Question 1

Covalent compounds, dissolved in water, never produce conducting solutions.

Accepted Answer

A) True 
 B)False

Question 2

The correct method for preparing one liter of a 1.0 M solution of X is to dissolve exactly one mole of X in exactly one liter of water.

Accepted Answer

A) True 
 B)False

Question 3

Select the correct name and chemical formula for the precipitate that forms when the following reactants are mixed. CuCl2(aq) + Na2CO3(aq) →

Accepted Answer

A)  copper(I) carbonate, Cu2CO3 
B)  copper(II) carbonate, Cu2CO3 
C)  copper(I) carbonate, CuCO3 
D)  copper(II) carbonate, CuCO3 
E)  sodium chloride, NaCl 
A)  copper(I) carbonate, Cu2CO3 
B)  copper(II) carbonate, Cu2CO3 
C)  copper(I) carbonate, CuCO3 
D)  copper(II) carbonate, CuCO3 
E)  sodium chloride, NaCl

Question 4

How many moles of ions are released when 0.27 mol of cobalt(II) chloride, CoCl2, is dissolved in water?

Accepted Answer

A)  0.81 mol 
B)  0.54 mol 
C)  0.27 mol 
D)  0.18 mol 
E)  0.090 mol 
A)  0.81 mol 
B)  0.54 mol 
C)  0.27 mol 
D)  0.18 mol 
E)  0.090 mol

Question 5

When 2.61 g of solid Na2CO3 is dissolved in sufficient water to make 250. mL of solution, the concentration of Na2CO3 is:

Accepted Answer

A)  0.0246 M 
B)  10.4 M 
C)  0.205 M 
D)  0.0985 M 
E)  0.141 M 
A)  0.0246 M 
B)  10.4 M 
C)  0.205 M 
D)  0.0985 M 
E)  0.141 M

Question 6

Predict the product(s) for the following reaction. MgCO3(s)

Accepted Answer

A)  MgO2(s) + CO(g) 
B)  MgO(s) + CO2 
C)  Mg(s) + CO2(g) + O2(g) 
D)  Mg2+(s) + CO2(g) + O2(g) 
E)  No reaction occurs. 
A)  MgO2(s) + CO(g) 
B)  MgO(s) + CO2 
C)  Mg(s) + CO2(g) + O2(g) 
D)  Mg2+(s) + CO2(g) + O2(g) 
E)  No reaction occurs.

Question 7

Select the classification for the following reaction. Fe2+(aq) + 2OH-(aq) → Fe(OH)2(s)

Accepted Answer

A)  Precipitation 
B)  Acid-base 
C)  Redox 
D)  Decomposition 
E)  None of these choices are correct. 
A)  Precipitation 
B)  Acid-base 
C)  Redox 
D)  Decomposition 
E)  None of these choices are correct.

Question 8

Select the classification for the following reaction. H2(g) + Cl2(g) → 2HCl(g)

Accepted Answer

A)  Combination 
B)  Decomposition 
C)  Displacement 
D)  Acid-base 
E)  None of these choices are correct. 
A)  Combination 
B)  Decomposition 
C)  Displacement 
D)  Acid-base 
E)  None of these choices are correct.

Question 9

Select the precipitate that forms when the following reactants are mixed. Mg(CH3COO)2(aq) + LiOH(aq) →

Accepted Answer

A)  LiCH3COO 
B)  Li(CH3COO)2 
C)  MgOH 
D)  Mg(OH)2 
E)  CH3OH 
A)  LiCH3COO 
B)  Li(CH3COO)2 
C)  MgOH 
D)  Mg(OH)2 
E)  CH3OH

Question 10

Select the net ionic equation for the reaction between sodium chloride and mercury(I) nitrate. 2NaCl(aq) + Hg2(NO3)2(aq) → 2NaNO3(aq) + Hg2Cl2(s)

Accepted Answer

A)  Na+(aq) + NO3-(aq) → NaNO3(aq) 
B)  Hg22+(aq) + 2Cl-(aq) → Hg2Cl2(s) 
C)  NaCl(aq) → Na+(aq) + Cl-(aq) 
D)  Hg2(NO3)2(aq) → Hg22+(aq) + 2NO3-(aq) 
E)  Hg22+(aq) → Hg2(s) 
A)  Na+(aq) + NO3-(aq) → NaNO3(aq) 
B)  Hg22+(aq) + 2Cl-(aq) → Hg2Cl2(s) 
C)  NaCl(aq) → Na+(aq) + Cl-(aq) 
D)  Hg2(NO3)2(aq) → Hg22+(aq) + 2NO3-(aq) 
E)  Hg22+(aq) → Hg2(s)

Question 11

Reduction is the loss of electrons.

