Question 1

1V = ________.

Accepted Answer

A)  1 amp ∙ s
B)  1 J/s
C)  96485 C
D)  1 J/C
E)  1 C/JF) A) and B)
G) All of the above

Question 2

At constant temperature and pressure the Gibbs free energy value is a measure of the ________ of a process.

Accepted Answer

The answer of At constant temperature and pressure the Gibbs...

Question 3

How many seconds are required to produce 1.0 g of silver metal by the electrolysis of a AgNO3 solution using a current of 60 amps?

Accepted Answer

A)  5.4 × 104
B)  3.2 × 103
C)  15
D)  3.7 × 10-5
E)  30F) B) and E)
G) C) and D)

Question 4

The standard cell potential (E° cell) for the reaction below is +1.10 V. The cell potential for this reaction is ________ V when the concentration of [Cu2+] = 1.0 × 10-5 M and [Zn2+] = 3.0 M. Zn (s)  + Cu2+ (aq)  → Cu (s)  + Zn2+ (aq)

Accepted Answer

A)  1.42
B)  1.26
C)  0.94
D)  0.78
E)  1.10F) B) and C)
G) A) and C) C

Question 5

The purpose of the salt bridge in an electrochemical cell is to ________.

Accepted Answer

A)  maintain electrical neutrality in the half-cells via migration of ions
B)  provide a source of ions to react at the anode and cathode
C)  provide oxygen to facilitate oxidation at the anode
D)  provide a means for electrons to travel from the anode to the cathode
E)  provide a means for electrons to travel from the cathode to the anodeF) C) and D)
G) A) and E)

Question 6

Table 20.2 cell) for the voltaic cell based on the reaction below is ________ V. 2Cr (s)  + 3Fe2+ (aq)  → 3Fe (s)  + 2Cr3+ (aq)  A) +0.30 B) +2.80 C) +3.10 D) +0.83 E) -0.16" class="answers-bank-image d-inline" rel="preload" >
-The standard cell potential (E°cell) for the voltaic cell based on the reaction below is ________ V. 2Cr (s)  + 3Fe2+ (aq)  → 3Fe (s)  + 2Cr3+ (aq)

Accepted Answer

A)  +0.30
B)  +2.80
C)  +3.10
D)  +0.83
E)  -0.16F) None of the above
G) A) and B)

Question 7

The standard emf for the cell using the overall cell reaction below is +2.20 V: 2Al (s)  + 3I2 (s)  → 2Al3+ (aq) + 6I- (aq) 
The emf generated by the cell when [Al3+] = 3.5 × 10-3 M and [I-] = 0.30 M is ________ V.

Accepted Answer

A)  2.20
B)  2.28
C)  2.12
D)  2.36
E)  2.23F) B) and D)
G) All of the above

Question 8

Which element is reduced in the reaction below? I-  + MnO4- + H+ → I2 + MnO2 + H2O

Accepted Answer

A)  I
B)  Mn
C)  O
D)  HE) A) and B)
F) C) and D)

Question 9

Which substance is the oxidizing agent in the reaction below? Pb + PbO2 + 2H2SO4 → 2PbSO4 + 2H2O

Accepted Answer

A)  Pb
B)  H2SO4
C)  PbO2
D)  PbSO4
E)  H2OF) B) and C)
G) C) and E)

Question 10

Table 20.2 4+ (aq)  + Fe3+ (aq)  → Sn2+ (aq)  + Fe2+ (aq)  B) 3Fe (s)  + 2Cr3+ (aq)  → 2Cr (s)  + 3Fe2+ (aq)  C) Sn4+ (aq)  + Fe2+ (aq)  → Sn2+ (aq)  + Fe (s)  D) 3Sn4+ (aq)  + 2Cr (s)  → 2Cr3+ (aq)  + 3Sn2+ (aq)  E) 3Fe2+ (aq)  → Fe (s)  + 2Fe3+ (aq) " class="answers-bank-image d-inline" rel="preload" >
-Which of the following reactions will occur spontaneously as written?

Accepted Answer

A)  Sn4+ (aq)  + Fe3+ (aq)  → Sn2+ (aq)  + Fe2+ (aq) 
B)  3Fe (s)  + 2Cr3+ (aq)  → 2Cr (s)  + 3Fe2+ (aq) 
C)  Sn4+ (aq)  + Fe2+ (aq)  → Sn2+ (aq)  + Fe (s) 
D)  3Sn4+ (aq)  + 2Cr (s)  → 2Cr3+ (aq)  + 3Sn2+ (aq) 
E)  3Fe2+ (aq)  → Fe (s)  + 2Fe3+ (aq) F) None of the above
G) A) and B)

Question 11

How many minutes will it take to plate out 4.56 g of Ni metal from a solution of Ni2+ using a current of 50.5 amps in an electrolytic cell?

