Question 1

Consider the galvanic cell, 2+] concentration B)  increase the [Pb2+] concentration C)  increase the mass of Zn(s)  D)  decrease the mass of Zn(s) " class="answers-bank-image d-inline" rel="preload" > Which one of the following changes to the cell would cause the cell potential to increase (i.e.,become more positive) ?

Accepted Answer

A)   increase the [Zn2+] concentration
B)   increase the [Pb2+] concentration
C)   increase the mass of Zn(s) 
D)   decrease the mass of Zn(s) E) A) and B)
F) All of the above

Question 2

What statement is NOT true about standard electrode potentials?

Accepted Answer

A)   E°cell is positive for spontaneous reactions.
B)   Electrons will flow from more negative electrode to more positive electrode.
C)   The electrode potential of the standard hydrogen electrode is exactly zero.
D)   E°cell is the difference in voltage between the anode and the cathode.
E)   The electrode in any half-cell with a greater tendency to undergo reduction is positively charged relative to the standard hydrogen electrode and therefore has a positive E°.F) A) and E)
G) A) and B)

Question 3

In a nickel-cadmium battery,NiO(OH) is reduced to

Accepted Answer

A)   Ni(OH) 4.
B)   NiO2.
C)   Ni.
D)   Ni(OH) 2.
E)   NiOH.F) D) and E)
G) A) and D)

Question 4

In a voltaic cell,the anode is defined as

Accepted Answer

A)   a metal contact.
B)   the more positively charged electrode.
C)   the positive terminal of the power source.
D)   the more negatively charged electrode.
E)   the negative terminal of the power source.F) B) and C)
G) B) and D)

Question 5

Predict the species that will be reduced first if the following mixture of molten salts undergoes electrolysis. Zn2+,Fe3+,Mg2+,Br-,I-

Accepted Answer

A)   Zn2+
B)   Mg2+
C)   Br-
D)   Fe3+
E)   I-F) None of the above
G) C) and D)

Question 6

How many electrons are transferred in the following reaction? (The reaction is unbalanced.)  Ni(s) + Cr3+(aq) → Cr(s) + Ni2+(aq)

Accepted Answer

A)   6
B)   2
C)   3
D)   1
E)   4F) B) and D)
G) A) and C)

Question 7

Predict the species that will be reduced first if the following mixture of molten salts undergoes electrolysis. Na+,Ca2+,Cl⁻,Br⁻,F⁻

Accepted Answer

A)   Na+
B)   Cl-
C)   Ca2+
D)   Br-
E)   F-F) None of the above
G) All of the above

Question 8

What is the oxidizing agent in the redox reaction represented by the following cell notation? Sn(s) ∣ Sn2+(aq)  2+(aq)    Ag+(aq) ∣ Ag(s)  A)  Sn(s)  B)  Ag+(aq)  C)  Sn2+(aq)  D)  Ag(s)  E)  Pt" class="answers-bank-image d-inline" rel="preload" > Ag+(aq) ∣ Ag(s)

Accepted Answer

A)   Sn(s) 
B)   Ag+(aq) 
C)   Sn2+(aq) 
D)   Ag(s) 
E)   PtF) A) and C)
G) D) and E)

Question 9

In an electrolytic cell,the anode is defined as

Accepted Answer

A)   a metal contact.
B)   the more positively charged electrode.
C)   the positive terminal of the power source.
D)   the more negatively charged electrode.
E)   the negative terminal of the power source.F) A) and B)
G) A) and C)

Question 10

In a lead-acid storage battery,Pb is oxidized to

Accepted Answer

A)   PbO2.
B)   PbSO4.
C)   Pb2O.
D)   PbO3.
E)   PbO.F) D) and E)
G) A) and E)

Question 11

Which of the following is the strongest reducing agent?

Accepted Answer

A)   Ba(s) 
B)   Li+(aq) 
C)   Na(s) 
D)   Cr2+(aq) 
E)   Li(s) F) A) and D)
G) A) and C)

Question 12

Which of the following reactions would have the smallest value of K at 298 K?

