Chemical Principles 8th Edition By Steven S. Zumdahl – Test Bank

1. Ammonium metavanadate reacts with sulfur dioxide in acidic solution as follows (hydrogen ions and H2O omitted):
xVO3– + ySO2 → xVO2+ + ySO42–
The ratio x : y is
a. 1 : 3
b. 1 : 2
c. 2 : 1
d. 3 : 1
e. 1 : 1
ANSWER: c
POINTS: 1
DIFFICULTY: easy
TOPICS: 11.1
KEYWORDS: Balancing Oxidation-Reduction Reactions | electrochemistry | general chemistry | half-reaction | Half-Reaction Method

2. What is the oxidation state of Mn in MnO4–?
a. 1
b. 9
c. 7
d. –1
e. 3
ANSWER: c
POINTS: 1
DIFFICULTY: easy
TOPICS: 11.1
KEYWORDS: assigning oxidation-number | chemical reactions | general chemistry | oxidation-reduction reaction | types of chemical reactions

3. How many electrons are transferred in the following reaction?
2Cr2O72– + 14H+ + 6Cl– → 2Cr3+ + 3Cl2 + 7H2O
a. 4
b. 2
c. 8
d. 6
e. none of these
ANSWER: d
POINTS: 1
DIFFICULTY: easy
TOPICS: 11.1
KEYWORDS: Balancing Oxidation-Reduction Reactions | electrochemistry | general chemistry | half-reaction | half-reaction method

4. How many electrons are transferred in the following reaction?
SO32–(aq) + MnO4–(aq) → SO42–(aq) + Mn2+(aq)
a. 4
b. 10
c. 3
d. 2
e. 6
ANSWER: b
POINTS: 1
DIFFICULTY: easy
TOPICS: 11.1
KEYWORDS: Balancing Oxidation-Reduction Reactions | electrochemistry | general chemistry | half-reaction | half-reaction method

5. Refer to the galvanic cell below (the contents of each half-cell are written beneath each compartment).

The standard reduction potentials are as follows:
MnO4– + 8H+ + 5e– → Mn2+ + 4H2O E° = 1.51 V
Cr2O72– +14H+ + 6e– → 2 Cr3+ +7H2O E° = 1.33 V

What is the oxidation state of Cr in Cr2O72–?
a. +6
b. –2
c. +12
d. –1
e. +7
ANSWER: a
POINTS: 1
DIFFICULTY: easy
TOPICS: 11.1
KEYWORDS: assigning oxidation-number | chemical reactions | general chemistry | oxidation-reduction reaction | types of chemical reactions

6. The following reaction occurs in basic solution:
Ag+ + Cu → Ag + Cu2+
When the equation is balanced, what is the sum of the coefficients?
a. 7
b. 6
c. 5
d. 4
e. 8
ANSWER: b
POINTS: 1
DIFFICULTY: easy
TOPICS: 11.1
KEYWORDS: Balancing Oxidation-Reduction Reactions | electrochemistry | general chemistry | half-reaction | half-reaction method

7. When the equation for the following reaction in basic solution is balanced, what is the sum of the coefficients?
MnO2 + HO2– → MnO4–
a. 11
b. 9
c. 18
d. 31
e. 14
ANSWER: b
POINTS: 1
DIFFICULTY: moderate
TOPICS: 11.1
KEYWORDS: Balancing Oxidation-Reduction Reactions | electrochemistry | general chemistry | half-reaction | half-reaction method

8. When the equation for the following reaction in basic solution is balanced, what is the sum of the coefficients?
MnO4–(aq) + CN–(aq) → MnO2(s) + CNO–(aq)
a. 20
b. 10
c. 8
d. 13
e. 11
ANSWER: d
POINTS: 1
DIFFICULTY: moderate
TOPICS: 11.1
KEYWORDS: acids and bases | Balancing Oxidation-Reduction Reactions | general chemistry | half-reaction | half-reaction method

9. The reaction below occurs in basic solution. In the balanced equation, what is the sum of the coefficients?
Zn + NO3– → Zn(OH)42– + NH3
a. 27
b. 19
c. 23
d. 12
e. 15
ANSWER: c
POINTS: 1
DIFFICULTY: moderate
TOPICS: 11.1
KEYWORDS: Balancing Oxidation-Reduction Reactions | electrochemistry | general chemistry | half-reaction | half-reaction method

10. A strip of copper is placed in a 1 M solution of copper nitrate, and a strip of silver is placed in a 1 M solution of silver nitrate. The two metal strips are connected to a voltmeter by wires, and a salt bridge connects the solutions. The following standard reduction potentials apply:
Ag+(aq) + e– → Ag(s) E° = +0.80 V
Cu2+(aq) + 2e– → Cu(s) E° = +0.34 V
When the voltmeter is removed and the two electrodes are connected by a wire, which of the following does not take place?
a. Negative ions pass through the salt bridge from the silver half-cell to the copper half-cell.
b. The silver electrode increases in mass as the cell operates.
c. Electrons flow in the external circuit from the copper electrode to the silver electrode.
d. Some positive copper ions pass through the salt bridge from the copper half-cell to the silver half-cell.
e. There is a net general movement of silver ions through the salt bridge to the copper half-cell.
ANSWER: e
POINTS: 1
DIFFICULTY: moderate
TOPICS: 11.1
11.2
KEYWORDS: construction of voltaic cells | electrochemistry | general chemistry | voltaic cells