Question 1

Oxidation never occurs alone.

Accepted Answer

A) True 
 B)False  True

Question 2

In 0.20 M NH3(aq), the concentration of NH4+(aq) and OH-(aq) are approximately 0.20 M.

Accepted Answer

A) True 
 B)False  False

Question 3

How many electrons are transferred when the perchlorate ion is converted to chloride?

Accepted Answer

A)  8 
B)  7 
C)  9 
D)  6 
E)  5 
A)  8 
B)  7 
C)  9 
D)  6 
E)  5 A

Question 4

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

Accepted Answer

A)  BrO4-/(+7) 
B)  CO32-/+4 
C)  FeO/+2 
D)  IO3-/+5 
E)  Mg(OH)2/+3 
A)  BrO4-/(+7) 
B)  CO32-/+4 
C)  FeO/+2 
D)  IO3-/+5 
E)  Mg(OH)2/+3

Question 5

Which of the following is most likely to be a strong oxidizing agent?

Accepted Answer

A)  MnO 
B)  MnO2 
C)  KMnO4 
D)  Mn2O3 
E)  Mn3O4 
A)  MnO 
B)  MnO2 
C)  KMnO4 
D)  Mn2O3 
E)  Mn3O4

Question 6

The substance HNO2 is a:

Accepted Answer

A)  strong base 
B)  strong acid 
C)  weak acid 
D)  weak base 
E)  salt 
A)  strong base 
B)  strong acid 
C)  weak acid 
D)  weak base 
E)  salt

Question 7

Which of the following reactions is an oxidation-reduction reaction?

Accepted Answer

A)  NH3(g) + H2O(l) → NH4OH(aq) 
B)  HCl(aq) + NaH2PO4(aq) → H3PO4(aq) + NaCl(aq) 
C)  2 H2O(l) → H3O+ (aq) + OH- (aq) 
D)  Mg(OH)2(s) → Mg2+ (aq) + 2 OH- (aq) 
E)  CO(g) + H2O(g) → CO2(g) + H2(g) 
A)  NH3(g) + H2O(l) → NH4OH(aq) 
B)  HCl(aq) + NaH2PO4(aq) → H3PO4(aq) + NaCl(aq) 
C)  2 H2O(l) → H3O+ (aq) + OH- (aq) 
D)  Mg(OH)2(s) → Mg2+ (aq) + 2 OH- (aq) 
E)  CO(g) + H2O(g) → CO2(g) + H2(g)

Question 8

What volume of 0.38 M hydrochloric acid is required for complete neutralization of 15 mL of 0.19 M calcium hydroxide?

Accepted Answer

A)  38 mL 
B)  30 mL 
C)  19 mL 
D)  15 mL 
E)  7.5 mL 
A)  38 mL 
B)  30 mL 
C)  19 mL 
D)  15 mL 
E)  7.5 mL

Question 9

Soluble ionic compounds form strong electrolytes.

Accepted Answer

A) True 
 B)False

Question 10

Balance the following equation in basic solution: Al(s) + O2(g) → [Al(OH)4]-
The sum of the coefficients is ________.

Accepted Answer

A)  6 
B)  12 
C)  21 
D)  25 
E)  33 
A)  6 
B)  12 
C)  21 
D)  25 
E)  33

Question 11

The substance KClO4 in water solution is a:

Accepted Answer

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

Question 12

Gold does not react with either nitric acid or hydrochloric acid but with a combination of both called aqua regia. Identify the reducing agent in the following equation: Au(s) + 4 H+ + NO3- + 4 Cl- → [AuCl4]- + 2 H2O + NO(g)

Accepted Answer

A)  Au 
B)  H+ 
C)  NO3- 
D)  Cl- 
E)  Au and Cl- 
A)  Au 
B)  H+ 
C)  NO3- 
D)  Cl- 
E)  Au and Cl-

Question 13

Complete the equation and indicate if a precipitate forms. Li+ + Br- + Pb2+ + NO3- →

Accepted Answer

A)  PbBr2(s) + LiNO3(s) 
B)  Pb2+ + 2 Br- + LiNO3(s) 
C)  Pb(NO3)2(s) + Li+ + 2 Br- 
D)  no reaction 
E)  PbBr2(s) + Li+ + NO3- 
A)  PbBr2(s) + LiNO3(s) 
B)  Pb2+ + 2 Br- + LiNO3(s) 
C)  Pb(NO3)2(s) + Li+ + 2 Br- 
D)  no reaction 
E)  PbBr2(s) + Li+ + NO3-

Question 14

What concentration of Fe2(SO4)3(aq) is required for the solution to have [Fe3+(aq)] = 0.32 M?

Accepted Answer

A)  0.16 M 
B)  0.32 M 
C)  0.64 M 
D)  0.080 M 
E)  0.12 M 
A)  0.16 M 
B)  0.32 M 
C)  0.64 M 
D)  0.080 M 
E)  0.12 M

Question 15

Select a statement that best describes the oxidation process.

Accepted Answer

A)  In oxidation process all elements change oxidation state. 
B)  In oxidation process all elements experience an increase in oxidation state. 
C)  In oxidation process some elements change their oxidation state. 
D)  In oxidation process some elements experience oxidation state increase. 
E)  In oxidation process only oxygen increases its oxidation state. 
A)  In oxidation process all elements change oxidation state. 
B)  In oxidation process all elements experience an increase in oxidation state. 
C)  In oxidation process some elements change their oxidation state. 
D)  In oxidation process some elements experience oxidation state increase. 
E)  In oxidation process only oxygen increases its oxidation state.

