Question 1

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) B) and D)

Question 2

What is the equilibrium constant at 25°C for the following reaction? (R = 8.314 J/K • mol, F = 96,500 C • mol-1)  -1)    A)  1.2 × 105 B)  1.4 × 1010 C)  8.6 × 10-6 D)  7.1 × 10-11 E)  2.3 × 1023" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

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

Question 3

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° + lnQF) None of the above
G) B) and E)

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

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.F) All of the above
G) A) and D)

Question 6

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- → ZnE) A) and B)
F) None of the above

Question 7

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.F) None of the above
G) A) and B)

Question 8

Given the following standard reduction potentials, -14 B)  2.3 × 1013 C)  2.1 × 10-14 D)  5.1 × 1013 E)  None of these choices is correct." class="answers-bank-image d-inline" rel="preload" > 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.F) A) and B)
G) B) and C)

Question 9

What is E°cell for the following reaction? 2Fe2+(aq)  + Cd2+(aq)  → 2Fe3+(aq)  + Cd(s)  cell for the following reaction? 2Fe2+(aq)  + Cd2+(aq)  → 2Fe3+(aq)  + Cd(s)    A)  -0.37 V B)  0.37 V C)  -1.17 V D)  1.17 V E)  None of these choices is correct" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   -0.37 V
B)   0.37 V
C)   -1.17 V
D)   1.17 V
E)   None of these choices is correctF) C) and D)
G) A) and E)

Question 10

________ occurs at the cathode in a galvanic cell.

Accepted Answer

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

Question 11

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 12

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, 3F) All of the above
G) A) and C)

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

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

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.F) All of the above
G) None of the above

Question 15

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 electrodeF) All of the above
G) None of the above

Question 16

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°anodeE) A) and B)
F) A) and C)

Question 17

What is the half-reaction that occurs at the cathode during the electrolysis of an aqueous sodium iodide solution? + + e- → B)  O2(g)  + 4H+(aq)  + 4e- → 2H2O(l)  C)  2H2O + 2e- → H2 + 2OH- D)  I2 + 2e- → 2I- E)  2I- → I2 + 2e-" class="answers-bank-image d-inline" rel="preload" >

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-F) B) and E)
G) A) and B)

Question 18

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 VF) None of the above
G) A) and D)

Question 19

Based on the data presented below, which is the strongest reducing agent? 3+ B)  Fe2+ C)  Br- D)  Al3+ E)  Al(s) " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

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

Question 20

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-F) A) and E)
G) A) and B)

Exam 19: Electrochemistry

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

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

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

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Which equation is correct?

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

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

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

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Which equation is correct?

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________ occurs at the cathode in a galvanic cell.

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

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What is meant by SHE?

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

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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)

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

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

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

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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)

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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)

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

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

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

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

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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)

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

Correct Answer
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