Accepted Answer

A)   A + B → C; E°cell = +1.22 V
B)   A + 2 B → C; E°cell = +0.98 V
C)   A + B → 2 C; E°cell = -0.030 V
D)   A + B → 3 C; E°cell = +0.15 V
E)   More information is needed to determine.F) B) and D)
G) A) and B)

Question 13

Sketch a voltaic cell that contains the following half reactions and label all relevant components.
Zn2+(aq)+ 2e⁻ → Zn(s)E°= -0.76 V
Cu2+(aq)+ 2e⁻ → Cu(s)E°= +0.34 V

Accepted Answer

The sketch should be...

Question 14

For the galvanic cell reaction,expressed below using shorthand notation,what half-reaction occurs at the cathode? Zn(s) ∣ Zn2+(aq) ∣∣ Ni2+(aq) ∣ Ni(s)

Accepted Answer

A)   Zn(s)  → Zn2+(aq)  + 2 e-
B)   Zn2+(aq)  + 2 e- → Zn(s) 
C)   Ni(s)  → Ni2+(aq)  + 2 e-
D)   Ni2+(aq)  + 2 e- → Ni(s) E) A) and B)
F) A) and C)

Question 15

Identify the battery type that has a high overcharge tolerance.

Accepted Answer

A)   NiCad
B)   Li ion
C)   NiMH
D)   lead storage
E)   none of the aboveF) A) and D)
G) A) and B)

Question 16

What element is being oxidized in the following redox reaction? Cr(OH) 4-(aq) + ClO-(aq) → CrO42-(aq) + Cl-(aq)

Accepted Answer

A)   Cr
B)   O
C)   H
D)   ClE) B) and C)
F) C) and D)

Question 17

What element is being reduced in the following redox reaction? Cr(OH) 4⁻(aq) + ClO⁻(aq) → CrO42-(aq) + Cl⁻(aq)

Accepted Answer

A)   Cr
B)   O
C)   H
D)   ClE) B) and C)
F) A) and D)

Question 18

What is the reduction half-reaction for the following overall galvanic cell reaction? Co2+(aq) + 2 Ag(s) → Co(s) + 2 Ag+(aq)

Accepted Answer

A)   Ag(s)  + e- → Ag+(aq) 
B)   Ag+(aq)  + e- → Ag(s) 
C)   Co2+(aq)  + 2 e- → Co(s) 
D)   Co2+(aq)  + e- → Co(s) E) B) and D)
F) C) and D)

Question 19

Balance the following redox reaction if it occurs in acidic solution.What are the coefficients in front of Pb and H+ in the balanced reaction? 
Pb2+(aq) + NH4+(aq) ? Pb(s) + NO3?(aq)

Accepted Answer

A)   Pb = 1, H? = 8
B)   Pb = 1, H? = 2
C)   Pb = 4, H? = 10
D)   Pb = 2, H? = 3
E)   Pb = 3, H? = 5F) All of the above
G) A) and D)

Question 20

Calculate the cell potential for the following reaction that takes place in an electrochemical cell at 25°C. Fe(s) ∣ Fe3+(aq,0.0011 M)  3+(aq,0.0011 M)    Fe3+(aq,2.33 M) ∣ Fe(s)  A)  +0.066 V B)  -0.036 V C)  0.00 V D)  -0.099 V E)  +0.20 V" class="answers-bank-image d-inline" rel="preload" > Fe3+(aq,2.33 M) ∣ Fe(s)

Accepted Answer

A)   +0.066 V
B)   -0.036 V
C)   0.00 V
D)   -0.099 V
E)   +0.20 VF) A) and B)
G) None of the above

Exam 19: Electrochemistry

Predict the species that will be reduced first if the following mixture of molten salts undergoes electrolysis. Zn2+,Fe3+,Mg2+,Br-,I-

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Identify the battery type that has a high overcharge tolerance.

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Which of the following is the strongest reducing agent?

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For the galvanic cell reaction,expressed below using shorthand notation,what half-reaction occurs at the cathode? Zn(s) ∣ Zn2+(aq) ∣∣ Ni2+(aq) ∣ Ni(s)

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Consider the galvanic cell, Which one of the following changes to the cell would cause the cell potential to increase (i.e.,become more positive) ?

