Question 1

Which is the half-reaction at the anode in a lead storage battery?

Accepted Answer

A)  Pb(s) + PbO2(s) + 4H+(aq) + 2SO42-(aq) → 2PbSO4(s) + 2H2O(l) 
B)  PbO2(s) + 4H+(aq) + 2SO42-(aq) + 2e- → PbSO4(s) + 2H2O(l) 
C)  Pb(s) + SO42-(aq) → PbSO4(s) + 2e- 
D)  Pb(s) → Pb(s) + 2e- 
E)  H2(g) → 2H+(aq) + 2e- 
A)  Pb(s) + PbO2(s) + 4H+(aq) + 2SO42-(aq) → 2PbSO4(s) + 2H2O(l) 
B)  PbO2(s) + 4H+(aq) + 2SO42-(aq) + 2e- → PbSO4(s) + 2H2O(l) 
C)  Pb(s) + SO42-(aq) → PbSO4(s) + 2e- 
D)  Pb(s) → Pb(s) + 2e- 
E)  H2(g) → 2H+(aq) + 2e-

Question 2

Based on the following electrochemical cell, what is the standard reduction potential of metal M at 298 K? (R = 8.314 J/K • mol, F = 96500 C/mol)

Accepted Answer

A)  -0.54 V 
B)  +0.60 V 
C)  -0.30 V 
D)  +0.56 V 
E)  -0.28 V 
A)  -0.54 V 
B)  +0.60 V 
C)  -0.30 V 
D)  +0.56 V 
E)  -0.28 V

Question 3

When the following equation is balanced with the lowest whole number coefficients, the coefficients are: Cu(s) + H+(aq) + NO3-(aq) → NO(g) + H2O(l) + Cu2+(aq)

Accepted Answer

A)  1, 2, 1, 1, 1, 1 
B)  3, 2, 1, 1, 1, 3 
C)  3, 2, 4, 2, 4, 3 
D)  1, 8, 2, 2, 4, 1 
E)  3, 8, 2, 2, 4, 3 
A)  1, 2, 1, 1, 1, 1 
B)  3, 2, 1, 1, 1, 3 
C)  3, 2, 4, 2, 4, 3 
D)  1, 8, 2, 2, 4, 1 
E)  3, 8, 2, 2, 4, 3

Question 4

Given the following standard reduction potentials in acid solution   write the formula of the strongest reducing agent.

Accepted Answer

The answer of Given the following standard reduction potentials in...

Question 5

What is the purpose of a salt bridge in an electrochemical cell?

Accepted Answer

A)  A salt bridge provides electrical contact between the electrodes that make up the cell. 
B)  A salt bridge carries electrons between the cathode and anode. 
C)  A salt bridge insulates the two electrodes. 
D)  A salt bridge allows the electrolyte solution to siphon from one side of the cell to the other so the levels remain equal. 
E)  A salt bridge allows electrolyte to flow from one half-cell to the other in order to maintain electroneutrality. 
A)  A salt bridge provides electrical contact between the electrodes that make up the cell. 
B)  A salt bridge carries electrons between the cathode and anode. 
C)  A salt bridge insulates the two electrodes. 
D)  A salt bridge allows the electrolyte solution to siphon from one side of the cell to the other so the levels remain equal. 
E)  A salt bridge allows electrolyte to flow from one half-cell to the other in order to maintain electroneutrality.

Question 6

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)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 7

A certain electrochemical cell has for its cell reaction: Zn + HgO → ZnO + Hg
Which is the half-reaction occurring at the anode?

Accepted Answer

A)  HgO + 2e- → Hg + O2- 
B)  Zn2++ 2e- → Zn 
C)  Zn → Zn2+ + 2e- 
D)  ZnO + 2e- → Zn 
A)  HgO + 2e- → Hg + O2- 
B)  Zn2++ 2e- → Zn 
C)  Zn → Zn2+ + 2e- 
D)  ZnO + 2e- → Zn

Question 8

________ occurs at the cathode in a galvanic cell.

Accepted Answer

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

Question 9

What is the half-reaction that occurs at the cathode during the electrolysis of an aqueous sodium iodide solution?

