Question 1

What is E°cell for a galvanic cell represented by the combination of the following half-reactions? 2Hg2+(aq) + 2e-
  cell for a galvanic cell represented by the combination of the following half-reactions? 2Hg2+(aq) + 2e-     Hg22+(aq) E°= 0.92V Cr3+(aq) +   3e- Cr(s) E°= -0.74V A) -0.18 V B) 0.18 V C) 1.28 V D) 1.66 V E) 2.12 V" class="answers-bank-image d-inline" rel="preload" > Hg22+(aq) E°= 0.92V
Cr3+(aq) + cell for a galvanic cell represented by the combination of the following half-reactions? 2Hg2+(aq) + 2e-     Hg22+(aq) E°= 0.92V Cr3+(aq) +   3e- Cr(s) E°= -0.74V A) -0.18 V B) 0.18 V C) 1.28 V D) 1.66 V E) 2.12 V" class="answers-bank-image d-inline" rel="preload" > 3e- Cr(s) E°= -0.74V

Accepted Answer

A)  -0.18 V
B)  0.18 V
C)  1.28 V
D)  1.66 V
E)  2.12 VF) None of the above
G) A) and B)

Question 2

How many minutes would be required to electroplate 25.0 g of chromium by passing a constant current of 4.80 A through a solution containing CrCl3?

Accepted Answer

A)  483 min
B)  161 min
C)  322 min
D)  2.01 × 104 min
E)  1.11 × 104 minF) A) and B)
G) D) and E)

Question 3

What quantity of charge is required to cause reduction of 0.20 mole of Cr3+ to Cr?

Accepted Answer

A)  0.60 C
B)  3.0 C
C)  1.9 × 104 C
D)  5.8 × 104 C
E)  9.7 × 104 CF) A) and B)
G) None of the above

Question 4

The equilibrium constant for the reaction of Ni2+ with Cd is 1.17 x 105.Calculate the free energy change for the reaction at 25oC.

Accepted Answer

A)  -12.6 kJ
B)  -28.9 kJ
C)  2.43 kJ
D)  28.9 kJ
E)  12.6 kJF) C) and E)
G) C) and D)

Question 5

What is the equilibrium constant at 25°C for the following reaction? (R = 8.314 J/K • mol,F = 96,500 C • mol-1) 
2Cr(s) + 3Pb2+(aq)  -1)  2Cr(s) + 3Pb2+(aq)    3Pb(s) +2Cr3+(aq) E°cell = 0.61V A) 4.1 × 1020 B) 8.2 × 1030 C) 3.3 × 1051 D) 6.7 × 1061 E) > 9.9 × 1099" class="answers-bank-image d-inline" rel="preload" > 3Pb(s) +2Cr3+(aq) E°cell = 0.61V

Accepted Answer

A)  4.1 × 1020
B)  8.2 × 1030
C)  3.3 × 1051
D)  6.7 × 1061
E)  > 9.9 × 1099F) A) and C)
G) B) and E)

Question 6

Which statement is correct?

Accepted Answer

A)  The cathode is the electrode where the oxidation takes place.
B)  The cathode is the electrode where the reduction takes place.
C)  Both oxidation and reduction make take place at the cathode,depending on the cell.
D)  The cathode is always positive.
E)  The anode is always negative.F) A) and E)
G) C) and E)

Question 7

Predict the products obtained from the electrolysis of a 1 M AlBr3 solution. Note that 2H2O(l) + 2e- → H2(g) +2OH-(aq) ,E° = -0.83 V
O2(g) + 4H+(aq) + 4e- → 2H2O(l) ,E° = +1.23 V
Br2(l) + 2e- → 2Br-(aq) E° = +1.08 V,and
Al3+(aq) + 3e- → Al(s) E° = -1.66 V

Accepted Answer

A)  Al and Br2
B)  Al and O2
C)  H2 and O2
D)  H2 and Br2
E)  Al and H2F) A) and B)
G) D) and E)

Question 8

Which element is associated with the term "galvanized"?

Accepted Answer

A)  Ga
B)  Zn
C)  Cd
D)  Hg
E)  PbF) B) and C)
G) A) and D)

Question 9

What product forms at the cathode during the electrolysis of molten lithium iodide?

Accepted Answer

A)  Li+(l) 
B)  Li(l) 
C)  I-(l) 
D)  I2(g) 
E)  I3-(l) F) B) and E)
G) A) and B)

Question 10

When the following redox equation is balanced using the smallest whole-number coefficients,what is the coefficient of NO2? Sn + HNO3 → SnO2 + NO2 + H2O (acidic solution)

Accepted Answer

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

Question 11

Consider the reaction of iodine with manganese dioxide. 3I2(s) + 2MnO2(s) + 8OH-(aq)  2(s) + 2MnO2(s) + 8OH-(aq)    6I-(aq) + 2MnO4-(aq) + 4H2O(l)  The equilibrium constant for the overall reaction is 8.3 × 10-7.What is E°cell for the reaction at 25°C? (R = 8.314 J/K • mol,F = 96,500 C • mol-1)  A) -0.36 V B) -0.18 V C) -0.12 V D) -0.060 V E) +0.12 V" class="answers-bank-image d-inline" rel="preload" > 6I-(aq) + 2MnO4-(aq) + 4H2O(l) 
The equilibrium constant for the overall reaction is 8.3 × 10-7.What is E°cell for the reaction at 25°C? (R = 8.314 J/K • mol,F = 96,500 C • mol-1)

Accepted Answer

A)  -0.36 V
B)  -0.18 V
C)  -0.12 V
D)  -0.060 V
E)  +0.12 VF) C) and E)
G) B) and E)

Question 12

A lead-storage battery is not rechargeable.