Accepted Answer

A) True 
 B)False

Question 12

Select the classification for the following reaction. CaCl2·H2O(s)   CaCl2(s) + H2O(g)

Accepted Answer

A)  Combination 
B)  Decomposition 
C)  Displacement 
D)  Acid-base 
E)  Precipitation 
A)  Combination 
B)  Decomposition 
C)  Displacement 
D)  Acid-base 
E)  Precipitation

Question 13

Predict the product(s) for the following reaction. Cl2O7(g) + H2O(l) →

Accepted Answer

A)  HClO4(aq) 
B)  H2ClO4(aq) 
C)  H(ClO4)2(aq) 
D)  HCl(aq) + O2(g) 
E)  HClO3(aq) 
A)  HClO4(aq) 
B)  H2ClO4(aq) 
C)  H(ClO4)2(aq) 
D)  HCl(aq) + O2(g) 
E)  HClO3(aq)

Question 14

What volume, in L, of 10.0 M HCl is needed to make 2.00 L of 2.00 M HCl solution by dilution with water?

Accepted Answer

A)  0.800 L 
B)  0.400 L 
C)  0.200 L 
D)  0.100 L 
E)  None of these choices are correct. 
A)  0.800 L 
B)  0.400 L 
C)  0.200 L 
D)  0.100 L 
E)  None of these choices are correct.

Question 15

Which one of the following is a redox reaction?

Accepted Answer

A)  2Na(g) + Cl2(g) → 2NaCl(s) 
B)  Ba2+(aq) + SO42-(aq) → BaSO4(s) 
C)  K2Cr2O7(aq) + 2KOH(aq) → 2K2CrO4(aq) + H2O(l) 
D)  Na2CO3(s) + 2HCl(aq) → 2NaCl(aq) + CO2(g) + H2O(l) 
E)  H2O(l) → H+(aq) + OH-(aq) 
A)  2Na(g) + Cl2(g) → 2NaCl(s) 
B)  Ba2+(aq) + SO42-(aq) → BaSO4(s) 
C)  K2Cr2O7(aq) + 2KOH(aq) → 2K2CrO4(aq) + H2O(l) 
D)  Na2CO3(s) + 2HCl(aq) → 2NaCl(aq) + CO2(g) + H2O(l) 
E)  H2O(l) → H+(aq) + OH-(aq)

Question 16

A standard solution of 0.243 M NaOH was used to determine the concentration of a hydrochloric acid solution. If 46.33 mL of NaOH is needed to neutralize 10.00 mL of the acid, what is the molar concentration of the acid?

Accepted Answer

A)  0.0524 M 
B)  0.888 M 
C)  1.13 M 
D)  2.26 M 
E)  2.43 M 
A)  0.0524 M 
B)  0.888 M 
C)  1.13 M 
D)  2.26 M 
E)  2.43 M

Question 17

Select the classification for the following reaction. 2Ag+(aq) + Zn(s) → 2Ag(s) + Zn2+(aq)

Accepted Answer

A)  Displacement 
B)  Decomposition 
C)  Combination 
D)  Precipitation 
E)  Acid-base 
A)  Displacement 
B)  Decomposition 
C)  Combination 
D)  Precipitation 
E)  Acid-base

Question 18

Which, if any, of the following properties applies to weak acids?

Accepted Answer

A)  They are strong electrolytes. 
B)  They are excellent conductors of electricity. 
C)  When dissolved in water, they do not ionize completely. 
D)  All of these choices are correct. 
E)  None of these choices are correct. 
A)  They are strong electrolytes. 
B)  They are excellent conductors of electricity. 
C)  When dissolved in water, they do not ionize completely. 
D)  All of these choices are correct. 
E)  None of these choices are correct.

Question 19

What will be the final volume of a solution prepared by diluting 25 mL of 8.25 M sodium hydroxide to a concentration of 2.40 M?

Accepted Answer

A)  330 mL 
B)  210 mL 
C)  86 mL 
D)  60 mL 
E)  7.3 mL 
A)  330 mL 
B)  210 mL 
C)  86 mL 
D)  60 mL 
E)  7.3 mL

Question 20

Calculate the oxidation number of the chlorine in perchloric acid, HClO4, a strong oxidizing agent.

