Question 1

What is the E °\degree° cell for the cell represented by the combination of the following half-reactions? cell for the cell represented by the combination of the following half-reactions?   A)  -0.398 V B)  -2.380 V C)  0.398 V D)  2.380 V E)  None of these choices is correct. " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   -0.398 V
B)   -2.380 V
C)   0.398 V
D)   2.380 V
E)   None of these choices is correct. F) D) and E)
G) A) and C)

Question 2

Chromium metal is electroplated from acidic aqueous solutions containing the dichromate ion, Cr2O72¯. What is the minimum time needed to plate out 10.0 g of chromium metal from such a solution, if the current is 50.0 A?

Accepted Answer

A)   6.2 minutes
B)   12.4 minutes
C)   18.6 minutes
D)   24.7 minute
E)   37.1 minutesF) B) and C)
G) A) and E)

Question 3

A much-studied cell in electrochemistry has the following cell notation:  Bearing in mind that HCl(aq) consists of H+(aq) and Cl¯(aq), and that this solution is in contact with both electrodes (there is no salt bridge), write down balanced equations for
A) the anode half-reaction.
B) the cathode half-reaction.
C) the cell reaction.

Accepted Answer

a. 11ec9252_5a81_4f64_b435_411...

Question 4

Electrons are produced at the cathode of a voltaic cell.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following elements can be isolated by electrolysis of the aqueous salt shown?

Accepted Answer

A)   phosphorus from K3PO4(aq) 
B)   sodium from NaBr(aq) 
C)   aluminum from AlCl3(aq) 
D)   fluorine from KF(aq) 
E)   iodine from NaI(aq) F) A) and E)
G) C) and D)

Question 6

Explain what is meant by a fuel cell. Provide a balanced equation to represent the reaction in any fuel cell of your choice.

Accepted Answer

A fuel cell is a voltaic cell in which t...

Question 7

If the electrodes of a voltaic cell are connected with an external wire, electrons will flow in this wire from the cathode to the anode.

Accepted Answer

A) True 
 B)False

Question 8

Calculate the potential of a voltaic cell (E °\degree° cell)  if it is required to do 5.43 * 10¯3 kJ of work when a charge of 2.50 C is transferred.

Accepted Answer

A)   2.17* 103 V
B)   2.17 * 10¯3 V
C)   2.17 V
D)   13.6 V
E)   1.36 * 10¯2 V F) A) and C)
G) A) and E)

Question 9

A voltaic cell consists of a Ag/Ag+ electrode (E °\degree° = 0.80 V)  and a Fe2+/Fe3+ electrode (E °\degree°  = 0.77 V)  with the following initial molar concentrations: [Fe2+] = 0.30 M; [Fe3+] = 0.10 M; [Ag+] = 0.30 M. What is the equilibrium concentration of Fe3+? (Assume the anode and cathode solutions are of equal volume, and a temperature of 25 °\degree° C.)

Accepted Answer

A)   0.030 M
B)   0.043 M
C)   0.085 M
D)   0.11 M
E)   0.17 M F) None of the above
G) All of the above

Question 10

Electrolytic cells utilize electrical energy to drive non-spontaneous redox reactions.

Accepted Answer

A) True 
 B)False

Question 11

A voltaic cell consists of a Cd/Cd2+ electrode (E °\degree°  = -0.40 V)  and a Fe/Fe2+ electrode (E °\degree° = -0.44 V) . If Ecell = 0 and the temperature is 25 °\degree° C, what is the ratio [Fe2+]/[Cd2+]?

Accepted Answer

A)   2 *101
B)   1 *101
C)   1
D)   1 *10¯1
E)   5 *10¯2 F) A) and E)
G) None of the above

Question 12

A secondary cell (battery) can operate either as a galvanic or an electrolytic cell.

Accepted Answer

A) True 
 B)False

Question 13

A buried iron pipe can be protected against corrosion by connecting it to a rod of copper.

Accepted Answer

A) True 
 B)False

Question 14

Write down equations representing the anode half-reaction, the cathode half-reaction and the overall cell reaction for the lead-acid battery.

Accepted Answer

The answer of Write down equations representing the anode half-reaction,...

Question 15

Calculate E °\degree° cell and indicate whether the overall reaction shown is spontaneous or nonspontaneous. cell and indicate whether the overall reaction shown is spontaneous or nonspontaneous.   Overall reaction:   A)  E \degree cell = -1.23 V, spontaneous B)  E \degree cell = -1.23 V, nonspontaneous C)  E \degree cell = 1.23 V, spontaneous D)  E \degree cell = 1.23 V, nonspontaneous E)  E \degree cell = -0.05 V, nonspontaneous " class="answers-bank-image d-inline" rel="preload" > Overall reaction: cell and indicate whether the overall reaction shown is spontaneous or nonspontaneous.   Overall reaction:   A)  E \degree cell = -1.23 V, spontaneous B)  E \degree cell = -1.23 V, nonspontaneous C)  E \degree cell = 1.23 V, spontaneous D)  E \degree cell = 1.23 V, nonspontaneous E)  E \degree cell = -0.05 V, nonspontaneous " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   E °\degree° cell = -1.23 V, spontaneous
B)   E °\degree° cell = -1.23 V, nonspontaneous
C)   E °\degree° cell = 1.23 V, spontaneous
D)   E °\degree° cell = 1.23 V, nonspontaneous
E)   E °\degree° cell = -0.05 V, nonspontaneous F) B) and D)
G) None of the above

Question 16

A concentration cell consists of two Zn/Zn2+ electrodes. The electrolyte in compartment A is 0.10 M Zn(NO3) 2 and in compartment B is 0.60 M Zn(NO3) 2. What is the voltage of the cell at 25 °\degree° C?

