Question 1

Derive the relationship between cell potential and the equilibrium constant?

Accepted Answer

The standard free-energy change and the ...

Question 2

The physical states of the reactants and the products in a half-reaction must be identical to those in the overall reaction.

Accepted Answer

A) True 
 B)False

Question 3

What is the purpose of a salt bridge in a galvanic cell?

Accepted Answer

A salt bridge is a U-shaped tube inserte...

Question 4

If the  E∘E ^ { \circ }E∘  of the galvanic cell is 1.24 V and the  E∘E ^ { \circ }E∘  of the cathode is 0.57, what is the  E∘E ^ { \circ }E∘  of the anode?

Accepted Answer

A)   -0.67 V
B)   -0.57 V
C)   1.81 V
D)   -1.81 V
E)   0.67 V

Question 5

Lithium-iodine batteries are disposable and cannot be recharged once they are discharged.

Accepted Answer

A) True 
 B)False

Question 6

If work is being done by a system on its surroundings, it is expressed as a positive number.

Accepted Answer

A) True 
 B)False

Question 7

The _____ is a battery that consists of a Leclanché cell adapted to operate under alkaline conditions.

Accepted Answer

The answer of The _____ is a battery that consists...

Question 8

_____ is a galvanic process by which metals deteriorate through oxidation.

Accepted Answer

The answer of _____ is a galvanic process by which...

Question 9

If the free-energy change for the reaction is -87.5 kJ and the cell potential is equal to 0.18 V, how many moles of electrons are used in the reaction? Given: F =  96,468 J/(V⋅mol) 96,468 \mathrm {~J} / (\mathrm { V } \cdot \mathrm { mol } ) 96,468 J/(V⋅mol)   .

Accepted Answer

A)   Two
B)   Three
C)   Four
D)   Five
E)   Six

Question 10

If the cell potential is equal to 0.240 V and the total charge transferred during the reaction is equal to 1.93×105   
 C/mol−	ext{C/mol}^{-}C/mol−  , what is the maximum work produced by the electrochemical cell?

Accepted Answer

A)   67.2 kJ/mol
B)   -46.3 kJ/mol
C)   27.8 kJ/mol
D)   80.5 kJ/mol
E)   -12.9 kJ/mol

Question 11

A voltaic cell consumes electrical energy from an external source.

Accepted Answer

A) True 
 B)False

Question 12

When using a galvanic cell to measure the concentration of a substance, the potential of the _____ is related to the concentration of the substance being measured.

Accepted Answer

The answer of When using a galvanic cell to measure...

Question 13

The oxidant is the species that loses electrons in the process.

Accepted Answer

A) True 
 B)False

Question 14

Explain fuel cells with an example. State its half-reactions.

Accepted Answer

A fuel cell is a galvanic cell that requ...

Question 15

Which of the following reactions occurs at the cathode during the formation of rust?

Accepted Answer

A)    O2(g) +4H+(aq) +4e−→2H2O(l) \mathrm { O } _ { 2 } ( g )  + 4 \mathrm { H } ^ { + } ( \mathrm { aq } )  + 4 \mathrm { e } ^ { - } \rightarrow 2 \mathrm { H } _ { 2 } \mathrm { O } ( \mathrm { l } ) O2​(g) +4H+(aq) +4e−→2H2​O(l)  
B)    Fe(s) →Fe2+(aq) +2e−\mathrm { Fe } ( \mathrm { s } )  \rightarrow \mathrm { Fe } ^ { 2 + } ( \mathrm { aq } )  + 2 e ^ { - }Fe(s) →Fe2+(aq) +2e− 
C)   Zn(s)  ? Zn2+(aq)  + 2e?
D)   2H2(g)  ? 4H+ + 4e?
E)    PbO2( s) +HSO4−(aq) +3H+(aq) +2e−→PbSO4( s) +2H2O(l) \mathrm { PbO } _ { 2 } ( \mathrm {~s} )  + \mathrm { HSO } _ { 4 } ^ { - } ( \mathrm { aq } )  + 3 \mathrm { H } ^ { + } ( \mathrm { aq } )  + 2 \mathrm { e } ^ { - } \rightarrow \mathrm { PbSO } _ { 4 } ( \mathrm {~s} )  + 2 \mathrm { H } _ { 2 } \mathrm { O } ( \mathrm { l } ) PbO2​( s) +HSO4−​(aq) +3H+(aq) +2e−→PbSO4​( s) +2H2​O(l)

Question 16

Explain the process of determining the oxidants and reductants based on the standard potentials of half-reactions.

Accepted Answer

All reactants that lie above the standar...

Question 17

A(n) _____ is an ionic substance or solution that allows ions to transfer between the electrode compartments, thereby maintaining the system's electrical neutrality.

Accepted Answer

The answer of A(n) _____ is an ionic substance or...

Question 18

The _____ of the cell is the difference in electrical potential between two half-reactions.