Accepted Answer

A)  -1 
B)  +4 
C)  +5 
D)  +7 
E)  None of these choices are correct. 
A)  -1 
B)  +4 
C)  +5 
D)  +7 
E)  None of these choices are correct.

Exam 4: Three Major Classes of Chemical Reactions

Covalent compounds, dissolved in water, never produce conducting solutions.

The correct method for preparing one liter of a 1.0 M solution of X is to dissolve exactly one mole of X in exactly one liter of water.

Select the correct name and chemical formula for the precipitate that forms when the following reactants are mixed. CuCl2(aq) + Na2CO3(aq) →

How many moles of ions are released when 0.27 mol of cobalt(II) chloride, CoCl2, is dissolved in water?

When 2.61 g of solid Na2CO3 is dissolved in sufficient water to make 250. mL of solution, the concentration of Na2CO3 is:

Predict the product(s) for the following reaction. MgCO3(s)

Select the classification for the following reaction. Fe2+(aq) + 2OH-(aq) → Fe(OH)2(s)

Select the classification for the following reaction. H2(g) + Cl2(g) → 2HCl(g)

Select the precipitate that forms when the following reactants are mixed. Mg(CH3COO)2(aq) + LiOH(aq) →

Select the net ionic equation for the reaction between sodium chloride and mercury(I) nitrate. 2NaCl(aq) + Hg2(NO3)2(aq) → 2NaNO3(aq) + Hg2Cl2(s)

Reduction is the loss of electrons.

Select the classification for the following reaction. CaCl2·H2O(s) CaCl2(s) + H2O(g)

Predict the product(s) for the following reaction. Cl2O7(g) + H2O(l) →

What volume, in L, of 10.0 M HCl is needed to make 2.00 L of 2.00 M HCl solution by dilution with water?

Which one of the following is a redox reaction?

A standard solution of 0.243 M NaOH was used to determine the concentration of a hydrochloric acid solution. If 46.33 mL of NaOH is needed to neutralize 10.00 mL of the acid, what is the molar concentration of the acid?

Select the classification for the following reaction. 2Ag+(aq) + Zn(s) → 2Ag(s) + Zn2+(aq)

Which, if any, of the following properties applies to weak acids?

What will be the final volume of a solution prepared by diluting 25 mL of 8.25 M sodium hydroxide to a concentration of 2.40 M?

Calculate the oxidation number of the chlorine in perchloric acid, HClO4, a strong oxidizing agent.

Keys to Studying Chemistry Definitions, Units, and Problem Solving

The Components of Matter

Stoichiometry of Formulas and Equations

Gases and the Kinetic-Molecular Theory

Thermochemistry Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces Liquids, Solids, and Phase Changes

The Properties of Mixtures Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics Rates and Mechanisms of Chemical Reactions

Equilibrium the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics Entropy, Free Energy, and Reaction Direction

Electrochemistry Chemical Change and Electrical Work

The Elements in Nature and Industry

Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Select the correct name and chemical formula for the precipitate that forms when the following reactants are mixed. CuCl₂(aq) + Na₂CO₃(aq) →

How many moles of ions are released when 0.27 mol of cobalt(II) chloride, CoCl₂, is dissolved in water?

When 2.61 g of solid Na₂CO₃ is dissolved in sufficient water to make 250. mL of solution, the concentration of Na₂CO₃ is:

Predict the product(s) for the following reaction. MgCO₃(s)

Select the classification for the following reaction. Fe₂₊(aq) + 2OH_-(aq) → Fe(OH)₂(s)

Select the classification for the following reaction. H₂(g) + Cl₂(g) → 2HCl(g)

Select the precipitate that forms when the following reactants are mixed. Mg(CH₃COO)₂(aq) + LiOH(aq) →

Select the net ionic equation for the reaction between sodium chloride and mercury(I) nitrate. 2NaCl(aq) + Hg₂(NO₃)₂(aq) → 2NaNO₃(aq) + Hg₂Cl₂(s)

Select the classification for the following reaction. CaCl₂·H₂O(s) CaCl₂(s) + H₂O(g)

Predict the product(s) for the following reaction. Cl₂O₇(g) + H₂O(l) →

Select the classification for the following reaction. 2Ag₊(aq) + Zn(s) → 2Ag(s) + Zn₂₊(aq)

Calculate the oxidation number of the chlorine in perchloric acid, HClO₄, a strong oxidizing agent.