Accepted Answer

A)   0.010 V
B)   0.020 V
C)   0.023 V
D)   0.046 V
E)   None of these choices is correct. F) A) and B)
G) A) and D)

Question 17

Which, if any, of the following metals would be capable of acting as a sacrificial anode when used with iron pipe? E °\degree° Fe = -0.44 V; all E °\degree°  values refer to the M2+/M half-cell reactions.

Accepted Answer

A)   copper, Cu, E °\degree°  = 0.15 V
B)   cobalt, Co, E °\degree°  = -0.28 V
C)   chromium, Cr, E °\degree°  = -0.74 V
D)   tin, Sn, E °\degree°  = -0.14 V
E)   None of these metals would be capable of acting as a sacrificial anode with iron. F) A) and D)
G) A) and E)

Question 18

In the shorthand notation for cells, a single vertical line represents a salt bridge.

Accepted Answer

A) True 
 B)False

Question 19

The line notation, Pt | H2(g)  | H+(aq)  || Cu2+(aq)  | Cu(s) , indicates that

Accepted Answer

A)   copper metal is a product of the cell reaction.
B)   hydrogen gas (H2)  is a product of the cell reaction.
C)   Cu is the anode.
D)   Pt is the cathode.
E)   Cu2+ is the reducing agent.F) C) and E)
G) C) and D)

Question 20

Which of the following statements about voltaic and electrolytic cells is correct?

Accepted Answer

A)   The electrons in the external wire flow from cathode to anode in both types of cell.
B)   Oxidation occurs at the cathode only in a voltaic cell.
C)   The free energy change,  Δ\DeltaΔ G, is negative for an electrolytic cell.
D)   The cathode is labeled as positive (+)  in a voltaic cell but negative (-)  in an electrolytic cell.
E)   Reduction occurs at the anode in an electrolytic cell. F) B) and E)
G) A) and B)

Exam 21: Electrochemistry: Chemical Change and Electrical Work

Correct Answer
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Which of the following elements can be isolated by electrolysis of the aqueous salt shown?

Correct Answer
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Chromium metal is electroplated from acidic aqueous solutions containing the dichromate ion, Cr₂O₇²¯. What is the minimum time needed to plate out 10.0 g of chromium metal from such a solution, if the current is 50.0 A?

Correct Answer
verified

In the shorthand notation for cells, a single vertical line represents a salt bridge.

Correct Answer
verified

Correct Answer
verified
a. 11ec9252_5a81_4f64_b435_411...
View Answer

A secondary cell (battery) can operate either as a galvanic or an electrolytic cell.

Correct Answer
verified

Electrons are produced at the cathode of a voltaic cell.

Correct Answer
verified

Explain what is meant by a fuel cell. Provide a balanced equation to represent the reaction in any fuel cell of your choice.

Correct Answer
verified
A fuel cell is a voltaic cell in which t...
View Answer

A buried iron pipe can be protected against corrosion by connecting it to a rod of copper.

Correct Answer
verified

Correct Answer
verified

A voltaic cell consists of a Cd/Cd²⁺ electrode (E $\degree$ = -0.40 V) and a Fe/Fe²⁺ electrode (E $\degree$ = -0.44 V) . If E_cell = 0 and the temperature is 25 $\degree$ C, what is the ratio [Fe²⁺]/[Cd²⁺]?

Correct Answer
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If the electrodes of a voltaic cell are connected with an external wire, electrons will flow in this wire from the cathode to the anode.

Correct Answer
verified

Calculate the potential of a voltaic cell (E $\degree$ _cell) if it is required to do 5.43 * 10¯³ kJ of work when a charge of 2.50 C is transferred.

Correct Answer
verified

Electrolytic cells utilize electrical energy to drive non-spontaneous redox reactions.

Correct Answer
verified

Which, if any, of the following metals would be capable of acting as a sacrificial anode when used with iron pipe? E $\degree$ _Fe = -0.44 V; all E $\degree$ values refer to the M²⁺/M half-cell reactions.

Correct Answer
verified

The line notation, Pt | H₂(g) | H⁺(aq) || Cu²⁺(aq) | Cu(s) , indicates that

Correct Answer
verified

Write down equations representing the anode half-reaction, the cathode half-reaction and the overall cell reaction for the lead-acid battery.

Correct Answer
verified

Which of the following statements about voltaic and electrolytic cells is correct?

