Question 1

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

Accepted Answer

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

Question 2

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

Accepted Answer

A) -0.18 V 
B) 0.18 V 
C) 1.28 V 
D) 1.66 V 
E) 2.12 V 
A) -0.18 V 
B) 0.18 V 
C) 1.28 V 
D) 1.66 V 
E) 2.12 V

Question 3

Which is the Nernst equation?

Accepted Answer

A)    
B)    
C)    
D)    
E) None of these statements is correct. 
A)    
B)    
C)    
D)    
E) None of these statements is correct.

Question 4

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

Question 5

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 Ni 
A) 0.20 g Ni 
B) 0.40 g Ni 
C) 12 g Ni 
D) 24 g Ni 
E) 47 g Ni

Question 6

A lead-storage battery is not rechargeable.

Accepted Answer

A) True 
 B)False

Question 7

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

Accepted Answer

A) -71.4 kJ 
B) -286 kJ 
C) -357 kJ 
D) -428 kJ 
E) None of these choices is correct. 
A) -71.4 kJ 
B) -286 kJ 
C) -357 kJ 
D) -428 kJ 
E) None of these choices is correct.

Question 8

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 cell 
A) Cathode 
B) Electrode 
C) Galvanic cell 
D) Anode 
E) Voltaic cell

Question 9

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. 
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.

Question 10

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

Question 11

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

Question 12

Which element is associated with the term "galvanized"?

Accepted Answer

A) Ga 
B) Zn 
C) Cd 
D) Hg 
E) Pb 
A) Ga 
B) Zn 
C) Cd 
D) Hg 
E) Pb

Question 13

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)

Accepted Answer

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

Question 14

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 C 
A) 0.60 C 
B) 3.0 C 
C) 1.9 × 104 C 
D) 5.8 × 104 C 
E) 9.7 × 104 C

Question 15

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 16

___________ occurs at the cathode in a galvanic cell.

Accepted Answer

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

Question 17

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) 
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)

Question 18

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

Question 19

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) 12 
A) 1 
B) 2 
C) 3 
D) 6 
E) 12

Question 20

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 kJ 
A) -12.6 kJ 
B) -28.9 kJ 
C) 2.43 kJ 
D) 28.9 kJ 
E) 12.6 kJ

Exam 19: Electrochemistry

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

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

Which is the Nernst equation?

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?

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?

A lead-storage battery is not rechargeable.

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

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

Which statement is correct?

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

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

Which element is associated with the term "galvanized"?

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)

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

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)

___________ occurs at the cathode in a galvanic cell.

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?

If a substance is reduced,it must undergo a

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)

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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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

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

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?

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?

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

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

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)

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

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 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?

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)

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.