Accepted Answer

A) True 
 B)False

Question 13

When the following redox equation is balanced with the smallest whole number coefficients,what is the coefficient of Sn(OH) 3-? Bi(OH) 3(s) + Sn(OH) 3-(aq) → Sn(OH) 62-(aq) + Bi(s)  (basic solution)

Accepted Answer

A)  1
B)  2
C)  3
D)  6
E)  12F) B) and D)
G) All of the above

Question 14

What is ΔG° for the reaction of iron(II) ions with one mole of permanganate ions? (F = 96,500 C • mol-1) 
MnO4-(aq) + 8H+(aq) + 5e- -1)  MnO4-(aq) + 8H+(aq) + 5e-   Mn2+(aq) +4H2O(l) E° = 1.51V Fe3+(aq) + e- Fe2+(aq) E° = 0.77V A) -71.4 kJ B) -286 kJ C) -357 kJ D) -428 kJ E) None of these choices is correct." class="answers-bank-image d-inline" rel="preload" > Mn2+(aq) +4H2O(l) E° = 1.51V
Fe3+(aq) + e- Fe2+(aq) E° = 0.77V

Accepted Answer

A)  -71.4 kJ
B)  -286 kJ
C)  -357 kJ
D)  -428 kJ
E)  None of these choices is correct.F) C) and D)
G) All of the above

Question 15

___________ occurs at the cathode in a galvanic cell.

Accepted Answer

The answer of ___________ occurs at the cathode in a...

Question 16

What is the name given to the apparatus where oxidation occurs in a cell where electricity flows?

Accepted Answer

A)  Cathode
B)  Electrode
C)  Galvanic cell
D)  Anode
E)  Voltaic cellF) All of the above
G) A) and D)

Question 17

If a substance is reduced,it must undergo a

Accepted Answer

A)  gain of electrons.
B)  loss of oxygen.
C)  gain of hydrogen.
D)  loss of electrons.
E)  gain of oxygen.F) A) and D)
G) B) and E)

Question 18

Which is the Nernst equation?

Accepted Answer

A)   
B)   
C)   
D)   
E)  None of these statements is correct.F) B) and C)
G) All of the above

Question 19

A voltaic cell prepared using aluminum and nickel has the following cell notation. Al(s) | Al3+(aq) || Ni2+(aq) | Ni(s) 
Which reaction occurs at the anode?

Accepted Answer

A)  Al(s) → Al3+(aq) + 3e-
B)  Al3+(aq) + 3e- → Al(s) 
C)  Ni(s) → Ni2+(aq) + 2e-
D)  Ni2+(aq) + 2e- → Ni(s) 
E)  Ni(s) + Ni2+(aq) → Al(s) + Al3+(aq) F) B) and C)
G) D) and E)

Question 20

What mass of nickel may be electroplated by passing a constant current of 7.2 A through a solution of NiSO4 for 90.0 min?

Accepted Answer

A)  0.20 g Ni
B)  0.40 g Ni
C)  12 g Ni
D)  24 g Ni
E)  47 g NiF) A) and B)
G) All of the above

Exam 19: Electrochemistry

Which element is associated with the term "galvanized"?

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Which is the Nernst equation?

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What is the equilibrium constant at 25°C for the following reaction? (R = 8.314 J/K • mol,F = 96,500 C • mol-1) 2Cr(s) + 3Pb2+(aq) 3Pb(s) +2Cr3+(aq) E°cell = 0.61V

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A voltaic cell prepared using aluminum and nickel has the following cell notation. Al(s) | Al3+(aq) || Ni2+(aq) | Ni(s) Which reaction occurs at the anode?

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Which statement is correct?

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Consider the reaction of iodine with manganese dioxide. 3I2(s) + 2MnO2(s) + 8OH-(aq) 6I-(aq) + 2MnO4-(aq) + 4H2O(l) The equilibrium constant for the overall reaction is 8.3 × 10-7.What is E°cell for the reaction at 25°C? (R = 8.314 J/K • mol,F = 96,500 C • mol-1)

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A lead-storage battery is not rechargeable.

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What is ΔG° for the reaction of iron(II) ions with one mole of permanganate ions? (F = 96,500 C • mol-1) MnO4-(aq) + 8H+(aq) + 5e- Mn2+(aq) +4H2O(l) E° = 1.51V Fe3+(aq) + e- Fe2+(aq) E° = 0.77V

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The equilibrium constant for the reaction of Ni2+ with Cd is 1.17 x 105.Calculate the free energy change for the reaction at 25oC.