Accepted Answer

A)  2.47
B)  4.95
C)  4.55
D)  148
E)  297F) C) and D)
G) A) and E)

Question 12

What is the coefficient of the permanganate ion when the following equation is balanced? MnO4- + Br- → Mn2+ + Br2 (acidic solution)

Accepted Answer

A)  1
B)  2
C)  3
D)  5
E)  4F) C) and E)
G) A) and C) B

Question 13

The standard cell potential (E°cell) of the reaction below is +1.34 V. The value of ΔG° for the reaction is ________ kJ/mol. 3 Cu (s)  + 2 MnO4- (aq) + 8H+ (aq)  → 3 Cu2+ (aq) + 2 MnO2 (s)  + 4 H2O (l)

Accepted Answer

A)  -24.3
B)  +259
C)  -259
D)  +776
E)  -776F) A) and B)
G) B) and E)

Question 14

Which transformation could take place at the cathode of an electrochemical cell?

Accepted Answer

A)  MnO2 → MnO4-
B)  Br2 → BrO3-
C)  NO → HNO2
D)  HSO4- → H2SO3
E)  Mn2+ → MnO4-F) B) and E)
G) None of the above

Question 15

Which substance is the reducing agent in the reaction below? Pb + PbO2 + 2H2SO4 → 2PbSO4 + 2H2O

Accepted Answer

A)  Pb
B)  H2SO4
C)  PbO2
D)  PbSO4
E)  H2OF) A) and B)
G) A) and D) A

Question 16

Which substance is the oxidizing agent in the following reaction? Fe2S3 + 12HNO3 → 2Fe(NO3) 3 + 3S + 6NO2 + 6H2O

Accepted Answer

A)  HNO3
B)  S
C)  NO2
D)  Fe2S3
E)  H2OF) C) and D)
G) D) and E)

Question 17

Consider an electrochemical cell based on the reaction: 2H+ (aq)  + Sn (s)  → Sn2+ (aq)  + H2 (g) 
Which of the following actions would not change the measured cell potential?

Accepted Answer

A)  lowering the pH in the cathode compartment
B)  addition of more tin metal to the anode compartment
C)  increasing the tin (II) ion concentration in the anode compartment
D)  increasing the pressure of hydrogen gas in the cathode compartment
E)  Any of the above will change the measured cell potential.F) C) and E)
G) A) and E)

Question 18

In a voltaic cell, electrons flow from the ________ to the ________.

Accepted Answer

A)  salt bride, anode
B)  anode, salt bridge
C)  cathode, anode
D)  salt bridge, cathode
E)  anode, cathodeF) A) and B)
G) B) and E)

Question 19

Which transformation could take place at the anode of an electrochemical cell?

Accepted Answer

A)  Cr2O72- → Cr2+
B)  F2 to F-
C)  O2 to H2O
D)  HAsO2 to As
E)  None of the above could take place at the anode.F) B) and C)
G) A) and B)

Question 20

What is the oxidation number of manganese in MnO2?

Accepted Answer

A)  +3
B)  +2
C)  +1
D)  +4
E)  +7F) C) and D)
G) A) and C)

Exam 20: Electrochemistry

1V = ________.

Correct AnswerverifiedShow Answer

At constant temperature and pressure the Gibbs free energy value is a measure of the ________ of a process.

Correct AnswerverifiedShow Answer

How many seconds are required to produce 1.0 g of silver metal by the electrolysis of a AgNO3 solution using a current of 60 amps?

Correct AnswerverifiedShow Answer

The standard cell potential (E° cell) for the reaction below is +1.10 V. The cell potential for this reaction is ________ V when the concentration of [Cu2+] = 1.0 × 10-5 M and [Zn2+] = 3.0 M. Zn (s) + Cu2+ (aq) → Cu (s) + Zn2+ (aq)

Correct AnswerverifiedC

The purpose of the salt bridge in an electrochemical cell is to ________.

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Table 20.2 -The standard cell potential (E°cell) for the voltaic cell based on the reaction below is ________ V. 2Cr (s) + 3Fe2+ (aq) → 3Fe (s) + 2Cr3+ (aq)

Correct AnswerverifiedShow Answer

The standard emf for the cell using the overall cell reaction below is +2.20 V: 2Al (s) + 3I2 (s) → 2Al3+ (aq) + 6I- (aq) The emf generated by the cell when [Al3+] = 3.5 × 10-3 M and [I-] = 0.30 M is ________ V.