Question 16

Balance the following equation for an oxidation-reduction reaction occurring in an acidic solution: IO3- + N2H4 → I- + N2 + H2O
The sum of the coefficients is ________.

Accepted Answer

A)  8 
B)  25 
C)  18 
D)  16 
E)  32 
A)  8 
B)  25 
C)  18 
D)  16 
E)  32

Question 17

A sample of magnesium oxide was dissolved in 50.0 mL of 0.183 M hydrochloric acid, and the excess acid was titrated to a phenolphthalein end-point by 13.4 mL of 0.105 M sodium hydroxide. What was the mass of the magnesium oxide sample?

Accepted Answer

A)  312 mg 
B)  184 mg 
C)  156 mg 
D)  104 mg 
E)  77.8 mg 
A)  312 mg 
B)  184 mg 
C)  156 mg 
D)  104 mg 
E)  77.8 mg

Question 18

The substance NH3 is a:

Accepted Answer

A)  weak acid 
B)  strong acid 
C)  salt 
D)  weak base 
E)  strong base 
A)  weak acid 
B)  strong acid 
C)  salt 
D)  weak base 
E)  strong base

Question 19

What is the concentration of Br-(aq) in a solution prepared by mixing 75.0 mL of 0.62 M iron(III) bromide with 75.0 mL of water? Assume volumes are additive.

Accepted Answer

A)  0.93 M 
B)  0.31 M 
C)  1.9 M 
D)  0.62 M 
E)  1.23 M 
A)  0.93 M 
B)  0.31 M 
C)  1.9 M 
D)  0.62 M 
E)  1.23 M

Question 20

To precipitate Ba2+ from solution, one could add:

Accepted Answer

A)  HCl(aq) 
B)  (NH4)2CO3(aq) in HN3(aq) 
C)  H2S(aq) in NH3/NH4+(aq) 
D)  H2S(aq) in 0.3 M HCl(aq) 
E)  NaCl(aq) 
A)  HCl(aq) 
B)  (NH4)2CO3(aq) in HN3(aq) 
C)  H2S(aq) in NH3/NH4+(aq) 
D)  H2S(aq) in 0.3 M HCl(aq) 
E)  NaCl(aq)

Exam 5: Introduction to Reactions in Aqueous Solutions

Oxidation never occurs alone.

In 0.20 M NH3(aq), the concentration of NH4+(aq) and OH-(aq) are approximately 0.20 M.

How many electrons are transferred when the perchlorate ion is converted to chloride?

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

Which of the following is most likely to be a strong oxidizing agent?

The substance HNO2 is a:

Which of the following reactions is an oxidation-reduction reaction?

What volume of 0.38 M hydrochloric acid is required for complete neutralization of 15 mL of 0.19 M calcium hydroxide?

Soluble ionic compounds form strong electrolytes.

Balance the following equation in basic solution: Al(s) + O2(g) → [Al(OH)4]- The sum of the coefficients is ________.

The substance KClO4 in water solution is a:

Gold does not react with either nitric acid or hydrochloric acid but with a combination of both called aqua regia. Identify the reducing agent in the following equation: Au(s) + 4 H+ + NO3- + 4 Cl- → [AuCl4]- + 2 H2O + NO(g)

Complete the equation and indicate if a precipitate forms. Li+ + Br- + Pb2+ + NO3- →

What concentration of Fe2(SO4)3(aq) is required for the solution to have [Fe3+(aq)] = 0.32 M?

Select a statement that best describes the oxidation process.

Balance the following equation for an oxidation-reduction reaction occurring in an acidic solution: IO3- + N2H4 → I- + N2 + H2O The sum of the coefficients is ________.

A sample of magnesium oxide was dissolved in 50.0 mL of 0.183 M hydrochloric acid, and the excess acid was titrated to a phenolphthalein end-point by 13.4 mL of 0.105 M sodium hydroxide. What was the mass of the magnesium oxide sample?

The substance NH3 is a:

What is the concentration of Br-(aq) in a solution prepared by mixing 75.0 mL of 0.62 M iron(III) bromide with 75.0 mL of water? Assume volumes are additive.

To precipitate Ba2+ from solution, one could add:

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

In 0.20 M NH₃(aq), the concentration of NH₄+(aq) and OH-(aq) are approximately 0.20 M.

The substance HNO₂ is a:

Balance the following equation in basic solution: Al(s) + O₂(g) → [Al(OH)₄]- The sum of the coefficients is ________.

The substance KClO₄ in water solution is a:

Gold does not react with either nitric acid or hydrochloric acid but with a combination of both called aqua regia. Identify the reducing agent in the following equation: Au(s) + 4 H⁺ + NO₃^- + 4 Cl- → [AuCl₄]^- + 2 H₂O + NO(g)

Complete the equation and indicate if a precipitate forms. Li⁺ + Br- + Pb²⁺ + NO₃- →

What concentration of Fe₂(SO₄)₃(aq) is required for the solution to have [Fe³⁺(aq)] = 0.32 M?

Balance the following equation for an oxidation-reduction reaction occurring in an acidic solution: IO₃^- + N₂H₄ → I^- + N₂ + H₂O The sum of the coefficients is ________.

The substance NH₃ is a:

To precipitate Ba²⁺ from solution, one could add: