question #32d25 Rank the following compounds in order of increasing pH (1 - lowest, to 5 - highest) and label each compound as strong acid, weak acid, neutral, weak base or strong base? potassium hydroxide methylamine hydrobromic acid potassium iodide ascorbic acid Question #a1a19 Question #bba19 Question #8b4c4 What volume of #0.179# #M# #NaOH# solution contains #25.0# #g# of #NaOH#? Question #7e38a What is type 1 or 2 for #Na_2O#? Question #78e95 Question #74192 How does dichromate ion oxidize ethyl alcohol? Write a stepwise mechanism that shows how a small amount of CH3CH3 could form during the bromination of CH4? Question #6ddd3 Question #93f3b Question #d1a70 How many neutrons in the #""^14C# isotope? An equilibrium mixture of 2 moles each of #PCl_5#, #PCl_3# and #Cl_2# in V ltrs. in T temp. has a total pressure of 3 atm. #Cl_2# is added at the same temp. and pressure till the volume is doubled. What is the number of moles of #Cl_2# added? Thank you:) Question #b36b0 Question #395d8 Question #5e6f2 Question #79d91 Question #b3e69 Question #eb64e Question #8d8b0 Why H2SO4 is called Oil of Vitrol? Question #dbbcb Question #2fc44 Question #f93c1 Question #e818a Question #f36ed How many oxygen atoms in an #8*g# mass of ozone? Question #08946 Question #7ef7b How many moles of calcium carbonate are consumed in this reaction? Question #35341 Question #4fdd1 Question #32974 Question #21b1c Question #6f564 Question #d4402 Question #d10dd Question #b510c Question #fdb35 Question #bf32d Question #f374a Question #6ed38 Question #191c4 Question #ae0d6 Question #f5221 Question #22abe Question #6be26 Question #34794 Electromagnetic radiation of 2.97 X 10 22 Hz is applied on the metal surface and caused electron emission. Determine the work function of metal If the maximum kinetic energy of emitted eletron is 1.17 x 10 -13 J .?? Please solve , thanks a lot Question #3ad51 Question #1b2b3 How many chloride ions in a #110*mL# volume of a #0.55*mol*L^-1# solution of sodium chloride? Question #06e6c Titration problem? How to determine the temperature change for dissolving #"10.0 g"# of #"KClO"_4(s)# into water? Cork has a relative density of 0.25. What is the the volume in cubic centimeters of 50g of cork ? Take the density to be 1000 kg/m^3. If I am to write the quantum numbers for the highest energy electron in Cr, or any of the transition elements in its respective row, would n=3, l=2? Molarity problem? Question #7f0b3 Question #0b869 Question #cb3c9 Question #243d0 Question #c9324 Question #54366 Question #53615 Question #1913b Question #b14c0 Question #be84a The density of aluminium is 2700kg/m^-3.calculate the mass of a block of aluminium which has a volume of 100cm3? What is the pressure of the acetylene collected in the Erlenmeyer flask? Question #38d75 Question #6d12a Question #b8534 Question #f7924 Question #3ee3e Question #7980f What are the indicators (litimus ,mythly orange ) acids ,base or neutral ? If a #4*mL# volume of a #0.62*g*mL^-1# solution of barium chloride were added to excess sulfuric acid, how much barium sulfate would precipitate? Please explain simply how we say nitric acid works as an oxidizing agent?? How. Thanks a lot. Question #5902a Question #1b309 What is (i) the molar mass of #"lead nitrate"#, and (ii), the molar quantity of a #42.65*g# mass of this material? Question #e528f Question #67df9 Question #fc0a9 Question #f19d1 Question #88183 Why 1 part by volume of air and 8 part by volume are taken in converter to convert ammonia into nitric oxide in the first step for the manufacturing of nitiric acid by Ostwald process?? Thank you. Question #19302 Question #b46c3 Question #b5e9b Ascorbic acid (C6H8O6) has how many acidic protons that it will lose when reacting with NaOH? Question #8c6bb What is the maximum mass of #"TiCl"_4# that can be obtained from 60.5 g #"TiO"_2#, 59.9 g #"Cl"_2# and excess carbon? Question #1bd66 Although the value of second ionisation potential of alkaline earth metals is higher than that of 1st ionisation potential yet these metals form #M^"+2"# ions but no #M^+# ion? Question #b4a2c A little confusion; How do you represent hydrolysis in a chemical equation?: by writing H2O or H3O+ Question #c056e When concentrated sulfuric is added to water, which solute species expresses the highest concentration? When are the bonds of ions both covalent and ionic? Question #7cf55 Question #0f255 Could I find the mass of #"8000 chlorine atoms"#? Does this mean that 2 moles of CO2 = 88g. 1 mole = C (12g) + 2 O (32g) = 44g 2 mole = 44g x 2 = 88g? Question #d4b07 Question #eae4e Question #9e3ff Question #c216c Question #c481f Question #60e47 Question #4c9c9 How many nuclear particles occur in the hydrogen nucleus? Question #4e73d A technician is given a gas sample to identify. she performs a series of test and complies her results as follows. a) study the results in the table of this page. which tests can be used to identify the gas? B) what is the gas in the sample? Question #4e91e Question #dd1ef Calculate no. Of photons emitted by a 60 watt light bulb in 10 h if a bulb emitted least 6.62 A°? Why is the helium atom smaller than the hydrogen atom? Why is the hydride anion, #H^-#, LARGER than both atoms? Question #8cd2f Question #cbc8f Question #fb14a Question #2b71c Question #c9727 Question #d8bec Question #64162 Question #69b89 Question #92e88 What is the mass of a mole of sucrose (C12H22O11)? Question #4d72c Question #cad5f Question #ae434 Question #2804b Question #48b2d Question #92755 Question #80997 You are given a test tube containing 5ml of solution with 5.5x10^4 cell/ml and you are required to produce a solution that contains approximately 50 cell/ml. What dilution must be performed to obtain the required concentration? Question #ff251 Question #7af23 Question #74ccc Question #d0697 Question #10476 Question #227c1 Question #cd179 Question #9d504 Why is #F_2, Cl_2# gaseous room temperature while #I_2# is a solid? Please give an answer relating to bond strength. What is a 20-sided Platonic solid? Question #20545 Question #b322b Question #1b6e5 Question #a12ca Question #aace6 Question #a4495 Question #ef9c6 Question #fcc6f Question #59b84 Question #8d8cd Question #4e279 Question #d6fe3 Question #f8fc3 What is the #"molarity"# of a sulfuric acid solution whose mass is #250*g#, and whose percentage concentration #"m/m"-=96%#; #rho_"this solution"=1.84*g*mL^-1#? Question #63d58 How to write the name of Hau3+ ion using stock notation. For example HAuCl4 is written as.......(lll) chroride. Fill the blank space? Question #45283 Question #5ebfc Question #a661e Question #9f527 Question #9e7aa Question #55e0e Question #54670 Question #59c05 Question #7cf30 Question #147e5 Question #ef37d Question #f7512 Question #5ca1d Question #732fa Question #c970e Question #9f748 Question #8f51c Question #dcd5c Question #4b390 Question #d3bab Question #1a148 Question #1408e Question #9c974 Question #db470 Question #8b222 Question #06d57 Question #6af83 Question #c8f87 Question #cf259 Question #6e2a4 Question #9064d Question #10db5 Question #0af92 Question #add96 What is the empirical formula of a #0.373*g# mass of iron oxide that contains a #0.261*g# mass of metal? Question #f77d2 Question #714e9 Question #1e9a0 How does the #"electron affinity"# evolve across the Periodic Table? Question #6578b Question #6e5d3 What would a six coordinate metal-ligand complex structure look like? How do you write the net ionic equation for the complete molecular equation? 3 BaCl2 (aq) + 2 (NH4)3PO4 (aq) --> Ba3(PO4)2 (s) + 6 NH4Cl (aq) ______(aq) + ______(aq) --> _______(s) Symbol of positive spectator ion: Symbol of negative spectator ion: Question #5c0dc What volume would #"1 ton"# of chlorine gas occupy under standard conditions? Question #526f5 What intermolecular forces exist in #"napthalene"#? Question #0666b Question #fc913 How many times would the dust particles encircle the planet? based on the mole concept Question #b642e Question #51272 Question #4cb42 What is the minimum mass of oxygen, in grams, needed to burn 16.4 g #"C"_4"H"_12"O"#? Question #a38b9 Why is #AlF_3# ionic while #AlCl_3# covalent compound? Question #a1dc8 Question #12702 Question #a050e Question #ba220 Question #4bbbd Question #46beb Question #5492a Question #8e44c Question #7f8c9 Question #fe75b Question #73238 Question #bc0ae Question #ccd60 Question #341d7 Question #3cd33 Can lead become isoelectronic with xenon? How many electrons would it have to lose? Question #16d7a How is the atomic mass of an element related to its nucleon number and its isotopes? Question #a354c Question #ef004 Question #cc683 Question #97eaa Question #47e74 Question #78651 For a given isotope, how do we get the number of neutrons? Question #bd34c Question #9f125 Question #c5014 Question #a81a4 Question #3af34 Question #c4ed1 Which atom has the largest radius: oxygen; potassium; magnesium; sodium? Question #656e6 Question #e8469 Question #bed84 Question #2f4e7 Why do voltaic cells with magnesium as the annode have such high percent differences? Question #64c77 HCl is a polar molecule, how come the intermolecular forces among its molecules consist of London dispersion force besides dipole dipole attraction ? Thank for answering. The position of uncertainty of an electron is 1.89 x 10 -14 m/ What is the uncertainity of velocity? thank you so much. The work function of thallium is 6.82 X 10 -19 J. What is the maximum frequency of photon that will eject an electron from thallium metal? Question #f80e4 Question #d7571 Question #57909 Why Al does not react with HNO3? Thank you. Question #b5049 Question #f1bc0 Question #7e510 Question #ebfea Question #6ffd9 Question #5189b Question #d0e48 Question #7a5ef Question #9da41 H2S is acidic while water is neutral why? Given the following scenario, what were the original masses of sodium chloride, and potassium chlorides? Question #4a511 How is stoichiometry related to enthalpy changes? Question #819fa What is the size of water compared to ethanol? Why melting point of alkali metals are low as compared to alkaline earth metals? Question #60baf When #1*g# of ice forms, #333*J# of energy are released. How much energy is released when a #55*kg# mass of ice forms? Doesn't suction pump blow out organic compound too, during the process of vacuum distillation? Question #448b4 What is the density of a solution of sodium acetate? How do we use chemical properties to identify a particular substance? A #1*g# mass of ethanol was combusted, and the heat evolved was used to heat a #1*g# mass of water...what is the final temperature of the water? Question #df49d Question #ae272 Question #d02e5 what are the probable concentration of the control solution ? Question #52912 A piece of metal has a density of 11.3 g/cm^3 and a volume of 6.7 cm^3 what is the mass of the piece of metal? Question #75aa2 Question #207d8 Question #39e71 Question #26fd6 Question #9ea0e Which acid contains multiply bound carbon and nitrogen atoms? Question #69645 Question #adaf7 Question #0c801 Question #d865e Question #1c4c8 Question #146ea Why is pressure always negative in the formula #w = -P DeltaV#? What’s the difference between a p-orbital of the second shell and a p-orbital of the third shell? Thank you! Question #ee578 How does permanganate ion oxidize iodide ion under basic conditions? Question #00553 Question #1825c How many chemical bonds are in KNO3? What are their names? Question #275c2 Question #45d16 Question #fbf98 Question #b4265 Question #791f5 If one atom of iron has atomic weight of 56 and atomic number of 26.how many protons and electrons does it have? Question #c4fa3 Question #ed00a Question #86572 Question #13e75 Question #71479 Question #2a47f Question #94cae Why can we not ionize helium? Question #a79c9 Question #81801 What are the 3 physical properties of Barium Chloride? Question #ff911 Question #6d927 Question #ea4f3 Question #fbdbf Question #d62b0 Question #c0735 Question #f0ff4 Question #8c2ad Question #7b7ad Question #ace42 What mass of sodium nitride is required to produce 14.5g of nitrogen? 2Na3N Õ N2 + 6Na What are the criteria for determining the physical properties of an organic compound? Question #a316c What is the volume in LITRES occupied by 50 cubes each with an individual volume of #1.36*cm^3#? Can you represent the reaction of #"potassium chlorate"#, #KClO_3#, to give #"potassium perchlorate"#, #KClO_4#? Question #36993 Question #63ddf What is the relationship between volume and temperature of a gas? Question #9f535 How many liter of H2s (H20) are in e a c h and every gallon of water ? Thank you. Question #41715 Question #14c05 Question #598b6 What mass of iron(III) oxide is required to produce 12.8g of iron? 2Fe2O3 + 3C Õ 4Fe + 3CO2 Question #831fb Question #2d7e4 Question #cddf5 Which is the most polar bond: a. #H-F#; b. #H-CH_3#; c. #H-NH_2#; d. #H-OH#? #100 ml# of #H_2SO_4 #solution having molarity #1 M# and density #"1.5 g/ml"# is mixed with #400 ml# of water. Calculate final molarity of #H_2SO_4# solution, if final density is #"1.25 g/ml"#? Question #3b0fd There is only one reason that an atom will join, or bond together with other atom. What is it? Question #838fa How do you separate a homogeneous sugar solution? Question #3e945 Question #8cd0c Question #4a7ce Question #4a6eb Question #fbb35 What occurs when water is added to concentrated acid? Question #7ce77 Question #107e0 Question #11f57 What is a binary chemical compound? Question #d1d46 Question #2ec18 Question #b9540 Question #53964 Question #dfa07 Question #09d14 Question #5a60f Question #4e0d1 What is the difference between donation and transfer of electrons? Question #4bd54 Question #f4cfe Question #44aa5 Question #f7503 Question #1dd24 Question #cdad7 Question #f11ce Question #17e74 Question #0ce80 Question #9111c The rate constant of a certain reaction is given by #log_(10)k = 5.4 - 212/T#. Calculate the activation energy at #127^@ "C"#? Question #0a2b3 Question #0c7c7 What is the valence of carbon in carbonate ion, #CO_3^(2-)#? Given appropriate data, what energy is released by the combustion of #3080*g# of #"nitromethane"#? Question #9f7c3 Question #16556 Question #d3e79 Question #2b0e0 Question #c7d48 A student calculates the density of iron as 6.6 g/cm3 using lab data for mass and volume. A handbook reveals that the correct value is 7.57 g/cm3. What is the percent error? Question #47d0a If 14.6 mol of iron(III) oxide and 17.5 mol of carbon react, what is the maximum number of moles of iton that can be recovered from the reaction? 2 Fe2O3(s) + 3 C(s) Õ 4 Fe (s) + 3 CO2(g) Question #356e3 Under identical condition the rate of effusion of #"CH"_4# is higher than that of A) #"O"_2# b) #"H"_2# c) #"N"_2# d) #"He"# ??? If 44.9 g of iron(III) oxide and 19.9 g of carbon react, what is the theoretical yield in grams of iron metal? 2 Fe2O3(s) + 3 C(s) Õ 4 Fe (s) + 3 CO2(g) Question #7ac6d Calculate the ratio of catalyzed and uncatalyzed rate constant at 20 degree Celsius if the energy of activation of a catalyst reaction is 20 kilo joule per mole 4 and for an uncatalyst reaction is 75 kilo joule per mole? If 11.1 mol of iron(III) oxide and 22.7 mol of carbon react, how many moles of the excess reactant will remain after the reaction? 2 Fe2O3(s) + 3 C(s) Õ 4 Fe (s) + 3 CO2(g) Sulfur hexafluoride can be synthesized by burning sulfur with fluorine. What is the percent yield of the reaction if 76.8 g of sulfur hexafluoride is recovered from the combustion of 28.7 g of sulfur? S8(s) + 24 F2(g) Õ 8 SF6 (g) Question #78e0d Question #833cb Question #e99ea How does each carbon atom share 1 electron with 3 other carbon atoms? Doesn't carbon have to form 4 bonds because of its 4 unpaired electrons? Question #91621 What is the wavelength light whose frequency is #8xx10^10*s^-1#? Question #b8bef Question #e6b71 Question #36e24 What is specific gravity? Question #31e6d Why do not SOME counterions, for instance barium ion and chloride ion, contribute to solution #pH#? Question #ca32c Question #d3d73 Question #a05b3 Question #1b924 Question #192a4 Question #15216 How do ! make 500 mL of a pH 5.3 buffer from 1 mol/L solutions of acetic acid and sodium acetate? Question #8b425 How many valence electrons are present on the carbon dioxide molecule? Question #4aa93 Question #6f20f Question #0c5da Question #30824 Question #817be Question #7116a Question #b6a70 Question #d4519 Question #f591f Question #f139a Question #2d080 Question #d4154 Question #f07a0 Question #6b6f9 Question #5e4f1 How many neutrons in #""^35Cl#, #""^36Cl#, and #""^37Cl#, respectively? How many electrons in each isotope? What type of bonding is occuring in HC2H3O2? Question #95709 Question #70f06 Question #d3d97 Dry air near sea level has the following composition by volume: N2, 78.08 percent; O2, 20.94 percent; Ar, 0.93 percent; CO2, 0.05 percent. The atmospheric pressure is 1.00 atm. Calculate the concentration of each gas in moles per liter at 0°C? Question #ea806 What are inverse vulcanization reactions? thank you so much Question #88b78 Question #8484f Question #f41cf Question #fb753 Question #3e606 Question #cf244 Question #0a520 Question #3876b Question #973a7 Question #b2fad How do I balance this equation? C4H8S+O2=CO2+H2O+SO3 Question #0e586 Question #6df45 Question #6d080 How do I balance this equation? Al2O3+H2SO4=Al2(SO4)3+H2O Mercury has a concentration in sea water of #0.4*mug*L^-1#. How much mercury in a body of seawater that has an area of #18.5*"mile"^2#, and an average depth of #39.0*ft#? How do electrons participate in a chemical bond? If #0.1144*g# #"magnesium sulfate heptahydrate"# are dissolved in a #500*mL# volume of water, what is the concentration of the salt in #mol*L^-1#? Why did Rutherford predict that most of the alpha particles go through the foil? Question #6da0f Raw milk sours in about 4 hours at #28°C# but in about 48 hours at #5°C#. What is the activation energy (in #(kJ)/(mol)#) for the souring of milk? Question #4b129 Question #22dca What are the parts of an atom? What does each do? Definitions and (clear but easy to understand) explanations, please? Thx! Question #c9621 Question #b6dfa Question #cb744 How would #"barium nitride"# react with water? Question #f4fd4 Question #dcfa6 Question #321ec Question #f9ffd Question #dac2f Question #966f4 What is the concentration of sulfuric acid if a #50*cm^3# volume reacts with #50*cm^3# of #2*mol*dm^-3# #NaOH#? Question #ae545 What is the density of copper with units of #"ounces"# per #"cubic inch"#? Question #ce8f3 What are the most and LEAST electronegative elements? Question #23df9 Question #93a23 Question #90243 What is #"polarity"#, and how does it relate to solvents? Question #55a17 Question #eae42 Question #03041 Question #fa47b What is the principle of atom conservation? Explain with an example. Question #1b9c0 Question #fd226 Calculate the energy, in joules, of a photon of green light having a wavelength of 562nm? Question #39fe5 How would you explain the differences in densities of the 3 states of matter? How are dynamic equilibrium and reversible reactions connected to one another? Question #998e4 What is a supersaturated solution? Question #6cdac Question #a2afa What oxidation states can chromium metal adopt? Question #54e25 Question #128be Question #e4180 Question #38d9f What is the mass in grams of one hydrogen atom? Question #81671 How would you write the electron configuration for the following ions? Question #c323f What are the isotopic symbols for uranium-238 and uranium-235? How do you define concentration with respect to solutions? Question #4af25 Question #89e8a Question #179d2 Question #f98b4 Question #c6e68 Question #feb82 What is the de Broglie wavelength of an electron which is accelerated through a potential difference of 10 kV ? Question #ba1a4 Why is the ionization energy increasing for second and third-row transition metals, but constant for the first-row transition metals? Question #261f7 When does metallic bonding occur? Question #16b9b What is a polyatomic ion? Question #65a84 Why does #NaCl# increased boiling point? Using Hund's rule, how would you write the ground state electronic configurations for the following Ions: a) #O^+# b)#C^-# c)#F^+# d)#O^-2#? Question #8223e What is the ionic bond formation of lithium chloride? Question #67212 Why does #NaCl# lower the boiling point of water? Question #234e5 How is nuclear chemistry used in smoke detectors? Question #eb88a Question #e8806 Question #35c96 Question #347fb Question #b1f5e Question #68604 Question #28aa8 What is a mole and why are moles used? How does each of the following affect the rate of evaporation of a liquid in an open dish? a. intermolecular forces b. temperature c. surface area Question #5ed69 Question #48a71 Question #58a39 What are s,p,d,f orbitals? Water has the molecular formula HO and has a density of 1.00g/cm³ at 25 °C. On average, what is the volume occupied by one water molecule in cm³? Question #ce868 Question #b5804 For the reaction NH3 + O2 --> NO + H2O how many grams of O2 are needed to completely react with 85.15 g of NH3 ? Question #1e694 What is the bond polarity of h2s? Question #38f0a What is the ionic bond formation of calcium and sulfur? Question #26fe8 Question #fd74c Question #59866 How do you calculate the ideal gas law constant? Question #e6b13 Question #49c35 Question #bf711 How do metals obey the octet rule? Question #617f0 Question #8b210 Question #78daa Why is the boiling point of iron higher than magnesium ? Question #623c9 Question #55026 Question #96898 How does NaCl affect boiling point? What is the electron configuration of the #P_3^-#, #Mo_3^+# ions? Is the electron configuration of #1s^2 2s^2 2p^6 3s^2 3p^3 4s^1 3d^6# an excited state electron configuration for Fe? Question #1ffb3 Question #c1c0e Question #9f199 Question #49f2d Question #84418 Question #bb24c Why don't secondary and tertiary amines react with nitrous acid to liberate nitrogen gas? Is H2S dihydrogen monosulfide or dihydrogen sulfide, please explain? How does salt increase boiling point? Question #37b33 Question #87c43 What is the ground state electron configuration of B? Question #57859 How do I use the algebraic method to balance the equation CaCO + HPO Õ Ca(PO) + HCO? What are the limitations of the octet rule? Question #40c1c Question #dcb03 Question #b090c Question #89d76 Question #a8acf Question #dc088 How to write the electron configuration for sulfur? (z=16) What is the electron configuration of Sodium (Na)? Question #ed710 Question #c9b8e Question #be193 How do chemical bonds form between atoms? Question #4b705 Question #6b0c2 Question #a7aee Question #7a6ee Question #d4b59 Question #b86d7 Question #db055 Question #fdf26 What are the units used for the ideal gas law? Question #34be2 Question #7ddec Question #36434 Question #ede60 Question #3f002 Question #0c9fb Question #b171f Question #488ea Question #b6324 How do you calculate enthalpy change of combustion? Question #fc667 Question #a7af2 Question #4dc19 Question #e2388 Question #9ccea Question #3b2a3 Question #564a5 Question #71745 Question #d61e5 Question #59baa Question #57594 What is the ionic bond formation of aluminum and chlorine? Question #189c2 Can someone please explain the basics of hydrogen bonding? How do you find the boiling point of NaCl? Question #65be7 How do you write the charge and full ground-state electron configuration of the monatomic ion most likely to be formed by each of the following? Question #77683 When #2# moles of water are produced, the following reaction has an enthalpy change of reaction equal to #-"184 kJ"#. How much water is produced when this reaction gives off #"1950 kJ"# of heat? How do valence electrons affect reactivity? Why are electronic spins parallel? Question #47f05 Why does the double bond in alkenes make them more reactive than alkanes, which are single-bonded? Question #2695a Question #80c64 How do I determine the molecular shape of a molecule? What is the boiling point of NaCl? What is the electron configuration of aluminium? How does the octet rule relate to the formation of a bond? Question #3b396 Question #044ff What is the structure of L(+) Glucose and L(-) Glucose? What does +, -, and L tell you? Question #16432 Question #50944 Question #b8163 Question #c5690 Draw and name all structural isomers formed by monochlorination of each alkane cyclopentane , CH3CH2CH2CH2CH3 , and (CH3)3CH? Question #2fcfe Question #dc789 How does Charle's law relate to breathing? Question #f2e26 What has higher melting points? Molecular or ionic compounds? Question #5808d Question #1cc3d For butane,write condensed structural formula for an isomer which has only primary and secondary carbon atoms and another isomer which has one tertiary carbon atom? What is the chemical formula for coffee? Question #5f4c9 What is the enthalpy of formation of carbon monoxide in KJ/mol ? C(s) + O2(g) --> CO2(g) ΔH° = -393 kJ 2CO(g) + O2(g) --> 2CO(g) ΔH° = -588 kJ Does the electron configuration of an atom tells us how many electrons are in each orbital? How does counter-current mechanism in the Loop of Henle work? What physical or chemical changes occur in a flame? Question #3df6d How is molecular polarity related to solubility? Question #df1df Why is the #NaCl# boiling point high? Question #8bcb2 Question #8162b Question #f423e How do chemical bonds store energy? How does NaCl affect the boiling point of water? Question #4732e How does adding NaCl to water affect its boiling point? Question #88c8e Question #dfa30 Why is the extra electron not accounted for in #F^-#? Question #7870d Question #3553b Question #4f786 Why is the boiling point of #NaCl# so high? Question #2654f Question #a98ad Question #172e7 How do you balance disproportionation reactions? How do you find the formula mass of ammonium carbonate #(NH4)_2CO_3# ? Question #6dfc5 Molecular orbital theory for polyatomic molecules? How do we rationalize a given organic formula? For instance given #C_3H_4# how many isomers are possible? In the extraction of Fe(III) into diethyl ether, it is desired that the final acid concentration should be 1.0 M to 25 #mL# of the iron solution prepared in 1.0 M #HCl#. What volume of 12.0 M #HCl# should be added so that the final strength becomes 7.0 M? Question #85621 Question #d1e63 Apply collision theory to explain two reasons why increasing the temperature of a reaction by 10 K often doubles the reaction rate? Question #07a03 Question #1c7a0 Question #e7430 Question #49ca9 Question #32224 Question #64eeb Question #c685c Question #e8b94 Question #ccef8 Question #71e56 Question #0859f How come higher the value of Henry's Law constant, the lower is the solubility of a gas in a liquid? What kind of non covalent force is involved in a gecko sticking? By the way, it can stick to both hydrophobic and hydrophilic substances. List and describe the gas laws? Question #a8c5b Question #0a42d Question #861fb Question #fc1eb Question #08092 Question #d1442 Question #e5664 Question #477c1 How do covalent bonds conduct electricity? Question #24719 Question #f79b5 How do valence electrons affect bonding? Question #1a4e7 Question #a0a4c Question #a49cb Question #7884f What is the difference between a 'substrate' and a 'reactant'? Question #7d18e How do covalent bonds hold atoms together? Question #f1a35 What is an example of an electron orbital practice problem? State Berthelot's equation for real gases? Question #d1dd4 Question #320b8 Question #2de19 Question #216cb Question #fcc3e Question #decf6 Question #3c5bd Is crystal growth a chemical or physical process? Question #6cc20 Question #7f520 Question #fd2a5 What is the difference between covalent and ionic bonding? Question #ebc92 What phase of matter is peanut butter? Explain what is meant by the dual nature of light? Question #7ec95 Question #9f50d Question #87123 Question #afe0d How does bond polarity affect the strength of an acid? Explain why solution volume expands when we have positive deviation? Question #f8f28 Question #c528f Which model of an atom is correct?Bohr's or Erwin's Question #79d1c Question #19e68 When Iodine (I2) is mixed with water, the water dissolves some iodine by forming a temporary charge. Does the oxygen from water bond with the Iodine or does the hydrogen? Question #e9c03 Question #41021 Question #ce723 Question #37778 Question #47207 Question #e8163 Question #75c4c Question #caa3b Question #8e2d5 Question #a18bf What are 3 examples that represent the 3 states of matter? Question #00796 How do you balance FeO3 + CO = Fe + CO2? Question #1a191 Question #83757 Why Mendeleev used the formula of oxides and hydrides as one of the basis of classifying his periodic table? Question #59cd6 Question #dee8e Question #c125c Question #4aec1 Question #81ad2 Question #a23c0 Question #567c8 Question #22d95 Question #f018e Question #ac7e9 Question #ec73f Is ammonium chloride magnetic? How do different isotopes of the SAME element differ? Question #15a17 Question #f4cb6 Does the nature of intermolecular forces change when a substance goes from a solid to a liquid, or from a liquid to a gas? What causes a substance to undergo a phase change ? How would you balance the following equation: Fe+O2 --> Fe2O3? Question #3dc47 Question #56574 Question #c12d0 Question #03412 Question #5110d What is the specific heat capacity of water? Question #b8239 Question #7fdb0 Why is 6.02 X 10^23 is also called as Avogadro's number? Which state of matter has the highest potential energy? Question #e7495 5 mol of NH3 gas volume 3L at 35°C.Pressure obtained experimentally is 10.9 atm.Calculate the gas pressure in atm using ideal gas equation and vanderwall equation? Question #cbead Question #1f086 Question #b9088 Question #695bc How do you balance the equation #"Cl"_2 Õ "Cl"^"-" + "OCl"^"-"# in basic solution? Question #046fa Question #d111e Question #4a732 Question #8ec36 Question #c7b1f Question #4aa4e Question #ba5ec Question #c75c4 Question #ae3b3 What do you mean by ion product? What is the definition for the ion product of water? Question #e2154 Question #f93f4 Can you write the equation for the oxidation and reduction half-reactions for the redox reactions below, and then balance the reaction equations? As2O3+HNO3--> As2O5+NO2+H2O Question #dac1b Question #581b8 Why does anion of oxygen have a charge of negative 2? Question #c7050 Question #309de Question #b2a82 Question #9bb2f Question #fc027 How would I purify triphenylmethanol, and how would I know that the sample is pure? How do polar covalent bonds dissolve in water? What is #"red fuming sulfuric acid"#? Question #76404 Does hydrogen bonding have a directional character? Question #d6b39 Question #11baf Question #e86fa Question #01d5a Question #493b6 What are the three most common states of matter? Question #c0b49 Question #81437 Question #01ad1 Question #825ea How do I make a Lineweaver-Burk (Double Reciprocal) Plot? Question #1ddfb Question #45d18 What is specific latent heat? Question #c6b84 Question #99528 Question #9836b Question #fb120 How are ions arranged in ionic crystals? Question #a8c50 Question #6bdcc Question #fe6ab Question #f7dfe What is the specific heat of zinc? Question #792b7 Question #ef6e6 Question #59bca Question #d7477 Engine degreaser, #Cl_2C=CHCl#, is used for cleaning for automotive parts? Is it a single use solvent? Question #b35ed Question #030d6 What is the derivation for the half life of a second order reaction with: (i) equal concentration of reactants for the reaction #2A -> "product"# (ii) unequal concentration of reactants for the reaction #A + B -> "product"#? Question #fb18f Which has the lower value of pka ?? (a) 3-methyl-2-butanol (b) p-hydroxybenzaldehyde; I need some explanation for my thesis work. Question #27ab1 How would you balance the following equation: N2O5 --> NO2+O2? Question #5fe7f Question #e7079 What is the specific heat of air? Question #2ed36 .Please let me know why it is necessary to scrupulously oven-or flame-dry the glass used in Grignard reaction? Please write the reaction. How do you measure specific heat? Question #5486d Question #93771 Question #8dee3 Question #36998 How would you balance the following equation: HCl+ K2CO3 --> CO2+KCl+H20? Question #ba955 Question #18833 Question #c3ff1 Question #d0aff How to remember molecular bond angles? How can I calculate wavelength given frequency? What is the s,p,d,f configuration of Co? How do colligative properties affect temperatures in a distillation? How reactive is white phosphorus? Question #44981 How does silver ion react with (i) chloride ion; and (ii) ammonia? What are some common mistakes students make when naming Alkanes? What is special about water as a solvent that allows it to dissolve ionic salts? How would you balance the following equation: H3BO3 --> H4B6O11 + H2O? Why is the Hess' law important in physics? What is the molecular mass of a compound if 560mL have a mass of 1.10g at STP? Question #f4420 Question #19cbb What does the "C" in the specific heat formula represent? Question #4fa20 How would you balance the following equation: H2 + O2 --> H2O? Hi may i know in the preparation of soluble salts, when do we use titration? Thanks Question #13e16 Question #2dbef Question #bca3f Question #1cda1 Question #d4b5d Question #d90c9 Question #7b78e Question #b241d Question #0406f What is the difference between heat capacity and specific heat? Question #e55ba What are synthesis reactions? Why are catalysts not consumed in the reaction? Question #44369 What is the specific heat capacity of silver? How and why does xenon-135 decay to cesium-135? What is the nuclear equation for the process? What are the rules for predicting products of the various types of acid base reaction? Using an arrow,indicate the direction of polarity on all covalent bonds. Predict ,which molecules are polar and show the direction of dipole moment (a)CH3Cl (b)SO3 (c)PCl3 (d)NCl3 (d)CO2? Please explain me if we created a vacuum and lowered the boiling temperature would we still get in extracting the essential oils successfully??? Please guide me, thank you so much. What reaction occurs between hydrazine and cyclopentane? Considering only the formal charge , determine the major contributor among the canonical resonance structures of the following speciea. Explain. Nitrite ion(NO-2) and SCN^-? Is the following equation balanced: NH2CH2COOH (s) + 9/4 O2 --> 2 CO2 (s) + 5/2 H2O (l) + 1/2 N2 (g)? How would you balance the following equation: #"Na"_2"SO"_4" + Fe"_2"(NO"_3)"_3##rarr##"NaNO"_3" + Fe"_2"(SO"_4)_3"#? Which is the stronger Lewis acid, #"iron(III) chloride"#, or #"chromium(III) chloride"#? How would you balance the following equation: LiOH + HNO3? Please let me know about the basics of Phosphorescent and Fluorescent materials.? Thank you. Question #9f407 Question #60b33 Question #9f125 Is the dissociation of water endothermic? Question #4a87e Question #46416 How is oxygen gas, and hydrogen gas isolated? Question #76c9d Question #774ec What is the specific heat of ice? Which are fluorescing / phosphorescing powders or dyes that is dissolved in the water to illuminate the droplets when UV light fall? Question #56f6b Question #89643 Question #07161 Which of the following are inner transition metals? No, Sn, Mg, Am. Question #6f1c9 Question #e484d Question #1efaf How would you balance the following equation: I2+HNO3 --> HIO3+NO2+H2O? Question #a454b Question #7ab99 How do you calculate specific heat capacity? Question #35ddb Question #d5404 Question #4b7e9 What is the structural formula for ozone? Question #2f15f How would you balance the following equation: HCI + NaOH --> H20 + NaCI? Question #e22a4 How would you balance the following equation: P + O2 --> P4O10? Question #85c45 How would you balance the following equation: H2O2--> H2O+O2? Give chemical reactions to show the action of #CO_2# & ethanal on methyl magnesium bromide and methyl lithium? Question #60472 Question #29157 Question #4a7dc A compound that contains 6.44g of boron and 1.80g of hydrogen has a molar mass of approximately 28g/mol. What is its molecular formula? Please tell the name of pH paper and pH meter that are used for detect the pH of oil? Question #7cbbf Why is water often used as a solvent for recrystallization? On the other hand, why are benzene, and carbon tetrachloride rarely used for recrystallization? Question #4d379 Question #3979d What type of bond does the compound Pb(C2H3O2)2 have? Question #743d0 Question #24d06 Question #50ea9 Question #37f59 Question #1d53d Question #069a0 Question #89968 Question #5820a Can you walk through the steps for balancing #"Cr"_2"O"_7^(2-) + "SO"_3^(2-) + "H"^+ Õ "Cr"^(3+) + "SO"_4^(2-) + "H"_2"O"#? Question #03e13 Question #90a07 Question #f3a4d Question #fef8f Question #39cd6 Question #684a7 Question #b0849 What is stoichiometry? Question #23b0f Question #a806c Question #cfb34 Question #b5f2f Question #4d7e1 Question #5da6b Question #eb6e1 What is the derivation for the half life of a second order reaction with: (i) equal concentration of reactants for the reaction 2AÕproduct (ii) unequal concentration of reactants for the reaction A+BÕproduct? Question #baed5 Question #240f6 Question #8ea8f Question #dc13f Calculate in kilojoules per mole the energy necessary to completely remove an electron from the first shell of a hydrogen atom (Rq = 1.097 * 10-2 nm-1).? Question #20891 Question #1f4ef Question #4452b Question #c8081 Question #efd79 Question #57626 How do valence electrons affect the properties of atoms? Question #59ff9 How does energy pass through greenhouse gases? Question #eb8de Question #8cf48 Question #f2749 Question #8389b Question #4d030 Question #e68ef Question #e6c61 O2N-N2O is homolysis or heterolysis? What is the product? Why hydrogen bonds are formed? Question #ee087 What is the basic difference between Fluorescence and Phosphorescence? Question #8ce8a Question #6d1f9 Question #57b5a Question #7646e Question #769d7 Question #47b64 Question #23f59 Question #48338 Question #47992 Question #24069 Question #9a211 Question #39275 Question #ff6d6 Question #a8a55 Is it true that sodium chloride is MORE soluble in #1*mol*L^-1# #"hydrochloric acid"# than in pure water? Question #cd1d3 Question #c526f Question #959a7 How do transverse waves transfer energy? Question #a490c Question #cd102 Question #4a8a0 What products result from the hydrolysis of #"isopropyl formate"#? Question #f9f33 For #HClO(aq)#, #K_a=3.0xx10^-8#..what is #pH# of a formal #0.1000*mol*L^-1# solution? Question #02ea0 Question #959b2 Question #8cf4e Which of the following species can be Bronsted-Lowry bases? a- -OH b- Ca2+ c- C2H6 d- PO43- e- -OCl f- MgCO3 Question #a2d61 Question #835de Question #fbf93 Question #8236d Question #6474c Question #8a711 Question #262df Question #afbe6 Question #c175b Question #4a60a When iron(II) sulfate dissolves in water, does iron(II) form a complex ion with water surrounding it? Question #38cf7 Question #90286 Question #8faef Question #b5bf3 Question #9df1e Question #53c41 Question #54463 Question #aff94 Question #9a0ed Question #bb19d Question #31f57 Question #50ad4 Question #8097e Question #8c6c0 Question #28c13 What is the purpose of writing chemical equations? I am on an online Chem lab. One of our questions is "can you use a beaker to prepare a solution by dilution, instead of using a volumetric flask? Why or why not?" We watched a video but it doesn't give help to this question at all. Question #9b627 Question #d229b Question #d98ef Does Le Chatelier's Principle apply to solids? Question #0b7cd What is the octet rule of nitrogen? What physical properties does oil have? What is the ionic bond formation of NaCl? Question #85b68 Question #f499c If the average adult is to exhale #"1.0 kg"# of #"CO"_2#, how much glucose was involved? Question #e98d7 Question #97ad0 Question #c79a1 Question #4461f What pieces of information from the periodic table are needed for isotope notation? Question #8ce96 What is the ionic formula for sodium nitrate? How does zinc chloride solution react with sodium hydroxide solution, drop wise then to excess? Question #2974d Question #cb7dd Question #12a0e How can you determine the #sf(pK_a)# of a drug experimentally ? Question #2c5a4 Question #3288e What is the final temperature of water if it used 520 J from 52 degrees C? How do you grow good quality crystals? Is electrostatic same as static electricity? Question #f6986 Question #b908c Question #e98dc Question #fcf69 Question #cd34d Question #9f4ad Question #34f23 Question #1b4cf Assuming that you can only make 863 g Ag, what is the percent yield of Ag if you actually recover 1018 g Ag? Question #a8ad7 3NO(g) + HO(l) Õ 2HNO(l) + NO(g). If 3.9 mol NO and 0.50 mol HO combine and react completely, how many moles of the excess reactant are present after the reaction is complete? Question #1adf2 Question #c85df Question #7316b What is the s,p,d,f configuration of argon? Question #09131 Question #5cdf7 Question #e2aa3 Question #2a61c Question #22229 Question #2a211 Question #5e658 Question #e162a How can the periodic table be used to determine molar mass? What forms when aluminium hydroxide neutralise hydrochloric acid? Question #285cc Question #34c34 Question #1b494 Question #d5201 Question #c1ad8 Question #6a12e Question #f548b A mixture contains 10.0 g each of the three gases nitrogen, oxygen, and argon. What is the mole fraction of nitrogen in the mixture? Question #c533c Does ideal gas law apply to liquids? Question #85a0f Question #e2f35 Question #efa05 Question #7d30f Question #de8bc Question #ac468 What is the general valence-electron ground-state electron configuration for neutral alkaline earth metals? A) ns2 B) 1s22s2 C) 1s22s1 D) ns1 Question #02ada Question #73ea6 Question #883d7 How do you name simple ionic compounds? Question #e65c2 A sample of gas has a pressure of 854 torr at 285 degree C. To what Celsius temperature must the gas be heated to double its pressure if there is no change in the volume of the gas? Question #0118d Question #1bd4a Question #52fdb How are osmolarity and osmolality different? Question #4b5e4 What is the s,p,d,f configuration of iron? Question #b15ab Question #c2a2e Question #f33dd Question #2da28 Question #1bdf3 Question #7e986 Question #337a5 Question #ee86f Question #427aa If two oil drops can be held motionless in a Millikan oil-drop experiment, would the ratios of what two properties of the drops have to be equal? How do you complete and balance nuclear equations? Question #6e418 Question #7216f Question #45e2e Question #f61f5 How do I balance the chemical equation for the reaction between potassium hydroxide #("KOH")# and phosphoric acid #"H"_3"PO"_4"# that produces potassium phosphate #"K"_3"PO"_4"# and water #("H"_2"O")#? Question #e6c52 Question #85a29 Question #cb11d Question #cc053 Question #fadc3 Question #406b5 Question #fba0c Question #8c731 Question #2f33d Question #faceb Question #f94df Question #f91dc #"32.0 g H"_2# reacts with #"12.0 g O"_2# to produce #"H"_2"O"#. What is the limiting reactant? What mass of #"H"_2"O"# can be produced? Question #fe5e6 Question #f8b14 Question #7a4c0 Question #67dbe Question #5e210 Question #d8aba Question #ec219 Question #d4ec7 Question #1fe75 Question #48b0f What is the valency of selenium? Which alcohol is more soluble in water: ethanol; propanol; isopropanol; butanol? Question #1dced How many ketones can have a formula of #C_4H_8O#? Question #dd0db Question #f3786 Question #45ac8 How are hydrogen bonds different from covalent bonds? Question #11b51 Question #f9c18 Question #d6266 Question #196ca Question #8dca8 Question #04ce5 Question #047d7 Question #f825f Question #03362 Question #fa0cb Question #7321f Question #b8230 Question #37be3 Question #19ab7 Question #f41c1 Question #7349a Question #1febd Question #08da2 Question #168e9 Question #06aff Question #812ab What is the balanced equation for sodium chloride? Question #70765 Question #d6499 Question #a945a Question #37e92 How is hydrogen bonding among water molecules related to the structure of the water molecule? What is the valence electron configuration for phosphorus? I did a Magnesium Oxide Lab.Magnesium often reacts with nitrogen in the air. If some of the magnesium had reacted with the nitrogen, would it make the % composition of ur sample higher or lower than it should be? Explain (Hint-Try a sample calculation). What is the energy of an element whose emission spectrum has a wavelength of 450 nm? i don't need an explanation; i just want to see if my answer's correct. ( 4.4 x 10^-19 J)? Question #15ebc Question #10ffd Question #c548d Which orbital in #"FeCl"_3"# accepts a lone pair? Question #487aa Question #394c1 Question #73dc8 Question #2d8b6 Question #55903 Question #ab188 Question #2d25d Question #51512 Question #5177d Question #7a210 Question #fc4a2 Question #354ab Question #a63f3 Question #68204 Question #81c24 Question #b327d Combustion analysis of a 31.472 mg sample of the widely used flame retardant Decabrom gave 1.444 mg of #CO_2#. Is the molecular formula of Decabrom #C_12Br_10O# or #C_12H_10O#? What is the molar quantity of #5.23*g# of #CuCl_2#? Give the different combinations of RX and R'X that can be used to synthesize 3-methylpentane. Write the IUPAC name for rach of the RX and R'X? Which biomolecules are insoluble in water? Question #4e07c Question #584fe Question #7d3f9 Question #105f1 How many grams of glucose would you need to make 500ml of a 16% solution? Question #61757 Question #e5b12 What happens to a protein or nucleic acid if it is denatured? Why are there three moles of oxygen in one mole of potassium nitrate? Question #50f0a Question #058f3 Question #0103f Question #48f37 Question #0192d Question #307e7 Question #8d049 Can a metal react with a solid compound? Question #00801 Is the boiling of water a physical or chemical change? Question #6ecac Question #84578 Question #88dc9 Question #2c09c Question #5aa40 Why is heat capacity different for different materials? Question #cf892 When shown a molecule structure, and how do you write the molecular formula for its molecule? and in what order should it be written? Ex: I have C = 7, O = 2, H = 7, N =1 Question #8f7f5 Question #0f302 Question #fcd98 Question #dfeea Question #53e94 Question #73d3f Question #fd8a9 Question #81415 How do functional groups affect organic molecules? Question #058c6 Question #54647 Question #586e1 Question #36631 Question #137ac Question #af66a Question #7ab5c Question #c2135 Question #ca016 Question #a089a Question #789fb Question #49d33 Why do noble gases have the highest ionization energies? What are the metabolic pathways of glucose? What are other molecules that can be produced from glucose? Question #84b92 What is methyorange and is it a pure substance or a mixture? How many grams of acetic acid would you use to make 10 L of a 0.1 M aqueous solution of acetic acid? A slice of pizza has 500 kcal. If the pizza is burned and its heat is used to warm a 50-L container of cold water, what would be the approximate increase in the temperature of the water? (Note: A liter of cold water weighs about 1 kg). Question #a9625 Question #42446 Question #57d72 How is #NH_4SO_4# used in biochemical analysis? Question #c2c85 Question #582a7 Question #a02ea Question #25a3c Question #37c75 Question #28632 Question #40c51 Question #918e1 Question #5788c Question #3386a Question #56615 Question #30fef What transverse wave can travel in a vacuum? Question #238fd Question #238ea Question #ee342 How does #"Avogadro's number"# relate to the atomic mass of #""^12C# isotope? Question #5411c Question #8d55e Question #bd835 How to add #1.805xx10^4# and #5.89xx10^4#? Question #52a88 Which has a greater volume: 1000g of water or 1000g of ethanol? i found it and put in in sig figs (because we're always supposed to) and the volumes are both 1000mL. should i say they're equal, or base it off the actual values w/o considering sig figs? Question #cb484 Question #d4f79 Question #5b00f Question #be039 Question #ca9d0 Question #4956d Question #1ee89 Question #60eeb Question #36647 Question #98045 Question #bd267 Question #99e58 Question #0fc9d Question #31e24 Question #60618 Question #ea7b9 Question #d1325 Question #9805e Question #bdfa0 Question #5e950 Question #5dcd6 Question #7189d Question #6823f Question #2171c Question #0bb61 Question #94e8a Question #c2abd Question #0a50e Question #5bc90 Question #215d1 How do you know, if the atom will have an alpha, beta or gamma radioactive decay? Question #5298e Question #c8c1c What would be the product when 2-methyl-2-propyloxirane with CH3MgBr?? Please let me know what would be the product when 2-ethyl-2,3-dimethyloxirane reacts with HBr ?????? Question #e1c88 Question #e86e6 Question #e9ffe Question #5702e Question #fafb5 Question #ff526 Question #e8bec Question #e6dea Question #7bf15 Question #e4841 Question #b13eb Question #e45c3 Question #e3d47 Question #110ec Question #53a26 Question #31da8 Question #0ed7c Question #37ca5 Question #5286d Question #eb90d Question #9be1f Question #0f053 Question #30380 Question #1548e Question #53729 Question #84c56 When and who made the building like buckyball shaped? Question #d897c A reaction starting with 8.0 g of benzoic acid, excess methanol, and excess phenyl magnesium bromide.What would be the expected theoretical yield of triphylmethanol?? If 5.36 g of triphenylmethanol is end product, what is % yield?Show all calculation. Question #08034 Question #6aeb8 In the U.S., the emissions limit for carbon monoxide in motorcycle engine exhaust is 12.0 g CO per km driven. What is this limit expressed in milligrams per mile (mg/mi)? Question #5b282 Question #06472 Question #d5461 Question #8f8ad Question #43a59 (9.38) x (53201) = 499025.4 What is the answer express to the correct number of significant figures? Question #0f6b8 Cos(38.1) = 0.7869350 What is the answer expressed to the correct number of significant figures. How do you know what the significant figures here? Write the products of homolysis or heterolysis of each bond (a) H3C-CH3 (b) O2N-N2O(c) CH3O-H (d) H3CH2C-MgBr organic chemistry? Question #ec5ae Question #2888d Question #15a04 Question #15780 Question #1853d Question #ea93d Question #2327d Please let me know about the clear differences b/w Alkaloid and Fatty acid ?? Question #276cd Question #45d65 Can metals be in a gaseous state? Question #5ce69 Question #6e145 Question #12364 Question #0492f Question #98c93 Question #5404b Question #13607 How do you solve for V2, using Avogadro's Law when moles of a gas are added(n2)? A sample containing 7.20g O2 gas has a volume of 35.0L. Pressure and temperature remain constant. What is the new volume if 0.800mole O2 gas is added? Question #6bb1b Question #731c8 Question #bb7e3 How do chromium metal, and #Pb^(2+)# interact electrochemically? Question #93523 Question #e86d2 Question #9d06f Why are gases more soluble in solvent when the pressure of the gas above the solution is GREATER? Question #b8e23 Question #1975f How much will 1g of Strontium Chloride increase 100L of water? Question #7d181 What is a metallic compound? Question #2c71b Question #e7412 Question #25cc7 Question #d803f Question #07b66 Question #4bdec What is the difference between qualitative and quantitative? Question #cdf35 Question #07873 Question #c6471 What mass of iron can be extracted from 1000kg of iron ore ? Question #87507 Suppose you ran this sequence of reaction starting with 8.0 g of benzoic acid, excess methanol, and excess phenyl magnesium bromide.What would be the expected theoretical yield of triphylmethanol?? Show all calculation. Question #b5151 Question #86c9a What is the purpose of adding sufuric acid at the end of the Gringard reaction?? Please let me know why it is necessary to scrupulously oven-or flame-dry the glass used in Grignard reaction? Please write the reaction. In the extraction procedures, how do I know layer is on top and which is on the bottom???? Question #b65b0 Question #04c5d Question #f862c Question #4b846 Question #63dd0 Question #0313d Question #62abf When the soft drink can is opened bubbles appear :can this be use to explain the principle behind effervescence when antacid tablets are added to water? #rho_"copper"=8.96*g*cm^-3#; #rho_"zinc"=7.14*g*cm^-3#. If brass alloy is prepared from 70% copper and 30% zinc BY MASS, what should be the density of the resultant alloy? Question #292a4 Question #826b9 Question #7b58b Question #7d724 Question #7dd86 Question #09556 Question #4207e Question #7f361 Question #ecddb How to prepare 1-phenyl-3-methyl -2- butanol?? Thank you in advance Question #b879e Question #f8020 Question #aac5b Question #2d821 Question #d7f4a Question #f5e35 Question #10880 Question #a1cbf Question #b9cff Why xenon being a noble gas forms compounds with other elements? Question #f383a Question #6b864 Question #cee6a Question #cc287 Question #99113 What is the SMART query for carboxylic acids ??? How are dextrorotatory compounds, laevorotatory compounds, D form and L form different from each other? Question #e8f5c Question #7e6da How can we benefit from chemistry? Please let me know which is more soluble in water 1-Octanol or 1,3-Propanediol, and please what is the reasons and explain. ?? Thank you Question #604c3 Question #62ac8 Question #19ccd Question #75490 Question #751f0 What is the electronic configuration of beryllium? Question #a33e0 Question #5c973 Question #5f708 You have 75.0 grams of C2H2Cl4, how many L of Cl2 do you have? Question #e4858 What happens to the partial pressure of oxygen in the air if the air temperature is increased? Does the following reaction show an increase or decrease in entropy? H2O(l) ---> H2O(s) Question #4d8ad Question #6b829 Question #ea11a Draw and name all structural isomers formed by monochlorination of (CH3)3CH? Question #17e23 Question #41f5c Question #de465 Question #254ee Question #36f2e Question #e2184 Question #54740 Question #2e817 Question #b422e Question #497ee Question #3d866 Question #6b26a Question #71cf2 Question #e47c7 Question #a675e Explain.(i)Pentane is distilled off first when a liquid mixture containing pentane,heptane and nonane is heated.(ii)Hexane floats on water. (iii) cyclopentane may be easily separated from an aqueous salt solution? Question #39452 Question #84084 Question #08b07 Question #b9d1d Determine the geometries using vsepr theory .State the approximate bond angle(s) in each molecule and determine whether each molecule is polar or non polar a)BCl3 b)PCl5 c)NCl3 d)SO3 e)XeF4 f)HBF2? Question #17960 Question #0aa3f A. Label the amount of water in each of the three beakers to the correct number of significant figures. b. Is it possible for each of the three beakers to contain the exact same amount of water? If yes, why? Question #564da Question #8f0ac What occurs when sodium metal is added to liquid ammonia? Question #37374 Question #377c9 Question #fe002 Question #9abed Question #cdf67 Why is the uncertainty principle not significant when describing the behavior of macroscopic objects, but it is very significant when describing the behavior of electrons? Question #e9e3b Question #e5aab Question #4aa3a Question #a668a What is the daughter isotope produced by the #alpha# decay of #""_86^222Rn# ? Question #fa0d5 Question #73e32 How do you calculate molality of a solution? What balanced equation represents nuclear fusion? Question #a4fbf Question #b89a5 Question #345fa Question #6e2e1 How do intermolecular forces affect surface tension? Question #2bb64 Question #7258b How did we know that copper and chromium have different electronic configuration?? 0.62g Cr reacted with 25cm3 of HCl . After the reaction had completed, the resultant solution required 7.55cm3 of 2M sodium NaOH for complete reaction. a) Calculate the number of moles of unreacted HCl? Thanks. Question #adbf9 Question #3141c Question #7c622 Derive the expression for second order reaction with unequal concentration for a reaction #A + B -># product when (1) if a > b & (2) if b > a, where "a mol/#dm^3#" and "b mol/#dm^3#" are the initial concentrations of A & B respectively? Question #acf82 Question #e6f01 Question #817f2 Question #2b54a Question #adc83 Question #3256c Question #aadf1 Question #a92e2 Question #a7cc0 Question #5bccc Question #f7670 Question #ed244 Question #a276b Question #a313d What is the order of a reaction that has a constant half - life ? A packet of energy is called ? a) a wavelength b) a wave c) a quantum d) a proton Question #dcb38 What are the formal charges for each of the atoms in #NH_3#, and #NH_4^+#? Question #7a72f Question #d3fcc Question #3ee4f Question #a0e10 Question #71724 Question #a19be Question #62b13 Question #6363a Question #f36bb How to know covalent bond with highest polarity? Question #5e4a1 Why can the behaviour of gases with respect to pressure, temperature, and number of particles be reasonably well-predicted? Question #f21ab CO (g) + ½ O2(g) Ö CO2(g In an experiment, 4.95 mol of CO2, 0.050 mol of CO and 0.050 mol of O2 are placed in a 5.0 L reaction vessel at 1400 °K. If Kc = 1.05 x 10-5, what will the equilibrium concentrations be for each reactant and product? Question #8cd48 Question #b0b83 Is petrol a reducing species? Question #3c6bf Question #3549b Question #dfc50 Which of the following statements is true when comparing the following two hypothetical buffer solutions? (Assume HA is a weak acid.) (See choices in answer). Question #9d02c Question #a7e7f Question #e92fb Question #1c963 Question #4f95a Which pH paper and pH meter that are used for detect the pH of oil? Question #0eccd Question #fa9c0 Question #bbe50 Question #eed51 Question #bd009 Question #17100 Question #7812e Question #885ed Question #66290 Question #9ea2c Question #c823c Question #a8da2 Question #cdd5b Question #8c0a1 Question #1a274 Question #8a5c4 Question #b0f24 What is the velocity of reaction?? what is rate of reaction ? what is instantaneous rate of reaction ??? Question #ee915 Question #b4b70 Why is the first ionization energy of oxygen lower than the first I.E of fluorine? (3 marks) An aq soln of #NaH_2PO_4# is treated with a mixture of ammonium & magnesium ions to precipitate #Mg(NH_4)PO_4. 6H_2O# & is heated to #Mg_2P_2O_7# which is weighed. A soln of #NaH_2PO_4# gives 1.054 g of #Mg_2P_2O_7#. What's original weight of #NaH_2PO_4#? Question #c5d36 Question #06db7 Question #4e19a The percentage purity of commercial #HCl# is 35% (w/w) & the specific gravity of the solution is 1.18 #g#/#ml#. What is the molarity, molality and normality? Question #43032 Question #01908 What is the valence electron configuration for potassium? Question #dba95 Question #efae2 Question #409bf Question #8d3ca Question #30c1c Question #d7b43 Question #f8743 Question #469d1 Question #d0227 Question #9b3b1 Are aerosols colloids or are they gaseous solutions? Question #9b3eb Question #e680e Question #3d61b Question #46078 Question #8a898 Question #d310d Question #1a32c Question #f0024 Summarize HSAB theory? How do we identify the conjugate base for #C_2H_5OH#? Question #7a532 Question #47b4c Question #69fb0 Question #2acfc Question #d39c9 Numerical: How will you prepare a 0.5 N #Na_2CO_3# solution having a volume of 150 ml? How do you prepare a 1 M #HCl# solution, which has a specific gravity of 1.18? The #HCl# solution has 35% purity. Calculate the volume required to prepare the solution. Question #962e0 How do you draw s,p,d,f orbitals? Question #e921c Question #677cc Can anyone solve this? From a 95% ethanol solution, prepare a 125 ml of a 75% ethanol solution. Question #06dfd Question #61d1a What effect does changing the state of matter by applying pressure have on temperature? Question #ae74b Why is it easy to work with normality than molarity? Can someone explain this question to me, preferably with an example? Question #431c9 Question #465ac Explain Octet rule? A transition of an electron between two different energy levels produced a series of line spectrum . calculate the wavelength of () line in Paschen series. wavelength in nanometer? Question #589f8 Question #4213c Question #d47a0 Question #2256c Question #40883 Question #19041 Question #edcc7 Question #95f7b Question #95f75 Question #accf4 Question #6f539 Question #602de Question #ed275 Question #c01c1 Question #0f860 Question #d378d Question #d347e Why do alkalis have a slippery feel but acids don't ? Question #49bdd Question #d63d5 How do I calculate the number of theoretical plates in gas chromatography? Question #d08b9 Question #c9893 Question #5dbac Question #bf7ed A Big Mac hamburger from McDonald’s contains 540 Calories. (a) How many kilojoules does a Big Mac contain? (b) For how many hours could the amount of energy in a Big Mac light a 100 watt light- bulb? (1 watt = 1 J/s) Question #d8403 Question #bf528 Question #c8999 Question #5bc9e Question #5bc49 Question #e5682 Question #48630 What are radicals? Consider the reaction: #P_(4(s))+3NaOH_((aq))+3H_2O_((l))rarrPH_(3(g))+3H_2PO_(2(aq)# Is this an oxidation reaction or a reduction reaction ? Question #e53fd Question #59f68 Question #c6e34 How to draw chemical bonding? Question #cc292 Question #f4867 Question #ddd94 Question #9c864 Question #a1288 Question #1d77e How can you separate a mixture of nitrobenzene and phenyl amine? Question #0c91b Question #f8d64 A block of wood 3.0cm on each side has a mass of 27g. What is the density of this block? Answer: 1.0 #"g/cm"^3#. What is the product when you put nitrobenzene and Tin in dilute HCl? How to predict this? Question #52717 Question #b2dee Question #8cd0c Question #749a8 Question #06b89 Question #730c8 Question #99000 Question #333e7 Question #84a1b Question #bcb2d How we can understand the rate of reaction by chemical method? Question #1ef5c Question #96b32 16. A 4.37 g sample of a certain diatomic gas occupies a volume of 3.00-L at 1.00 atm and a temperature of 45°C. Identify the gas. Anyone please help? What is rate constant and what is specific rate constant? Question #b86e1 Question #a418f Question #fabcb Question #155a3 Question #16b1a Question #90c84 What are organic solvents? A) Which group of elements is the most metallic? b) Which group of nonmetals is the most reactive? c) Which group of nonmetals is the least reactive? 