Correct Answer
verified

Correct Answer
verified

A concentration cell consists of two Zn/Zn²⁺ electrodes. The electrolyte in compartment A is 0.10 M Zn(NO₃) ₂ and in compartment B is 0.60 M Zn(NO₃) ₂. What is the voltage of the cell at 25 $\degree$ C?

Correct Answer
verified

Exam 21: Electrochemistry: Chemical Change and Electrical Work

Calculate E °\degree° cell and indicate whether the overall reaction shown is spontaneous or nonspontaneous. Overall reaction:

Correct AnswerverifiedShow Answer

Which of the following elements can be isolated by electrolysis of the aqueous salt shown?

Correct AnswerverifiedShow Answer

Chromium metal is electroplated from acidic aqueous solutions containing the dichromate ion, Cr2O72¯. What is the minimum time needed to plate out 10.0 g of chromium metal from such a solution, if the current is 50.0 A?

Correct AnswerverifiedShow Answer

In the shorthand notation for cells, a single vertical line represents a salt bridge.

Correct AnswerverifiedShow Answer

Correct Answerverifieda. 11ec9252_5a81_4f64_b435_411...View AnswerShow Answer

A secondary cell (battery) can operate either as a galvanic or an electrolytic cell.

Correct AnswerverifiedShow Answer

Electrons are produced at the cathode of a voltaic cell.

Correct AnswerverifiedShow Answer

Explain what is meant by a fuel cell. Provide a balanced equation to represent the reaction in any fuel cell of your choice.

Correct AnswerverifiedA fuel cell is a voltaic cell in which t...View AnswerShow Answer

A buried iron pipe can be protected against corrosion by connecting it to a rod of copper.

Correct AnswerverifiedShow Answer

What is the E °\degree° cell for the cell represented by the combination of the following half-reactions?

Correct AnswerverifiedShow Answer

A voltaic cell consists of a Cd/Cd2+ electrode (E °\degree° = -0.40 V) and a Fe/Fe2+ electrode (E °\degree° = -0.44 V) . If Ecell = 0 and the temperature is 25 °\degree° C, what is the ratio [Fe2+]/[Cd2+]?

Correct AnswerverifiedShow Answer

If the electrodes of a voltaic cell are connected with an external wire, electrons will flow in this wire from the cathode to the anode.

Correct AnswerverifiedShow Answer

Calculate the potential of a voltaic cell (E °\degree° cell) if it is required to do 5.43 * 10¯3 kJ of work when a charge of 2.50 C is transferred.

Correct AnswerverifiedShow Answer

Electrolytic cells utilize electrical energy to drive non-spontaneous redox reactions.

Correct AnswerverifiedShow Answer

Which, if any, of the following metals would be capable of acting as a sacrificial anode when used with iron pipe? E °\degree° Fe = -0.44 V; all E °\degree° values refer to the M2+/M half-cell reactions.

Correct AnswerverifiedShow Answer

The line notation, Pt | H2(g) | H+(aq) || Cu2+(aq) | Cu(s) , indicates that

Correct AnswerverifiedShow Answer

Write down equations representing the anode half-reaction, the cathode half-reaction and the overall cell reaction for the lead-acid battery.

Correct AnswerverifiedShow Answer

Which of the following statements about voltaic and electrolytic cells is correct?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A concentration cell consists of two Zn/Zn2+ electrodes. The electrolyte in compartment A is 0.10 M Zn(NO3) 2 and in compartment B is 0.60 M Zn(NO3) 2. What is the voltage of the cell at 25 °\degree° C?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Chromium metal is electroplated from acidic aqueous solutions containing the dichromate ion, Cr₂O₇²¯. What is the minimum time needed to plate out 10.0 g of chromium metal from such a solution, if the current is 50.0 A?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
a. 11ec9252_5a81_4f64_b435_411...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A fuel cell is a voltaic cell in which t...
View Answer

Correct Answer
verified

Correct Answer
verified

A voltaic cell consists of a Cd/Cd²⁺ electrode (E $\degree$ = -0.40 V) and a Fe/Fe²⁺ electrode (E $\degree$ = -0.44 V) . If E_cell = 0 and the temperature is 25 $\degree$ C, what is the ratio [Fe²⁺]/[Cd²⁺]?

Correct Answer
verified

Correct Answer
verified

Calculate the potential of a voltaic cell (E $\degree$ _cell) if it is required to do 5.43 * 10¯³ kJ of work when a charge of 2.50 C is transferred.

Correct Answer
verified

Correct Answer
verified

Which, if any, of the following metals would be capable of acting as a sacrificial anode when used with iron pipe? E $\degree$ _Fe = -0.44 V; all E $\degree$ values refer to the M²⁺/M half-cell reactions.

Correct Answer
verified

The line notation, Pt | H₂(g) | H⁺(aq) || Cu²⁺(aq) | Cu(s) , indicates that

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A concentration cell consists of two Zn/Zn²⁺ electrodes. The electrolyte in compartment A is 0.10 M Zn(NO₃) ₂ and in compartment B is 0.60 M Zn(NO₃) ₂. What is the voltage of the cell at 25 $\degree$ C?

Correct Answer
verified