Question 1

In which of the following pairs is the oxidation number for the underlined element INCORRECT?

Accepted Answer

A)  ClO4-/(+7) 
B)  S2O32-/+2 
C)  Fe2O3/+3 
D)  HCO3-/+3 
E)  CO2/+4 
A)  ClO4-/(+7) 
B)  S2O32-/+2 
C)  Fe2O3/+3 
D)  HCO3-/+3 
E)  CO2/+4

Question 2

Balance the following equation for an oxidation-reduction reaction occurring in an acidic solution: HCl + H2C2O4 + MnO2(s) → MnCl2 + CO2(g) + H2O
The sum of the coefficients is ________.

Accepted Answer

A)  7 
B)  15 
C)  45 
D)  12 
E)  9 
A)  7 
B)  15 
C)  45 
D)  12 
E)  9

Question 3

Balance the following equation for an oxidation-reduction reaction occurring in an acidic solution: ClO4- + SO32- → SO42- + Cl-
The sum of the coefficients is ________.

Accepted Answer

A)  8 
B)  12 
C)  10 
D)  4 
E)  6 
A)  8 
B)  12 
C)  10 
D)  4 
E)  6

Question 4

Which of the following solutions has the lowest concentration of sulfate ion?

Accepted Answer

A)  0.1 M Al2(SO4)3 
B)  0.2 M MgSO4 
C)  0.3 M Li2SO4 
D)  0.4 M K2SO4 
E)  0.5 M CuSO4 
A)  0.1 M Al2(SO4)3 
B)  0.2 M MgSO4 
C)  0.3 M Li2SO4 
D)  0.4 M K2SO4 
E)  0.5 M CuSO4

Question 5

What is the sum of all coefficients in the complete and balanced net equation for the reaction occurring when chlorine gas is bubbled through aqueous sodium hydroxide to form aqueous sodium hypochlorite (NaOCl) and sodium chloride?

Accepted Answer

A)  15 
B)  11 
C)  10 
D)  8 
E)  6 
A)  15 
B)  11 
C)  10 
D)  8 
E)  6

Question 6

Identify the reducing agent in the following reaction: 2 NO2(g) + 7 H2(g) → 2 NH3(g) + 4 H2O(g)

Accepted Answer

A)  NO2 
B)  NH3 
C)  H2O 
D)  H2 
E)  There is no reducing agent. 
A)  NO2 
B)  NH3 
C)  H2O 
D)  H2 
E)  There is no reducing agent.

Question 7

An insoluble compound will dissolve to an appreciable amount in water.

Accepted Answer

A) True 
 B)False

Question 8

Weak acids almost completely dissociate.

Accepted Answer

A) True 
 B)False

Question 9

Balance the following oxidation-reduction reaction in acid solution: SO32- + MnO4- → SO42- + Mn2+ + H2O
The sum of the coefficients is ________.

Accepted Answer

A)  23 
B)  30 
C)  13 
D)  45 
E)  28 
A)  23 
B)  30 
C)  13 
D)  45 
E)  28

Question 10

Iron in the form FeCl2 can be determined by titration with potassium dichromate: 6FeCl2(aq) + K2Cr2O7(aq) + 14HCl(aq) → 6FeCl3(aq) + 2CrCl3(aq) + 2KCl(aq) + 7H2O(l)
An iron sample of mass 0.800 g required 18.80 mL of 0.0120 M K2Cr2O7(aq) to reach the end point. How many moles of FeCl2 were in the sample?

Accepted Answer

A)  1.43 × 10-2 mol 
B)  1.35 × 10-3 mol 
C)  3.75 × 10-5 mol 
D)  2.26 × 10-4 mol 
E)  1.13 × 10-4 mol 
A)  1.43 × 10-2 mol 
B)  1.35 × 10-3 mol 
C)  3.75 × 10-5 mol 
D)  2.26 × 10-4 mol 
E)  1.13 × 10-4 mol

Question 11

Write the net ionic equation for the reaction of ammonium chloride and potassium hydroxide.

