Question 1

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) A) and E)
G) None of the above

Question 2

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) A) and E)
G) A) and D)

Question 3

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) A) and E)
G) A) and D)

Question 4

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) C) and D)
G) A) and B)

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) D) and E)
G) A) and D)

Question 6

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 7

________ occurs at the cathode in a galvanic cell.

Accepted Answer

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

Question 8

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) A) and C)
G) C) and D)

Question 9

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) A) and D)
G) D) and E)

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 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 D)
G) B) and E)

Question 12

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) C) and D)

Question 13

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) B) and C)

Question 14

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) None of the above
G) C) and E)

Question 15

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 C)
F) B) and D)

Question 16

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) A) and D)
G) A) and E)

Question 17

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) C) and D)
G) D) and E)

Question 18

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 D)
G) All of the above

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

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) None of the above
G) B) and D)

Exam 19: Electrochemistry

What is meant by SHE?

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

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

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

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

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

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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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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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Which equation is correct?

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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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________ occurs at the cathode in a galvanic cell.

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

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

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

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

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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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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 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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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 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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