Accepted Answer

A)  Na+ + e- → 
B)  O2(g) + 4H+(aq) + 4e- → 2H2O(l) 
C)  2H2O + 2e- → H2 + 2OH- 
D)  I2 + 2e- → 2I- 
E)  2I- → I2 + 2e- 
A)  Na+ + e- → 
B)  O2(g) + 4H+(aq) + 4e- → 2H2O(l) 
C)  2H2O + 2e- → H2 + 2OH- 
D)  I2 + 2e- → 2I- 
E)  2I- → I2 + 2e-

Question 10

A SHE has the acid concentration of 1 M and the H2 pressure is 1 atm.

Accepted Answer

A) True 
 B)False

Question 11

Which equation is correct?

Accepted Answer

A)  E = -(RT/nF) lnK 
B)  E° = (RT/nF) lnK 
C)  E° = (RT/nF) lnQ 
D)  E = -(RT/nF) lnQ 
E)  E = E° + lnQ 
A)  E = -(RT/nF) lnK 
B)  E° = (RT/nF) lnK 
C)  E° = (RT/nF) lnQ 
D)  E = -(RT/nF) lnQ 
E)  E = E° + lnQ

Question 12

Based on the data presented below, which is the strongest reducing agent?

Accepted Answer

A)  Fe3+ 
B)  Fe2+ 
C)  Br- 
D)  Al3+ 
E)  Al(s) 
A)  Fe3+ 
B)  Fe2+ 
C)  Br- 
D)  Al3+ 
E)  Al(s)

Question 13

Based on the following electrochemical cell, which statement is true?

Accepted Answer

A)  Al(s) is oxidized and is the anode. 
B)  Al(s) is oxidized and is the cathode. 
C)  Cd(s) is oxidized and is the anode. 
D)  Cd(s) is oxidized and is the cathode. 
E)  No reaction occurs because E°cell < 0. 
A)  Al(s) is oxidized and is the anode. 
B)  Al(s) is oxidized and is the cathode. 
C)  Cd(s) is oxidized and is the anode. 
D)  Cd(s) is oxidized and is the cathode. 
E)  No reaction occurs because E°cell < 0.

Question 14

What is the equilibrium constant at 25°C for the following reaction? (R = 8.314 J/K • mol, F = 96,500 C • mol-1)

Accepted Answer

A)  1.2 × 105 
B)  1.4 × 1010 
C)  8.6 × 10-6 
D)  7.1 × 10-11 
E)  2.3 × 1023 
A)  1.2 × 105 
B)  1.4 × 1010 
C)  8.6 × 10-6 
D)  7.1 × 10-11 
E)  2.3 × 1023

Question 15

Given the following standard reduction potentials,   calculate the solubility product of AgCN at 25°C.

Accepted Answer

A)  4.3 × 10-14 
B)  2.3 × 1013 
C)  2.1 × 10-14 
D)  5.1 × 1013 
E)  None of these choices is correct. 
A)  4.3 × 10-14 
B)  2.3 × 1013 
C)  2.1 × 10-14 
D)  5.1 × 1013 
E)  None of these choices is correct.

Question 16

What is E°cell for the following reaction? 2Fe2+(aq) + Cd2+(aq) → 2Fe3+(aq) + Cd(s)

Accepted Answer

A)  -0.37 V 
B)  0.37 V 
C)  -1.17 V 
D)  1.17 V 
E)  None of these choices is correct 
A)  -0.37 V 
B)  0.37 V 
C)  -1.17 V 
D)  1.17 V 
E)  None of these choices is correct

Question 17

What is meant by SHE?

Accepted Answer

A)  Shared half electrodes 
B)  Shifting half of the electricity 
C)  Standard hydrogen electrode 
D)  Small helium electrode 
E)  Standard Hg electrode 
A)  Shared half electrodes 
B)  Shifting half of the electricity 
C)  Standard hydrogen electrode 
D)  Small helium electrode 
E)  Standard Hg electrode

Question 18

E > 0 and ΔG < 0 for a spontaneous process.

