Question 1

In balancing electrochemical half-reactions in acidic media, one can assume an excess of both water and OH-.

Accepted Answer

A) True 
 B)False

Question 2

The kinetics of uniform corrosion will speed up considerably in the presence of good electrical conducting salts such as NaCl

Accepted Answer

A) True 
 B)False

Question 3

Identify the correct balanced chemical equation for the cell: 2+( aq )  → Al3+( aq )  + Hg( l )  B)  2 Al( s )  + Hg2+( aq )  → 2 Al3+( aq )  + Hg( l )  C)  Al( s )  + 3 Hg2+( aq )  → Al3+( aq )  + 3 Hg( l )  D)  2 Al( s )  + 3 Hg2+( aq )  → 2 Al3+( aq )  + 3 Hg( l ) " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   Al( s )  + Hg2+( aq )  → Al3+( aq )  + Hg( l ) 
B)   2 Al( s )  + Hg2+( aq )  → 2 Al3+( aq )  + Hg( l ) 
C)   Al( s )  + 3 Hg2+( aq )  → Al3+( aq )  + 3 Hg( l ) 
D)   2 Al( s )  + 3 Hg2+( aq )  → 2 Al3+( aq )  + 3 Hg( l ) E) C) and D)
F) A) and B)

Question 4

The species undergoing reduction is referred to as the oxidizing agent.

Accepted Answer

A) True 
 B)False

Question 5

What is the E value for the Galvanic cell formed from these two half-reactions at these concentrations?

Accepted Answer

A)   1.00 V
B)   1.12 V
C)   1.24 V
D)   0.36 VE) B) and C)
F) B) and D)

Question 6

Electrolysis can be used to electroplate metals onto surfaces.

Accepted Answer

A) True 
 B)False

Question 7

What is the oxidation number of Cl in HClO4?

Accepted Answer

A)   1+
B)   2+
C)   7+
D)   8+E) B) and C)
F) A) and B)

Question 8

Electrolysis involves using an external current to drive an electrochemical reaction in a non-spontaneous direction.

Accepted Answer

A) True 
 B)False

Question 9

The salt bridge between 1/2 reactions maintains the electrical balance of a Galvanic cell. This bridge is filled with:

Accepted Answer

A)   strong electrolytes.
B)   inert carbon.
C)   weak electrolytes.
D)   interstitial membranes.E) A) and D)
F) None of the above

Question 10

What is the E value for the Galvanic cell formed from these two half-reactions at these concentrations?

Accepted Answer

A)   1.90 V
B)   1.95 V
C)   1.99 V
D)   2.20 VE) B) and C)
F) A) and B)

Question 11

All dry cell batteries are rechargeable.

Accepted Answer

A) True 
 B)False

Question 12

An oxidation occurs at the ____ of a Galvanic cell.

Accepted Answer

A)   intersection
B)   anode
C)   p-n junction
D)   cathodeE) A) and B)
F) A) and C)

Question 13

Single use, non-rechargeable batteries are referred to as:

Accepted Answer

A)   primary cells
B)   secondary cells
C)   tertiary cells
D)   electrolytic cellsE) A) and B)
F) B) and D)

Question 14

What is the E0 value for the Galvanic cell formed from these two half-reactions?
0 value for the Galvanic cell formed from these two half-reactions?   A)  −1 .43 V B)  +1.43 V C)  −0 .93 V D)  +0.93 V" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   −1 .43 V
B)   +1.43 V
C)   −0 .93 V
D)   +0.93 VE) A) and D)
F) None of the above

Question 15

Which mechanism is most energy efficient?

Accepted Answer

A)   internal combustion motor
B)   a voltaic fuel cell
C)   electricity from coal fired plantsD) B) and C)
E) A) and C)

Question 16

How long will it take to collect 1.0 L of H2 (g)  at STP in the electrolysis of 2.0 M HCl with a current of 4.25 A?

Accepted Answer

A)   15 min
B)   34 min
C)   2.8 hr
D)   11 hrE) A) and C)
F) B) and D)

Question 17

Copper has a greater tendency to corrode than does zinc.

Accepted Answer

A) True 
 B)False

Question 18

The formation of thin layers of material on the electrodes of a secondary cell will result in:

Accepted Answer

A)   an increase in the EMF of the battery.
B)   formation of explosive hydrates.
C)   shorter periods of usefulness between recharging sessions.
D)   the creation of j-p junction gaps at the electrode surfaces.E) A) and C)
F) A) and B)

Question 19

The Nernst equation describes the pH required to convert electrolytic reactions into spontaneous Galvanic cells.

Accepted Answer

A) True 
 B)False

Question 20

The SHE is assigned a voltage of ____ V.

Accepted Answer

A)   − 1.000
B)   1.000
C)   0.150
D)   0.000E) A) and B)
F) B) and C)

Exam 13: Electrochemistry

What is the E value for the Galvanic cell formed from these two half-reactions at these concentrations?

Correct AnswerverifiedShow Answer

An oxidation occurs at the ____ of a Galvanic cell.

Correct AnswerverifiedShow Answer

The formation of thin layers of material on the electrodes of a secondary cell will result in:

Correct AnswerverifiedShow Answer

Copper has a greater tendency to corrode than does zinc.

Correct AnswerverifiedShow Answer

The SHE is assigned a voltage of ____ V.

Correct AnswerverifiedShow Answer

The salt bridge between 1/2 reactions maintains the electrical balance of a Galvanic cell. This bridge is filled with:

Correct AnswerverifiedShow Answer

What is the E value for the Galvanic cell formed from these two half-reactions at these concentrations?

Correct AnswerverifiedShow Answer

In balancing electrochemical half-reactions in acidic media, one can assume an excess of both water and OH-.

Correct AnswerverifiedShow Answer

All dry cell batteries are rechargeable.

Correct AnswerverifiedShow Answer

How long will it take to collect 1.0 L of H2 (g) at STP in the electrolysis of 2.0 M HCl with a current of 4.25 A?

Correct AnswerverifiedShow Answer

The species undergoing reduction is referred to as the oxidizing agent.

Correct AnswerverifiedShow Answer

Electrolysis involves using an external current to drive an electrochemical reaction in a non-spontaneous direction.

Correct AnswerverifiedShow Answer

Which mechanism is most energy efficient?

Correct AnswerverifiedShow Answer

The Nernst equation describes the pH required to convert electrolytic reactions into spontaneous Galvanic cells.

Correct AnswerverifiedShow Answer

What is the E0 value for the Galvanic cell formed from these two half-reactions?

Correct AnswerverifiedShow Answer

Single use, non-rechargeable batteries are referred to as:

Correct AnswerverifiedShow Answer

Identify the correct balanced chemical equation for the cell:

Correct AnswerverifiedShow Answer

The kinetics of uniform corrosion will speed up considerably in the presence of good electrical conducting salts such as NaCl

Correct AnswerverifiedShow Answer

Electrolysis can be used to electroplate metals onto surfaces.

Correct AnswerverifiedShow Answer

What is the oxidation number of Cl in HClO4?

Correct AnswerverifiedShow Answer

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In balancing electrochemical half-reactions in acidic media, one can assume an excess of both water and OH^-.

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How long will it take to collect 1.0 L of H₂ (g) at STP in the electrolysis of 2.0 M HCl with a current of 4.25 A?

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What is the E⁰ value for the Galvanic cell formed from these two half-reactions?

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What is the oxidation number of Cl in HClO₄?

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