6) What is the most chemically reactive metal? 7) What is the most chemically reactive nonmetal? Question #8adcc The total pressure in an 12.7L automobile tire is 42.0psi at #16.0^@"C"#. How much does the pressure in the tire rise if it warms to a temperature of #39.0^@"C"# and the volume remains at 12.7L ? Question #936e6 Question #25b8d Question #10710 Question #14210 How do you calculate enthalpy change? Question #648be Why does the color of sugar turns black when heated in a dry test tube for sometime? Is it thermal decomposition? Question #26315 Question #10363 How would you justify whether reactivity is a chemical or physical property? Question #01869 Question #1926f Question #d600c Question #a27cb Question #69f56 Question #2efa4 Question #07cbd Question #4321c Question #0f321 Question #f9d2d A sample of hydrogen gas is mixed with water vapor. The mixture has a total pressure of 745torr, and the water vapor has a partial pressure of 24 torr. What is the partial pressure of the hydrogen gas? Question #a4b03 Question #06504 Question #051a6 Question #019e5 Question #b9f77 Question #33ced Question #f9c65 Question #c4ffb Question #d9289 Question #2bb56 Question #635c0 Question #b978c Question #17fa1 Question #56108 Question #6406a Calculate the molality of a solution containing 275g glucose(#C_6H_12O_6#) dissolved in 1.08L of water? (Assume a density of 1.00 g/mL for water.) To what volume should you dilute 60mL of a 10.5M #H_2SO_4# solution to obtain a 1.70M #H_2SO_4# solution? Question #c67e4 A 52 g piece of a metal is heated to 125 degrees C. It is placed in 80 mL of water at 23 degrees C. If the final temperature of the water is 29 degrees C, then what is the specific heat of the metal? Question #fe7dc Question #849a9 Question #10184 Question #3f456 Question #198f3 Question #89376 How do polar bonds contribute to the polarity of a molecule? Question #cf3e2 Question #70d42 You have three covalent compounds with three very different boiling points. All of the compounds have similar molar mass and relative shape. Explain how these three compounds could have very different boiling points ? Question #96aff Question #7afda Question #71ace How do you balance this redox reaction using the oxydation number method ? #KClO_3 + H_2SO_4 -> ClO_4^(-) + ClO_2 + SO_4^(2-) + K^(+) + H_2O# What are the decay products when U 235 undergoes #sf(alpha)# decay ? Question #3e4cb Question #33d54 Question #17995 Question #2d3d6 Question #eef7d Question #fa36e Question #dfcee Question #c88b3 Question #7e3ca Which of the following are liquid at a room temperature and how can you tell? I, Br, Ne, Pb, Hg. Question #e1551 Question #c34c3 Question #128ff Question #86338 A supply of NaOH contains the contaminants NaCl and MgCl2. A 4.9995g sample of this material is dissolved and diluted to 500mL, 20mL of this is titrated with 22.26mL of a 0.1989M solution of HCl. What is the percent NaOH of the original solution? A mole of a substance can be defined as: #"A."#The number of atoms in a 12g sample of C-12 #"B."#The amount of substance that contains #6.02xx10^(23)# atoms #"C."#The quantity of a substance that contains one gram formula weight of the substance? Question #1a112 Question #2609e Question #8f311 Question #bc8a8 Question #e207f How does the octet rule determine the charge of an ion? Question #25639 Question #71764 A certain saturated hydrocarbon effuses about half as fast as methane, #CH_4#. What is the molar mass, in g/mol, of this hydrocarbon ? Under conditions in which the density of #CO_2# is 1.96gL and that of #N_2# is 1.25 gL , which gas will effuse more rapidly? What will the ratio of the rates of effusion of #N_2# to #CO_2#? Question #98f20 Question #1a219 Question #f4530 Question #258cb Question #51bee Question #dda16 How will the Fe reach noble gas configuration? The problem I have is that, for example in FeO, iron may keep its 8 valence electrons, but it still won't reach noble gas configuration nor electron octet. Question #0c81e Question #e9418 Question #ab48f Question #49c36 Question #d8b3d Question #eb66b Question #21f8f Can a metal less reactive than hydrogen in a metal carbonate react with acid to produce #CO_2#, #H_2O# and salt? Thank you. Question #f337e Question #efd38 Question #d77c8 Question #f0c3c Question #03916 Question #cc0a6 Question #cbab4 Question #18f5d Question #eaed6 What is the formula for Magnesium Triiodine? I think it is Mg(I3)2 but wanting to confirm. What is the easiest way to solve problems involving gas laws? Question #ff4b9 Question #8859b Question #2b066 Question #24a44 Question #2486b Question #eb6b2 Question #fc354 Aluminum reacts with hydrochloric acid according to the equation. #2Al_((g)) + 6HCl_((aq)) -> 2AlCl_(3(aq)) +3H_(2(g))#. Calculate the volume of 1.50mol/L hydrochloric acid that is required for 5.40g of Aluminum to react completey? Question #ef2cd Question #1d847 Question #ea38a Question #1e21a Question #f7a15 Question #f56fc Question #bbd5b Question #3019f Question #7013f Question #f6dcf Question #20ae1 Question #fe1d2 Question #17d95 Question #7c782 Question #7427d Question #fc2ac Question #fc98f Question #388f4 Question #f79e5 Question #b9954 #"Z"^-# is a weak base. An aqueous solution prepared by dissolving 0.350 mol of #"NaZ"# in sufficient water to yield 1.0 L of solution has a pH of 8.93 at 25.0 °C. What is the #K_"b"# of #"Z"^-#? Question #adb34 Question #eead2 Question #d312c For hydrogen, what is the wavelength of the photon emitted when an electron drops from a 4d orbital to a 2p orbital in a hydrogen atom? The Rydberg constant is 1.097 × 10-2 nm-1. How many electrons are in the valence shell of I in IF4- ? A) 14 B) 12 C) 10 D) 8 How many lone pairs of electrons are on the P atom in PF3? A) 2 B) 1 C) 0 D)3 Question #301b7 Question #3144e Question #70bb0 Question #310dc Question #41320 Question #30208 Question #d9f7f Question #41339 Question #d9fcd Question #415c1 Question #76473 Question #717a5 Question #71706 Question #71543 Question #d40c3 Question #be9e8 Question #75022 Question #b1f67 Question #732ac What is the reaction between potassium and water? Question #6cf21 Question #03635 Question #d1421 Question #38817 Question #d115b Question #65e63 Question #38dbb Question #78c82 Which molecule contains a triple bond ? A) HCN B) F2 C) O3 D) H2CO How many unpaired electrons are in an atom of Co in its ground state ? A) 7 B) 1 C) 3 D) 2 What is the ground-state electron configuration of Co? The phosphorus atom in PCl3 would be expected to have a ? A) 3+ charge. B) partial negative (-) charge. C) 3- charge. D) partial positive (+) charge. The absorption of light of frequency 1.16 × 1011 Hz is required for CO molecules to go from the lowest rotational energy level to the next highest rotational energy level. Determine the energy for this transition in kJ/mol. h = 6.626 × 10-34 J · s ? Question #0fc5c Question #06d0d Question #bde5e Question #0e196 Question #53adf What is radioactive dating? Question #16468 Question #51925 Question #94615 Question #0f949 Question #c7af8 Question #947fd Question #4c997 Question #7e0de Question #b1587 Question #9b9dd Question #c4a33 Question #a542b Question #7e262 Question #a5269 Which one of the following substances would you expect to have the largest lattice energy (absolute value)? a) CsI b) RbCl c) NaBr d) NaI e) NaF Question #47500 How many valence electrons does sodium have ? Question #7aa96 Question #fd25e How to calculate the effective nuclear charge of the 1s electrons in helium ? Question #3dc17 Question #3c826 Question #d3399 Question #4d616 How are atomic size and electronegativity related? Question #d3185 Question #384ab Question #384cf Question #fec06 Question #a10b3 Question #4910c Microwave radiation has a wavelength on the order of 1.0 cm. Calculate the frequency and the energy of a single photon of this radiation. How to calculate the energy of an Avogadro’s number of photons (called an einstein) of this radiation ? How many electrons are in the valence shells of (a) Be in BeCl2 (b) B in BCl3 (c) H in H2O ? An FM radio station broadcasts at 99.5 MHz. How to Calculate the wavelength of the corresponding radio waves ? What does it mean by the frequency of electromagnetic radiation? Is the frequency the same as the speed of the electromagnetic radiation? How to figure out whether a bond is more ionic than covalent? Question #d9f36 Question #73a30 Question #e5afc Question #190a0 Question #016f5 Question #47bda Question #df0e2 Question #bffb8 Question #ca3af Question #fa6d4 Question #fa5ff Question #5bc68 Question #e4203 Question #1e138 Why do EDTA titrations work best in neutral conditions? Question #f851c Question #faad4 Question #3e282 Question #3eefa Define a dipole moment? Question #54a1d Which property of light waves specifies the color of light? Which is related to the energy of light? How to compare the formal charge and oxidation number of the chlorine atom in the chlorate ion ? # # Which one of the following sets of quantum numbers (l and ml) corresponds to the orbital with the highest energy in the n = 3 shell? The probability envelope for an electron is called? Question #1b7af Question #3ee2b Question #d08c7 Question #d03e8 Question #56768 Question #f5126 N has a mass of 26.19 H has a mass of 8.39 g and Cl has a mass of 65.42. Find the emperical formula? N has a mass of 26.19g H has a mass of 8.39g Cl has a mass of 65.42g mole for N is 26.19/14=1.87, mole for H is 8.39/1=8.39 mole for Cl is 65.42/35.5=1.84. Mole ratio for N is 1.87/1.84 is 1, H is 4.55 and for Cl is 1.What is the empirical formula? Question #3ccdf What is the structural formula of CaCO3? Question #751eb Question #60542 What are the mole fraction and the mole percent of oxygen in exhaled air if P (subscript of O2) is 116 torr and P ( subscript total) is 788 torr? Question #23703 Question #100da Is this reaction likely to be spontaneous? 