Accepted Answer

The answer of The _____ of the cell is the...

Question 19

A(n) _____ is a U-shaped tube inserted into both solutions of a galvanic cell that contains a concentrated liquid or gelled electrolyte and completes the circuit between the anode and the cathode.

Accepted Answer

The answer of A(n) _____ is a U-shaped tube inserted...

Question 20

The NiMH battery is more advantageous than the NiCad battery in that _____.

Accepted Answer

A)   it has a lower self-discharge rate
B)   it is insensitive to recharging memory
C)   it has an unlimited service life
D)   it requires lower maintenance
E)   it is less expensive

Exam 19: Electrochemistry

Derive the relationship between cell potential and the equilibrium constant?

Correct AnswerverifiedThe standard free-energy change and the ...View AnswerShow Answer

The NiMH battery is more advantageous than the NiCad battery in that _____.

Correct AnswerverifiedShow Answer

The _____ of the cell is the difference in electrical potential between two half-reactions.

Correct AnswerverifiedShow Answer

If work is being done by a system on its surroundings, it is expressed as a positive number.

Correct AnswerverifiedShow Answer

Explain fuel cells with an example. State its half-reactions.

Correct AnswerverifiedA fuel cell is a galvanic cell that requ...View AnswerShow Answer

_____ is a galvanic process by which metals deteriorate through oxidation.

Correct AnswerverifiedShow Answer

The _____ is a battery that consists of a Leclanché cell adapted to operate under alkaline conditions.

Correct AnswerverifiedShow Answer

If the free-energy change for the reaction is -87.5 kJ and the cell potential is equal to 0.18 V, how many moles of electrons are used in the reaction? Given: F = 96,468 J/(V⋅mol) 96,468 \mathrm {~J} / (\mathrm { V } \cdot \mathrm { mol } ) 96,468 J/(V⋅mol) .

Correct AnswerverifiedShow Answer

A(n) _____ is a U-shaped tube inserted into both solutions of a galvanic cell that contains a concentrated liquid or gelled electrolyte and completes the circuit between the anode and the cathode.

Correct AnswerverifiedShow Answer

If the E∘E ^ { \circ }E∘ of the galvanic cell is 1.24 V and the E∘E ^ { \circ }E∘ of the cathode is 0.57, what is the E∘E ^ { \circ }E∘ of the anode?

Correct AnswerverifiedShow Answer

If the cell potential is equal to 0.240 V and the total charge transferred during the reaction is equal to 1.93×105 C/mol−\text{C/mol}^{-}C/mol− , what is the maximum work produced by the electrochemical cell?

Correct AnswerverifiedShow Answer

The oxidant is the species that loses electrons in the process.

Correct AnswerverifiedShow Answer

Explain the process of determining the oxidants and reductants based on the standard potentials of half-reactions.

Correct AnswerverifiedAll reactants that lie above the standar...View AnswerShow Answer

A(n) _____ is an ionic substance or solution that allows ions to transfer between the electrode compartments, thereby maintaining the system's electrical neutrality.

Correct AnswerverifiedShow Answer

Which of the following reactions occurs at the cathode during the formation of rust?

Correct AnswerverifiedShow Answer

When using a galvanic cell to measure the concentration of a substance, the potential of the _____ is related to the concentration of the substance being measured.

Correct AnswerverifiedShow Answer

A voltaic cell consumes electrical energy from an external source.

Correct AnswerverifiedShow Answer

The physical states of the reactants and the products in a half-reaction must be identical to those in the overall reaction.

Correct AnswerverifiedShow Answer

What is the purpose of a salt bridge in a galvanic cell?

Correct AnswerverifiedA salt bridge is a U-shaped tube inserte...View AnswerShow Answer

Lithium-iodine batteries are disposable and cannot be recharged once they are discharged.

Correct AnswerverifiedShow Answer

Correct Answer
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The standard free-energy change and the ...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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A fuel cell is a galvanic cell that requ...
View Answer

Correct Answer
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Correct Answer
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If the free-energy change for the reaction is -87.5 kJ and the cell potential is equal to 0.18 V, how many moles of electrons are used in the reaction? Given: F = $96,468 \mathrm {~J} / (\mathrm { V } \cdot \mathrm { mol } )$ .

Correct Answer
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Correct Answer
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If the $E ^ { \circ }$ of the galvanic cell is 1.24 V and the $E ^ { \circ }$ of the cathode is 0.57, what is the $E ^ { \circ }$ of the anode?

Correct Answer
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If the cell potential is equal to 0.240 V and the total charge transferred during the reaction is equal to 1.93×10⁵ $\text{C/mol}^{-}$ , what is the maximum work produced by the electrochemical cell?

Correct Answer
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Correct Answer
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Correct Answer
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All reactants that lie above the standar...
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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A salt bridge is a U-shaped tube inserte...
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Correct Answer
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