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When the following redox equation is balanced using the smallest whole-number coefficients,what is the coefficient of NO2? Sn + HNO3 → SnO2 + NO2 + H2O (acidic solution)

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What mass of nickel may be electroplated by passing a constant current of 7.2 A through a solution of NiSO4 for 90.0 min?

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What quantity of charge is required to cause reduction of 0.20 mole of Cr3+ to Cr?

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If a substance is reduced,it must undergo a

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What is E°cell for a galvanic cell represented by the combination of the following half-reactions? 2Hg2+(aq) + 2e- Hg22+(aq) E°= 0.92V Cr3+(aq) + 3e- Cr(s) E°= -0.74V

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When the following redox equation is balanced with the smallest whole number coefficients,what is the coefficient of Sn(OH) 3-? Bi(OH) 3(s) + Sn(OH) 3-(aq) → Sn(OH) 62-(aq) + Bi(s) (basic solution)

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How many minutes would be required to electroplate 25.0 g of chromium by passing a constant current of 4.80 A through a solution containing CrCl3?

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What is the name given to the apparatus where oxidation occurs in a cell where electricity flows?

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What product forms at the cathode during the electrolysis of molten lithium iodide?

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Predict the products obtained from the electrolysis of a 1 M AlBr3 solution. Note that 2H2O(l) + 2e- → H2(g) +2OH-(aq) ,E° = -0.83 V O2(g) + 4H+(aq) + 4e- → 2H2O(l) ,E° = +1.23 V Br2(l) + 2e- → 2Br-(aq) E° = +1.08 V,and Al3+(aq) + 3e- → Al(s) E° = -1.66 V

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___________ occurs at the cathode in a galvanic cell.

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Correct Answer
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Correct Answer
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What is the equilibrium constant at 25°C for the following reaction? (R = 8.314 J/K • mol,F = 96,500 C • mol^-1) 2Cr(s) + 3Pb²⁺(aq) 3Pb(s) +2Cr³⁺(aq) E°_cell = 0.61V

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A voltaic cell prepared using aluminum and nickel has the following cell notation. Al(s) | Al³⁺(aq) || Ni²⁺(aq) | Ni(s) Which reaction occurs at the anode?

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Correct Answer
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Consider the reaction of iodine with manganese dioxide. 3I₂(s) + 2MnO₂(s) + 8OH^-(aq) 6I^-(aq) + 2MnO₄^-(aq) + 4H₂O(l) The equilibrium constant for the overall reaction is 8.3 × 10^-7.What is E°_cell for the reaction at 25°C? (R = 8.314 J/K • mol,F = 96,500 C • mol^-1)

Correct Answer
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Correct Answer
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What is ΔG° for the reaction of iron(II) ions with one mole of permanganate ions? (F = 96,500 C • mol^-1) MnO₄^-(aq) + 8H⁺(aq) + 5e^- Mn²⁺(aq) +4H₂O(l) E° = 1.51V Fe³⁺(aq) + e^- Fe²⁺(aq) E° = 0.77V

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The equilibrium constant for the reaction of Ni²⁺ with Cd is 1.17 x 10⁵.Calculate the free energy change for the reaction at 25^oC.

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When the following redox equation is balanced using the smallest whole-number coefficients,what is the coefficient of NO₂? Sn + HNO₃ → SnO₂ + NO₂ + H₂O (acidic solution)

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What mass of nickel may be electroplated by passing a constant current of 7.2 A through a solution of NiSO₄ for 90.0 min?

Correct Answer
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What quantity of charge is required to cause reduction of 0.20 mole of Cr³⁺ to Cr?

Correct Answer
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Correct Answer
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What is E°_cell for a galvanic cell represented by the combination of the following half-reactions? 2Hg²⁺(aq) + 2e^- Hg₂²⁺(aq) E°= 0.92V Cr³⁺(aq) + 3e^- Cr(s) E°= -0.74V

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When the following redox equation is balanced with the smallest whole number coefficients,what is the coefficient of Sn(OH) ₃^-? Bi(OH) ₃(s) + Sn(OH) ₃^-(aq) → Sn(OH) ₆^2-(aq) + Bi(s) (basic solution)

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How many minutes would be required to electroplate 25.0 g of chromium by passing a constant current of 4.80 A through a solution containing CrCl₃?

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Correct Answer
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Correct Answer
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Predict the products obtained from the electrolysis of a 1 M AlBr₃ solution. Note that 2H₂O(l) + 2e^- → H₂(g) +2OH^-(aq) ,E° = -0.83 V O₂(g) + 4H⁺(aq) + 4e^- → 2H₂O(l) ,E° = +1.23 V Br₂(l) + 2e^- → 2Br^-(aq) E° = +1.08 V,and Al³⁺(aq) + 3e^- → Al(s) E° = -1.66 V

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Correct Answer
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