Accepted Answer

A)  NH4Cl(aq) + KOH(aq) → NH3(aq) + KCl(aq) + H2O 
B)  NH+4 + OH- → NH3(aq) + H2O 
C)  NH4Cl(aq) + OH- → NH3(aq) + Cl- + H2O 
D)  NH+4 + KOH → NH4OH(aq) + K+ 
E)  no reaction 
A)  NH4Cl(aq) + KOH(aq) → NH3(aq) + KCl(aq) + H2O 
B)  NH+4 + OH- → NH3(aq) + H2O 
C)  NH4Cl(aq) + OH- → NH3(aq) + Cl- + H2O 
D)  NH+4 + KOH → NH4OH(aq) + K+ 
E)  no reaction

Question 12

What is the proper coefficient for water when the following equation is completed and balanced for the reaction in basic solution? C2O42- (aq) + MnO4- (aq) → CO32- (aq) + MnO2(s)

Accepted Answer

A)  4 
B)  3 
C)  2 
D)  1 
E)  0 
A)  4 
B)  3 
C)  2 
D)  1 
E)  0

Question 13

The substance NaOH in water solution is a:

Accepted Answer

A)  nonelectrolyte 
B)  weak electrolyte 
C)  weak base 
D)  strong electrolyte 
E)  weak acid 
A)  nonelectrolyte 
B)  weak electrolyte 
C)  weak base 
D)  strong electrolyte 
E)  weak acid

Question 14

Choose the INCORRECT statement.

Accepted Answer

A)  A base produces hydrogen ions in solution. 
B)  A strong acid is a strong electrolyte. 
C)  Weak acids are weak electrolytes. 
D)  In a neutralization reaction, an acid reacts with a base. 
E)  Acids contain ionizable hydrogens. 
A)  A base produces hydrogen ions in solution. 
B)  A strong acid is a strong electrolyte. 
C)  Weak acids are weak electrolytes. 
D)  In a neutralization reaction, an acid reacts with a base. 
E)  Acids contain ionizable hydrogens.

Question 15

Which statement below best describes net ionic equations?

Accepted Answer

A)  A net ionic equation lists all ions in the solution. 
B)  A net ionic equation is obtained when the ions forming the precipitate are removed from the molecular equation. 
C)  A net ionic equation is a balanced chemical equation that includes only ions that actually participate in a reaction. 
D)  A net ionic equation is a balanced chemical equation that includes all the ions present in a reaction mixture. 
E)  A net ionic reaction is a balanced chemical equation that clearly shows spectator ions in a reaction. 
A)  A net ionic equation lists all ions in the solution. 
B)  A net ionic equation is obtained when the ions forming the precipitate are removed from the molecular equation. 
C)  A net ionic equation is a balanced chemical equation that includes only ions that actually participate in a reaction. 
D)  A net ionic equation is a balanced chemical equation that includes all the ions present in a reaction mixture. 
E)  A net ionic reaction is a balanced chemical equation that clearly shows spectator ions in a reaction.

Question 16

Balance the following oxidation-reduction reaction in acid solution: Fe(s) → Fe2+ + H2(g)
The sum of the coefficients is ________.

Accepted Answer

A)  2 
B)  5 
C)  8 
D)  7 
E)  9 
A)  2 
B)  5 
C)  8 
D)  7 
E)  9

Question 17

What volume of 0.110 M , H2SO4 is required to exactly neutralize 10.0 mL of 0.085 M NaOH?

Accepted Answer

A)  7.7 mL 
B)  1.9 mL 
C)  0.39 mL 
D)  3.9 mL 
E)  0.19 mL 
A)  7.7 mL 
B)  1.9 mL 
C)  0.39 mL 
D)  3.9 mL 
E)  0.19 mL

Question 18

Complete the equation and indicate if a precipitate forms. Na+ + OH- + Mg2+ + Cl- →

Accepted Answer

A)  NaCl(s) + Mg2+ + 2 OH- 
B)  Mg(OH)2(s) + Na+ + Cl- 
C)  MgCl2(s) + Na+ + OH- 
D)  MgCl2(s) + Na(OH)(s) 
E)  no reaction 
A)  NaCl(s) + Mg2+ + 2 OH- 
B)  Mg(OH)2(s) + Na+ + Cl- 
C)  MgCl2(s) + Na+ + OH- 
D)  MgCl2(s) + Na(OH)(s) 
E)  no reaction

Question 19

A solution is 0.20 M Ba(OH)2. How many moles of H+ must be added to neutralize 100.0 mL of the solution?

Accepted Answer

A)  0.020 mol 
B)  0.080 mol 
C)  0.040 mol 
D)  0.40 mol 
E)  0.80 mol 
A)  0.020 mol 
B)  0.080 mol 
C)  0.040 mol 
D)  0.40 mol 
E)  0.80 mol

Question 20

Which of the following pairs react to give both a precipitation and a neutralization reaction?