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How many electrons are transferred in the following reaction? (The reaction is unbalanced.) Ni(s) + Cr3+(aq) → Cr(s) + Ni2+(aq)

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In an electrolytic cell,the anode is defined as

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What element is being reduced in the following redox reaction? Cr(OH) 4⁻(aq) + ClO⁻(aq) → CrO42-(aq) + Cl⁻(aq)

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In a nickel-cadmium battery,NiO(OH) is reduced to

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Sketch a voltaic cell that contains the following half reactions and label all relevant components. Zn2+(aq)+ 2e⁻ → Zn(s)E°= -0.76 V Cu2+(aq)+ 2e⁻ → Cu(s)E°= +0.34 V

Correct AnswerverifiedThe sketch should be...View AnswerShow Answer

Balance the following redox reaction if it occurs in acidic solution.What are the coefficients in front of Pb and H+ in the balanced reaction? Pb2+(aq) + NH4+(aq) ? Pb(s) + NO3?(aq)

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In a lead-acid storage battery,Pb is oxidized to

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What is the reduction half-reaction for the following overall galvanic cell reaction? Co2+(aq) + 2 Ag(s) → Co(s) + 2 Ag+(aq)

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Predict the species that will be reduced first if the following mixture of molten salts undergoes electrolysis. Na+,Ca2+,Cl⁻,Br⁻,F⁻

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What statement is NOT true about standard electrode potentials?

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Which of the following reactions would have the smallest value of K at 298 K?

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Calculate the cell potential for the following reaction that takes place in an electrochemical cell at 25°C. Fe(s) ∣ Fe3+(aq,0.0011 M) Fe3+(aq,2.33 M) ∣ Fe(s)

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What is the oxidizing agent in the redox reaction represented by the following cell notation? Sn(s) ∣ Sn2+(aq) Ag+(aq) ∣ Ag(s)

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In a voltaic cell,the anode is defined as

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What element is being oxidized in the following redox reaction? Cr(OH) 4-(aq) + ClO-(aq) → CrO42-(aq) + Cl-(aq)

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Predict the species that will be reduced first if the following mixture of molten salts undergoes electrolysis. Zn²⁺,Fe³⁺,Mg²⁺,Br^-,I^-

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For the galvanic cell reaction,expressed below using shorthand notation,what half-reaction occurs at the cathode? Zn(s) ∣ Zn²⁺(aq) ∣∣ Ni²⁺(aq) ∣ Ni(s)

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How many electrons are transferred in the following reaction? (The reaction is unbalanced.) Ni(s) + Cr³⁺(aq) → Cr(s) + Ni²⁺(aq)

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What element is being reduced in the following redox reaction? Cr(OH) ₄⁻(aq) + ClO⁻(aq) → CrO₄^2-(aq) + Cl⁻(aq)

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Sketch a voltaic cell that contains the following half reactions and label all relevant components. Zn²⁺(aq)+ 2e⁻ → Zn(s)E°= -0.76 V Cu²⁺(aq)+ 2e⁻ → Cu(s)E°= +0.34 V

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The sketch should be...
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Balance the following redox reaction if it occurs in acidic solution.What are the coefficients in front of Pb and H⁺ in the balanced reaction? Pb²⁺(aq) + NH₄⁺(aq) ? Pb(s) + NO₃?(aq)

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Correct Answer
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What is the reduction half-reaction for the following overall galvanic cell reaction? Co²⁺(aq) + 2 Ag(s) → Co(s) + 2 Ag⁺(aq)

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Predict the species that will be reduced first if the following mixture of molten salts undergoes electrolysis. Na⁺,Ca²⁺,Cl⁻,Br⁻,F⁻

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Calculate the cell potential for the following reaction that takes place in an electrochemical cell at 25°C. Fe(s) ∣ Fe³⁺(aq,0.0011 M) Fe³⁺(aq,2.33 M) ∣ Fe(s)

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What is the oxidizing agent in the redox reaction represented by the following cell notation? Sn(s) ∣ Sn²⁺(aq) Ag⁺(aq) ∣ Ag(s)

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What element is being oxidized in the following redox reaction? Cr(OH) ₄^-(aq) + ClO^-(aq) → CrO₄^2-(aq) + Cl^-(aq)

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