2Li(s) + 2H2O(g) ----> 2LiOH(s) + H2(g) ΔH = -222 kJ Question #08737 Question #21639 Question #557f1 A 35 degree C sample of a fixed amount of ideal gas occupies 420 mL at a pressure of 1.25atm. What will the volume be at a pressure of 0.900 atm ? Note: The temperature remains constant Considered the reaction: N2(g) + 2NO2(g) for which (delta H) = +67.6KJ. What is the enthalpy change in KJ for the production of 23.0 g NO2? When nitrogen gas reacts with hydrogen gas to form ammonia, 92.38 KJ of heat are given off for each mole of nitrogen gas consumed, under constant pressure and standard conditions. What is the value of H degree for the reverse of the reaction shown.? Write a balance equation for the combustion of isoprene, C5H8, in an abundant supply of oxygen? How to write a balance chemical equation for the reaction of molecular oxygen with radium metal to form oxide? Question #23a9b Question #6d5c3 Question #67926 A calorimeter temperature increases by 0.45 °C when 30 J of energy is added to it by electrical heating. When 0.10 grams of HCl is neutralized in the same calorimeter, the temperature increased by 7.3 °C. What is the ΔH of neutralization of HCl in unit? Question #0bb8e Question #09976 A chemist isolated a gas in a glass bulb with a volume of 255 mL at a temperature of 25.0 degree C and a pressure ( in the bulb ) of 10.0 torr. The gas weighed 12.1 mg. What is the molar mass of this gas? The form of electromagnetic radiation that has more energy per photon than ultraviolet rays but less energy per photon than gamma rays is ? a) microwaves b) radio waves c) X-rays Indicate which of the following photons can cause emission of photoelectrons from the surface of gallium ( 6.7 × 10–19 J)? A) 300 nm B) 400 nm C) What is the frequency of the photons emitted by a He-Ne laser with a wavelength of 632.8 nm? Question #1894b Question #66e6e Question #65e25 10.0g of a metal, initially at 25 Celsius, are placed into 10.0 g of water, initially at 100 Celsius. Which metal will have the lowest final temperature? A) Aluminium (0.902 J/g*Celsius) B) Gold (0.129 J/g* Celsius) C) Copper (0.385 J/g*Cesius) Question #da032 Write a balanced chemical equation for the complete combustion (in the presence of excess oxygen) of: How do you start? (a) C12H26 (a component of kerosene) (b) Enter chemical equations for the reaction of oxygen with the following. All reactions form solid oxides. Include physical states in your answers. Use minimal integer numbers for coefficient inputs (a) zinc (b) aluminum How would I start a question like? Question #81af3 Question #0bb61 Question #16c0c Where does the factor of 4 come from in the Lennard-Jones potential? I had a class assignment to make handmade soap with used cooking oil and i used 55g of NaOH but now i don't know the pH of the soap i made so i'm not sure if its safe enough to use your skin? 0.85 g of solid sodium hydroxide is dissolved and titrated against 0.525 M hydrochloric acid. The titre is 37.00 ml. What is the % purity of the sodium hydroxide ? How can I use Excel to create a graph with two vertical axes? The maximum energy that a hydrogen atom can have is 0 J, at which point the electron is essentially removed from the atom; thus ionization occurs. How much energy ( in joules ) does it take to ionize a hydrogen atom? What wavelength to ionize a hydrogen? Question #8e3b0 Use Rydberg equation to identify the transition. The Lyman hydrogen solar emission line is at 121.58nm corresponds to an electron dropping to n final of 1. What is the initial n value? What volume in liters does 1.67 g of N2 occupy at 22.0 degree C and 756 torr? A sample of carbon dioxide has a volume of 26.5 mL at 20 degree C and 624 torr. How many grams of CO2 are in the sample? Question #dc2ee Question #46cd2 Question #edffb Question #b275b Question #7d207 Question #373eb Question #f9d91 Question #3a132 In calculations, do the molar masses of diatomic elements ever need to be doubled to account for this? Question #52745 A sample of helium at a pressure of 745 torr and in a volume of 2.58 L was heated from 24.0 to 75.0 degree C. The volume of the container expended to 2.81 L. What was the final pressure (in torr) of the helium? A sample of argon with a volume of 6.18 L, a pressure of 761 torr, and a temperature of 20.0 degree C expended to a volume of 9.45 L and a pressure of 373 torr. What was its final temperature in degree C? Question #34e3f For the following reaction: BaO+H2SO4--> BaSO4 +H2O;(Assume that the other reactant is in excess) a) How much BaSO4 can be formed from 196 g of H2SO4 b) If 81 g of water is formed during this reaction, how much BaO was used? A sample of nitrogen has a volume of 880 mL and a pressure of 740 torr. What pressure will change the volume to 550 mL at the same temperature? A balloon has a volume of 2.50 L indoors at 22 degree C. If the balloon is taken outdoors on a cold day when the air temperature is -15 degree C (5 degree F), what will its volume be in liters? Assume constant air pressure within the balloon. A 50.0 g piece of metal at 100.0 degree C was plunged into 100.0 g of water at 24.0 degree C. The temperature of the resulting mixture became 28.0 degree C. (a) How many joules did the water absorbs (b) How many joules did the metal lose? Question #617e4 Question #83f42 Sometimes the magnesium is polished to remove any white film on its surface before beginning the experiment? Question #1068b Question #7b466 Question #107ef Question #875f5 Question #669a2 Question #512c2 What mass (in g) of NaCl is needed to prepare 1.5 L of a 3.0 M salt water solution? Question #0e1aa If you have 12 mol FeCl3 and 12 mol O2, which would be the limiting reactant? (The equation is 4 FeCl3 + 3 O2 Õ 2 Fe2O3 + 6 Cl2) How can a paperclip float on the surface of water? Question #7bff0 Question #278d7 Question #265a5 How to calculate the energy, in joules, of a photon of wavelength 5.00*10^4 nm ? The wavelength of the green light from a traffic signal is centred at 522 nm. What is the frequency, v, in Hz, of this radiation? How to calculate the de Broglie wavelength, in nm, of a baseball with m = 200 g and u = 30 m/s ? Question #fb599 Question #20c86 Question #7607c Question #83b03 Question #80eb4 Question #fc613 Question #3c7b2 Question #fb723 Question #fa3e0 Question #58654 Question #6e502 Question #54f3b Question #f7444 Question #e9294 Question #0bdcb Question #97721 Question #95b9f Question #c7600 Question #70cb1 Question #9c641 Question #bf504 Question #53708 Question #c4e56 Question #f4a58 What is the compound formed between hydrogen and fluorine? You have 250.0 mL of 4.00 M sugar solution. You add 300.0 mL of water to this solution. What is the concentration of the sugar solution after the water has been added? a) 3.33 M b) 1.82 M c)1.54 M d) 2.00 M e) 2.18 M Question #7de66 Question #6cb37 Question #2dd2a Question #5a468 Question #79317 Question #6bd8b Question #0332a Why does Ti(OH)4 decompose into TiO2 and H2O? What are the rules for writing a decomposition reaction Question #021a1 Question #2f07a How do you account for the structures of sodium chloride and hydrated copper(II) sulfate ? Question #01ad0 An 11.2 litre cylinder contains oxygen gas at STP. Assuming that oxygen behaves ideally at STP, how many molecules are there in the cylinder ? Question #7ad1a Question #2babe Question #fe38a Question #8deee Question #a36c9 Question #36b23 A gas at 69°C occupies a volume of 0.67 L. At what Celsius temperature will the volume increase to 1.86 L? Question #74993 Question #d4f18 Using phenolphtalein, how can I identify if the unknown acid is HCl, H2SO4 or H3PO4? I can only use NaOH with the reactions. I know each above acid with NaOH would result in H2O and salt. How do temperature and pressure work in le Chatelier's principle? Determine the number of potassium ions in a 3.05 moles of K+? What is the approximate pH range for a butter containing equimolar amount of KH2PO4 and K2HPO4? Question #7a5a8 Question #51884 Question #c0ca5 Why do #Cu^+# , #Fe^(3+)# and #Mn^(2+)# have colored solutions despite having half filled and full filled d orbitals? Question #37064 Question #c0d99 Question #d29dc Question #4f3fd Question #465e4 A volume of saline solution weighed 25.6 g at 4 degrees C. An equal volume of water at the same temperature weighed 24.5 g. what is the density of the saline solution? Question #7f183 Question #7963f Question #c8a12 10.0mL of 0.505 M NH3 was mixed with 15 mL of 0.487 M NH4Cl. Calculate the pH of the buffer? Question #d0030 When dew forms on grass overnight, which of the following statements is true? A) The process is accompanied by an increase in temperature B) The process is accompanied by a drop in temperature ? Question #adc0d Question #ccbc4 Question #7af19 Question #aa6dc Question #741d4 Question #aceaa Which one of the following represents an element in its standard state at 25°C and 1 atm? A) Fe(l) B)Br2 (l) The valve connecting a 2.00 L bulb containing N2 at 530 torr and a 3.00 L bulb containing O2 at 195 torr is opened. After equilibration what is the total pressure, in atm, in the system? Question #a94b4 Question #aa108 Question #45dbb Question #b5e26 Question #ab299 Question #6f515 Question #c93cd Question #46005 Question #45d04 Question #a9e00 Question #6f55c The ionisation energy of gold is 890.1 kJ/mol. Is light with a wavelength of 225 nm capable of ionising a gold atom ? Question #d8265 Which one of the following cannot be an empirical formula? c) C2H4O d) C2H4O2 Question #65ab1 Question #b8da8 Question #1d652 Question #94f73 Question #1dd50 Question #1cf32 What is the pH of a solution made by mixing 22.96 mL of 0.5478 M Nitric acid is titrated with 36.35 mL of 0.2457 M Potassium hydroxide? I have the answer key for this but I need a walkthrough. The balanced equation for calcium carbonate into lime is: CaCO3 + heat ----> CaO + CO2 How many grams of calcium carbonate must be decomposed to produce 5.0 L of carbon dioxide gas at STP? Question #14f62 Question #1cc27 Which of the entities have higher atomic radius? a) Ca, Ca2+ b) S, S2-. Please explain it? I need help with lewis diagram of HCN - which one do I put in the middle? Question #9d519 Question #6fe73 Question #031e5 Question #dde8e Question #eeed1 Question #61c7e Question #d6d7b Question #fd9f0 Question #5e962 Question #6e1c7 Question #12855 Question #4d8bf Question #c4b42 Question #d985a Question #5a99f Question #56117 How do you calculate the frequency for the electron transition for n = 4 to n = 3 in the hydrogen atom ? What was the Mendeleev's periodic law? Explain. Question #b0544 Question #e1c97 Question #f392f Question #ec956 Question #1223f Question #14f9a Question #8db4a Question #66af4 Question #20e7d Question #0f4eb Question #8d28b Question #6a166 Question #ad0f4 Can you write a synthesis reaction with 3 reactants on one side with a single product on the other (e.g., A + B + C Õ ABC)? Question #68e98 Question #ee18a Question #8d9d7 Question #a13a9 Question #6dcaa Question #903dd Question #f7898 Question #ac19d Question #72a06 Question #65a84 Question #3c6cb Question #56a7c Question #54d68 Question #923ff Question #70479 Question #a552b Question #6de74 Question #d8c25 Question #d511f Question #a5c4b Question #d8903 Question #a8154 For the reaction: 4 NO2 (g) + O2 (g) 2 N2O5 (g) a) What is the rate of formation of N2O5 in terms of the rate of disappearance of O2? b) If the rate of disappearance of O2 = 0.0037 mol L-1s-1 what is the rate of disappearance of NO2? Question #cdec4 Question #f6f13 Question #19e5c Question #9cb6f Question #4f01f What is an example of a rate law practice problem? How can the rate law be determined? Question #bbab6 Question #bb9cd Question #1a09a Question #9d340 Question #c7db1 Question #dc681 Question #5f692 Question #65918 Question #6adf8 Question #a2290 Question #00db2 Question #f674b Question #44320 Question #407c8 Question #68410 Question #e3c3f Question #e331a Question #26208 Question #ac6f9 Question #7c852 Question #92f9f Question #11a90 Question #babed Question #ddf2d Question #09dee Question #f421c Question #18930 Question #094e3 Question #42269 Question #8c06a Question #03b01 Question #dc117 Question #3d676 If carbon has a versatile nature of combing with atoms of different elements then why it is present in such meagre amounts in the earths crust and atmosphere? Question #500ec Question #f1edc Why does the octet rule exist? Question #6a833 Question #1b4ec Question #531af Question #88612 Question #bb37f Question #9c6b9 Question #02852 Question #c7281 Question #3b08f Question #25845 Question #25fad Question #103ea Question #d20d9 Question #9d392 Question #ab7d6 Question #22d59 Question #b1cfc Question #eb856 Question #89cd6 Question #95adf Question #0f5dc Question #5f1ff Question #22228 Question #aea80 Question #cb377 Question #2914e Question #c22fc Question #c9c99 How is lanthanum phosphate formed - what exactly happen on the valance energy level and the final octet? Question #6dce3 What is osmotic pressure? What is isosmotic? What is hyposmotic? Question #1808a Question #85cb9 What does The 3rd Law of Thermodynamics tell us ? Question #c826e Question #c49a8 Question #f1340 Question #b59e7 Question #1a6a4 Question #86975 Question #d70c6 Question #00929 Question #32ae2 Question #85760 Question #1423e Question #21f5c Question #f1fda Question #00b3f Question #b0482 Which scientist gave the modern periodic table? Question #b7b17 Question #20e32 Question #11616 Question #110b3 Question #4f27f Question #95710 Question #dc4f0 Question #3a0eb Question #6c424 Question #dec43 Question #a203b What does electronegativity have to do with bond polarity? Question #8a67e Question #6b054 Question #383ad Question #8b63a Question #1ee43 Question #15a2a Question #38cbd Question #3c995 Question #a1ece What are isotones? Question #d6b18 Question #4b70a Question #3f39b Question #b673d Question #369a9 Why is thermochemistry important? Question #9b2bd Question #f0a6b Question #dfb5d Question #b736b Question #b4d26 Question #b7379 Question #3ec22 Question #dea8a Question #240be Question #a34b2 Question #2341f Question #df3c0 Question #587a9 Question #30c50 Question #c79b7 Question #57f85 Question #b9238 Question #35421 A binary compound formed between sulfur and fluorine contains 25.24% S and 74.76% F by mass. The #sf(M_r)# is 254.1. What is the molecular formula ? Question #f22b7 Question #7ec24 Question #903a5 Question #91006 Question #fae98 Question #d5f2f Question #d5c58 Question #de74c Question #ed4ee Question #e768a Question #72ce1 What are delocalized electrons? Question #59b63 Question #62307 Question #f2147 Question #806de Question #bf67e Question #84bfd Question #3298c Question #f6ebb Question #85335 Question #c6221 Question #d2d86 Question #1a9a9 Question #82b1f Question #8855a Question #2be0c Question #3548c Question #b4a20 Question #ab78d Question #bad6b Question #7679d Question #eef4e Question #391c1 Question #7881f Question #6f323 Question #391d2 Question #fbdfb Question #3973b Question #57ca8 Question #58814 Question #017a3 Question #232b7 Question #e293b Question #ea3d3 Question #8b920 Question #df798 Question #fa220 Question #76d43 Question #3caa3 Question #3046a Question #30c09 Question #10cd1 Question #b8578 Question #783f3 Question #89fdb What does 6mmol/l mean in blood glucose ? Question #369c9 Question #7db35 Question #b7bf5 #sf(""^24Na)# undergoes #beta# decay. A 208g sample decays such that 13g remain. What is the 1/2 life ? Question #95a57 Question #341a6 Question #2a118 Question #6e3aa Question #d6f85 Question #226e3 Question #59965 Question #2a147 Question #2257e Is carbon a diatomic element? What is the law of mass action? What determines the direction of a chemical reaction in a formula equation? Question #20043 Question #7da73 Question #fdbd8 Question #f79ad Question #e05d5 Question #e1d38 Question #71b30 Question #71b91 Question #b3857 Question #f8643 Question #d10a6 Question #f9cf0 Is the dissolution of sodium chloride in water a physical or chemical change? Question #6e4c2 Question #14096 Question #d0daf Question #1bf3e Question #2de95 Question #318ab Question #8ca2b Question #733c7 Question #8a6f9 Question #595b8 Question #1d4a9 Question #432b8 Question #2a4cc Question #597fc Question #4056c Question #2cb81 Why do the properties of elements change in regular pattern across a period? Question #4f49b Question #18399 Question #1b704 How many moles are there in 4.25x10(23) atoms of Au? Is it 4.25x10(23) x I mol Au/6.022x10(23) = 0.71 mols Did I do that correctly? Question #3808d Question #4edfe How many #sigma# bonds are in sodium chloride ? Question #4bb1f Question #7b8b7 Question #657d2 Question #1f5b8 Question #21abd Question #1d148 Question #3063a Question #4edb4 Question #463ef Question #2f4bb Question #06fb4 Question #6a234 Question #19ae7 How to determine the wavelength and frequency of electromagnetic radiation? Question #6d5e0 Question #b7e7e Question #5ecbd Question #39757 Question #69e1e Question #0b65e Question #68927 Question #68e00 Question #60102 Question #b7f80 Question #51278 Question #f4af1 Question #80f21 Question #c6ee4 Question #f3e65 Question #b69fa How can I find the molecular formula from molar mass? Question #b5738 Question #1f393 Question #c4119 Question #6af37 Question #84bc6 Question #faf46 Question #add40 What is the theoretical yield of sodium chloride for the reaction of 36.0 g Na with 75.2 g Cl2 of the following 2NA+Cl2---> 2NaCl? I keep getting stuck with my conversions. I started with 36.0g NA (1 mol Na/22.99g Na) (1 mol Cl2/2mol Na) =0.782 mol Cl2. Question #0b789 Question #92c3e Question #0be20 Question #a641d Question #b7488 What is the valence electron configuration for calcium? Question #579b0 Question #6036b Question #2ba47 Question #39dc1 How do you handle significant figures in multi-step calculations? Question #f11a4 Question #b2485 Question #63a28 Question #07d27 Question #f2f03 Question #805bb Question #8a259 Question #7f0d8 Question #a8ecf Question #a8eab Question #260db Question #e7b7f What is the density of 25 mL, 0.10 M sucrose solution? I divided 342.18g (C12H22O11)/ 25mL. Did I do this correctly or no? Question #2997d Question #21c74 Question #442ba Question #b7480 Question #9d04a Question #1fbd9 Question #e729b Question #83d9a Question #a8f00 Question #e5ff9 Question #e5d1b Question #5613f Question #f19f2 Question #49cb1 Question #5c03c Question #5c044 Question #0e981 Question #99a62 Question #ef2be How does enthalpy affect solubility? Question #6efdf Question #ae59b Question #633f3 Question #83583 Question #00a60 Question #68561 Question #23cdd Question #91f08 What volume of 5M sulfuric acid is required to neutralise 575 ml of 4.1 M potassium hydroxide solution ? Question #2a41e What is the ionic bond formation sodium chloride? Question #8aa82 Question #d708e Question #fc03a Question #f6f94 Question #e896b Question #a146b Question #104c0 Question #e3756 Question #7ade8 Question #0ec01 How do ionic bonds conduct electricity? Question #36243 Question #a47f7 How do you draw and label potential energy diagrams? What is the ionic bond formation of magnesium chloride? Can anyone point me towards some helpful videos where balancing chemical formulas are shown and explained? Question #c83fd Question #f3682 Question #7fac4 How do molecular compounds bond? Question #b1714 Question #078bc Question #cf12d Question #b713f Question #aa1e0 Question #fcfa6 Question #14541 Question #d8eff Question #f9b11 Question #c745e Question #fa647 Question #feca2 Question #0b10d Question #98694 How do we use stable isotopes in science? Question #afd71 Question #165c4 Question #32a13 Question #e7b58 Question #183cf Ratio of Cp and Cv of a gas 'X' is 1.4. Calculate the number of atoms of the gas present in 11.2 liters of it at NTP? How do you balance equations with hydrates? Question #ff599 Question #477b7 Question #0cc51 Question #0fd4b Question #9adde How is the law of definite composition related to the law of multiple proportions? Question #e9c26 Question #8926e Question #b1fb2 Question #8b75f Question #31fed Question #a4616 What is double bonding? Question #2f835 What is the neutralization reaction with the combination H3BO3 and BaOH? Question #d89db If endergonic reactions are not spontaneous, how do they occur? Why is it impossible to predict exactly where an electron is at a given moment? Question #e1386 Question #1b3b2 Question #e182b Question #a5f9b How do you draw the lewis structure for carbon monoxide, or CO? Question #2a028 Question #1d079 Question #a19e0 Question #779c9 Question #f8cc0 Question #798aa Question #1c5e3 Is a molecule the same as a compound? Question #8fb34 Question #159f6 Question #98c48 What is the difference between an atom and an element? Question #7359c Question #b768d Question #ccf13 Question #74ee0 Question #e8020 How do gas laws affect hot air balloons? Question #8d233 Question #04cc4 What is the valence electron configuration for chlorine? Question #3a5ca Question #acf46 Question #bc1f7 Question #25589 ΔHoreaction=∑ΔHof(products)−∑ΔHof(Reactants) --> What exactly is happening in this equation? Question #58475 Question #7574c Question #1c7c8 Question #7dcf9 Question #f8633 How many valence electrons would an element with the atomic number 113 have? Question #cb003 How do you calculate the Gibbs Free Energy change of a reaction? Question #30788 Question #fcfcd Question #b749e Question #64fe5 Question #1d888 Question #42e19 Question #0b631 Question #6e52b Question #b5931 Question #94985 Question #65c13 Question #9aec7 Question #ad7e1 Question #d92c6 Question #ad39f Question #c7420 Question #1e06a Question #f9082 Question #f7c07 Question #a19db Question #27103 Question #fea7c Question #e486b Question #1aff0 Question #ab82c Question #96d44 Question #7add1 Question #bf5b6 Question #a20b0 Question #92ebe Question #d4bcc Question #13f80 Question #555cb Question #b7af7 Question #5d452 Question #ddb73 Question #da257 Question #8c472 Question #b6c73 How do you graph Charle's law? Question #5496b Are alkyl groups and radicals the same? For example aldehydes R-CHO. Question #13970 Question #1355e Question #788a6 Question #60254 Question #0f395 Question #a4307 Question #37f38 Question #f5110 Question #98caf Question #158f3 Question #e2e6a How can a balanced chemical equation be used to write an equilibrium-constant expression? How does atomic size change within groups? How do oxidation numbers relate to bonding? How do valence electrons affect living organisms? What is the ionic compound name for cacl2? How do the names of ionic compounds differ from covalent compounds? What is the ionic formula for magnesium oxide? What periodic table family is hydrogen in? What is the s,p,d,f configuration of barium? How does metallic bonding account for malleability? How do you find density in the ideal gas law? Question #3e2ee Question #d5d29 Question #7c574 Question #f7b80 Question #a8d99 Question #2f9a7 Question #a37af 0.10 mol of solid sodium hydrogen carbonate and 0.20 mol of solid sodium carbonate are dissolved in the same beaker of water, transferred to a volumetric flask and made to 250.0 mL. The Ka for HCO3 - is 4.7 x 10-11. What is the pH of the resulting buer? Question #40e4a What is the valence electron configuration for sodium? How do you use stoichiometry to convert mass to moles? What is the valence electron configuration for carbon? What is the valence electron configuration for halogens? What is the ionic compound name for #O_2#? What is the octet rule of sulfur? What is the octet rule of carbon? What is the octet rule of oxygen? What is the exception to the octet rule with aluminum? What is the s,p,d,f configuration of potassium? Question #86d62 Question #8c016 Question #1b7a2 A red ball is thrown downward with an initial speed of 10 m/s at time t = 0 from a vertical height of 80 m above the ground. At time t = 2 s later, a green ball is thrown vertically upward from the ground with an initial speed of 30 m/s. At what height above the ground do these objects pass each other, if possible? How do you write an ionic formula given an anion and a cation? Question #bf98d Why is carbon chemistry so varied? How can the octet rule be violated? What are the exceptions to octet rule with odd number electrons? How is the octet rule used in covalent bonding? How do you calculate the number of moles from concentration? What are the different formulas that define a mole? When does covalent bonding occur? How do you draw the lewis structure for ph3? What is the bond polarity of h2o? What balanced equation represents a redox reaction? How is the periodic table arranged? How is ideal gas law derived? How is vsepr used to classify molecules? What is the ideal gas law constant? Question #d5d23 Question #480ff Question #c88fc Question #c8bc6 Question #f8480 Question #496da Question #04458 A salt solution has a concentration of 2.4%w/v. What is the concentration if 10.0 mL of this solution is diluted to a total volume of 60.0 mL? Question #a926e What covalent bonds are in sulfamic acid and water? Question #f6476 Question #3c8f0 Question #f7c86 Question #14194 Question #531fb Question #f6b61 Question #bbb64 Question #a2203 Question #f0968 Question #8852c Question #ddc52 Question #cf6fa Question #7580c Question #c16fb Question #8153f Question #477c5 Question #d8f0a Question #b267f Question #b0916 Question #5a652 Question #7b4e4 Question #bf3dc Question #ccd7d Question #a6569 Question #a53c0 Question #6f8e9 Question #4fed1 Question #b93ef Question #c3d89 Question #5563e Question #921da How do you measure concentration of salt in water? Question #08b63 Question #e1f0a Question #0bd3b Question #aee14 Question #9e8d3 Question #058ed How do covalent bonds conduct electricity? Question #08a1c How do you calculate mole fractions? Question #db3dc Question #e47b0 Question #c6fd9 Question #40e06 Question #e462b Question #daeaa Question #bf5bf Question #59cff Question #bce2a Question #c7855 How many polar bonds are in hydronium? How many polar bonds are in levonorgestrel? What is the exception to the octet rule with sulfur? What is the valence electron configuration for neon? What is the Charles's law equation?

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