Accepted Answer

A)  Ca(OH)2(aq) and H2SO4(aq) 
B)  Mg(OH)2(aq) and H2SO4(aq) 
C)  Sr(OH)2(aq) and HNO3(aq) 
D)  Ba(OH)2(aq) and HNO3(aq) 
A)  Ca(OH)2(aq) and H2SO4(aq) 
B)  Mg(OH)2(aq) and H2SO4(aq) 
C)  Sr(OH)2(aq) and HNO3(aq) 
D)  Ba(OH)2(aq) and HNO3(aq)

Exam 5: Introduction to Reactions in Aqueous Solutions

In which of the following pairs is the oxidation number for the underlined element INCORRECT?

Balance the following equation for an oxidation-reduction reaction occurring in an acidic solution: HCl + H2C2O4 + MnO2(s) → MnCl2 + CO2(g) + H2O The sum of the coefficients is ________.

Balance the following equation for an oxidation-reduction reaction occurring in an acidic solution: ClO4- + SO32- → SO42- + Cl- The sum of the coefficients is ________.

Which of the following solutions has the lowest concentration of sulfate ion?

What is the sum of all coefficients in the complete and balanced net equation for the reaction occurring when chlorine gas is bubbled through aqueous sodium hydroxide to form aqueous sodium hypochlorite (NaOCl) and sodium chloride?

Identify the reducing agent in the following reaction: 2 NO2(g) + 7 H2(g) → 2 NH3(g) + 4 H2O(g)

An insoluble compound will dissolve to an appreciable amount in water.

Weak acids almost completely dissociate.

Balance the following oxidation-reduction reaction in acid solution: SO32- + MnO4- → SO42- + Mn2+ + H2O The sum of the coefficients is ________.

Write the net ionic equation for the reaction of ammonium chloride and potassium hydroxide.

What is the proper coefficient for water when the following equation is completed and balanced for the reaction in basic solution? C2O42- (aq) + MnO4- (aq) → CO32- (aq) + MnO2(s)

The substance NaOH in water solution is a:

Choose the INCORRECT statement.

Which statement below best describes net ionic equations?

Balance the following oxidation-reduction reaction in acid solution: Fe(s) → Fe2+ + H2(g) The sum of the coefficients is ________.

What volume of 0.110 M , H2SO4 is required to exactly neutralize 10.0 mL of 0.085 M NaOH?

Complete the equation and indicate if a precipitate forms. Na+ + OH- + Mg2+ + Cl- →

A solution is 0.20 M Ba(OH)2. How many moles of H+ must be added to neutralize 100.0 mL of the solution?

Which of the following pairs react to give both a precipitation and a neutralization reaction?

Matter - Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Compounds

Chemical Reactions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding II: Additional Aspects

Intermolecular Forces: Liquids and Solids

Solutions and Their Physical Properties

Chemical Kinetics

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acid-Base Equilibria

Solubility and Complex-Ion Equilibria

Spontaneous Change: Entropy and Free Energy

Electrochemistry

Main Group Elements I: Groups 1, 2, 13, and 14

Main Group Elements II: Groups 18, 17, 16, 15, and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry 1-41

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

Balance the following equation for an oxidation-reduction reaction occurring in an acidic solution: HCl + H₂C₂O₄ + MnO₂(s) → MnCl₂ + CO₂(g) + H₂O The sum of the coefficients is ________.

Balance the following equation for an oxidation-reduction reaction occurring in an acidic solution: ClO₄^- + SO₃^2- → SO₄^2- + Cl- The sum of the coefficients is ________.

Identify the reducing agent in the following reaction: 2 NO₂(g) + 7 H₂(g) → 2 NH₃(g) + 4 H₂O(g)

Balance the following oxidation-reduction reaction in acid solution: SO₃^2- + MnO₄^- → SO₄^2- + Mn²⁺ + H₂O The sum of the coefficients is ________.

What is the proper coefficient for water when the following equation is completed and balanced for the reaction in basic solution? C₂O₄^2- (aq) + MnO₄^- (aq) → CO₃^2- (aq) + MnO₂(s)

Balance the following oxidation-reduction reaction in acid solution: Fe(s) → Fe²⁺ + H₂(g) The sum of the coefficients is ________.

What volume of 0.110 M , H₂SO₄ is required to exactly neutralize 10.0 mL of 0.085 M NaOH?

Complete the equation and indicate if a precipitate forms. Na⁺ + OH- + Mg²⁺ + Cl- →

A solution is 0.20 M Ba(OH)₂. How many moles of H+ must be added to neutralize 100.0 mL of the solution?