Correct AnswerverifiedShow Answer

Which element is reduced in the reaction below? I- + MnO4- + H+ → I2 + MnO2 + H2O

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Which substance is the oxidizing agent in the reaction below? Pb + PbO2 + 2H2SO4 → 2PbSO4 + 2H2O

Correct AnswerverifiedShow Answer

Table 20.2 -Which of the following reactions will occur spontaneously as written?

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How many minutes will it take to plate out 4.56 g of Ni metal from a solution of Ni2+ using a current of 50.5 amps in an electrolytic cell?

Correct AnswerverifiedShow Answer

What is the coefficient of the permanganate ion when the following equation is balanced? MnO4- + Br- → Mn2+ + Br2 (acidic solution)

Correct AnswerverifiedB

The standard cell potential (E°cell) of the reaction below is +1.34 V. The value of ΔG° for the reaction is ________ kJ/mol. 3 Cu (s) + 2 MnO4- (aq) + 8H+ (aq) → 3 Cu2+ (aq) + 2 MnO2 (s) + 4 H2O (l)

Correct AnswerverifiedShow Answer

Which transformation could take place at the cathode of an electrochemical cell?

Correct AnswerverifiedShow Answer

Which substance is the reducing agent in the reaction below? Pb + PbO2 + 2H2SO4 → 2PbSO4 + 2H2O

Correct AnswerverifiedA

Which substance is the oxidizing agent in the following reaction? Fe2S3 + 12HNO3 → 2Fe(NO3) 3 + 3S + 6NO2 + 6H2O

Correct AnswerverifiedShow Answer

Consider an electrochemical cell based on the reaction: 2H+ (aq) + Sn (s) → Sn2+ (aq) + H2 (g) Which of the following actions would not change the measured cell potential?

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In a voltaic cell, electrons flow from the ________ to the ________.

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Which transformation could take place at the anode of an electrochemical cell?

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What is the oxidation number of manganese in MnO2?

Correct AnswerverifiedShow Answer

Correct Answer
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How many seconds are required to produce 1.0 g of silver metal by the electrolysis of a AgNO₃ solution using a current of 60 amps?

Correct Answer
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The standard cell potential (E° cell) for the reaction below is +1.10 V. The cell potential for this reaction is ________ V when the concentration of [Cu²⁺] = 1.0 × 10^-⁵ M and [Zn²⁺] = 3.0 M. Zn (s) + Cu²⁺ (aq) → Cu (s) + Zn²⁺ (aq)

Correct Answer
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C

Correct Answer
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Table 20.2 -The standard cell potential (E°_cell) for the voltaic cell based on the reaction below is ________ V. 2Cr (s) + 3Fe²⁺ (aq) → 3Fe (s) + 2Cr³⁺ (aq)

Correct Answer
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The standard emf for the cell using the overall cell reaction below is +2.20 V: 2Al (s) + 3I₂ (s) → 2Al³⁺ (aq) + 6I^- (aq) The emf generated by the cell when [Al³⁺] = 3.5 × 10^-³ M and [I^-] = 0.30 M is ________ V.

Correct Answer
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Which element is reduced in the reaction below? I^- + MnO₄^- + H⁺ → I₂ + MnO₂ + H₂O

Correct Answer
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Which substance is the oxidizing agent in the reaction below? Pb + PbO₂ + 2H₂SO₄ → 2PbSO₄ + 2H₂O

Correct Answer
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Correct Answer
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How many minutes will it take to plate out 4.56 g of Ni metal from a solution of Ni²⁺ using a current of 50.5 amps in an electrolytic cell?

Correct Answer
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What is the coefficient of the permanganate ion when the following equation is balanced? MnO₄^- + Br^- → Mn²⁺ + Br₂ (acidic solution)

Correct Answer
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B

The standard cell potential (E°_cell) of the reaction below is +1.34 V. The value of ΔG° for the reaction is ________ kJ/mol. 3 Cu (s) + 2 MnO₄^- (aq) + 8H⁺ (aq) → 3 Cu²⁺ (aq) + 2 MnO₂ (s) + 4 H₂O (l)

Correct Answer
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Correct Answer
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Which substance is the reducing agent in the reaction below? Pb + PbO₂ + 2H₂SO₄ → 2PbSO₄ + 2H₂O

Correct Answer
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A

Which substance is the oxidizing agent in the following reaction? Fe₂S₃ + 12HNO₃ → 2Fe(NO₃) ₃ + 3S + 6NO₂ + 6H₂O

Correct Answer
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Consider an electrochemical cell based on the reaction: 2H⁺ (aq) + Sn (s) → Sn²⁺ (aq) + H₂ (g) Which of the following actions would not change the measured cell potential?

Correct Answer
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In a voltaic cell, electrons flow from the to the .

Correct Answer
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Correct Answer
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What is the oxidation number of manganese in MnO₂?

Correct Answer
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