Accepted Answer

A) True 
 B)False

Question 19

Consider the following balanced redox reaction. 3CuO(s) + 2NH3(aq) → N2(g) + 3H2O(l) + 3Cu(s)
Which of the following statements is true?

Accepted Answer

A)  CuO(s) is the oxidizing agent and copper is reduced. 
B)  CuO(s) is the oxidizing agent and copper is oxidized. 
C)  CuO(s) is the reducing agent and copper is oxidized. 
D)  CuO(s) is the reducing agent and copper is reduced. 
E)  CuO(s) is the oxidizing agent and N2(g) is the reducing agent. 
A)  CuO(s) is the oxidizing agent and copper is reduced. 
B)  CuO(s) is the oxidizing agent and copper is oxidized. 
C)  CuO(s) is the reducing agent and copper is oxidized. 
D)  CuO(s) is the reducing agent and copper is reduced. 
E)  CuO(s) is the oxidizing agent and N2(g) is the reducing agent.

Question 20

Which equation is correct?

Accepted Answer

A)  E°cell = E°anode - E°cathode 
B)  E°cell = E°cathode + E°anode 
C)  E°cell = E°cathode - E°anode 
D)  E°cell = E°cathode /E°anode 
A)  E°cell = E°anode - E°cathode 
B)  E°cell = E°cathode + E°anode 
C)  E°cell = E°cathode - E°anode 
D)  E°cell = E°cathode /E°anode

Exam 19: Electrochemistry

Which is the half-reaction at the anode in a lead storage battery?

Based on the following electrochemical cell, what is the standard reduction potential of metal M at 298 K? (R = 8.314 J/K • mol, F = 96500 C/mol)

When the following equation is balanced with the lowest whole number coefficients, the coefficients are: Cu(s) + H+(aq) + NO3-(aq) → NO(g) + H2O(l) + Cu2+(aq)

Given the following standard reduction potentials in acid solution write the formula of the strongest reducing agent.

What is the purpose of a salt bridge in an electrochemical cell?

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)

A certain electrochemical cell has for its cell reaction: Zn + HgO → ZnO + Hg Which is the half-reaction occurring at the anode?

________ occurs at the cathode in a galvanic cell.

What is the half-reaction that occurs at the cathode during the electrolysis of an aqueous sodium iodide solution?

A SHE has the acid concentration of 1 M and the H2 pressure is 1 atm.

Which equation is correct?

Based on the data presented below, which is the strongest reducing agent?

Based on the following electrochemical cell, which statement is true?

What is the equilibrium constant at 25°C for the following reaction? (R = 8.314 J/K • mol, F = 96,500 C • mol-1)

Given the following standard reduction potentials, calculate the solubility product of AgCN at 25°C.

What is E°cell for the following reaction? 2Fe2+(aq) + Cd2+(aq) → 2Fe3+(aq) + Cd(s)

What is meant by SHE?

E > 0 and ΔG < 0 for a spontaneous process.

Consider the following balanced redox reaction. 3CuO(s) + 2NH3(aq) → N2(g) + 3H2O(l) + 3Cu(s) Which of the following statements is true?

Which equation is correct?

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When the following equation is balanced with the lowest whole number coefficients, the coefficients are: Cu(s) + H⁺(aq) + NO₃^-(aq) → NO(g) + H₂O(l) + Cu²⁺(aq)

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)

A SHE has the acid concentration of 1 M and the H₂ pressure is 1 atm.

What is the equilibrium constant at 25°C for the following reaction? (R = 8.314 J/K • mol, F = 96,500 C • mol^-1)

What is E°_cell for the following reaction? 2Fe²⁺(aq) + Cd²⁺(aq) → 2Fe³⁺(aq) + Cd(s)

Consider the following balanced redox reaction. 3CuO(s) + 2NH₃(aq) → N₂(g) + 3H₂O(l) + 3Cu(s) Which of the following statements is true?