Chemistry: Matter and Change

Chapter 20: Electrochemistry

Standardized Test Practice

1
A cell is constructed by immersing a strip of lead in a 1.0M Pb(NO3)2 solution and a strip of silver in a 1.0M AgNO3 solution. The circuit is completed by a wire and a salt bridge. As the cell operates, the strip of silver gains mass (only silver), the strip of lead loses mass, and the concentration of lead ions increases in the solution around the lead strip. Which of the following represents the reaction that occurs at the cathode in this cell?
A)Pb2+ + 2e- → Pb
B)Pb → Pb2+ + 2e-
C)Ag+ + e- → Ag
D)Ag → Ag+ + e-
2
Under standard conditions, what is the standard cell potential for the cell?

Cd|Cu2+ || Cu2+|Cu?
A)+0.74 V
B)-0.74 V
C)0.06 V
D)-0.06 V
3
How many moles of electrons have been transferred between the species in the following reaction?

2Cr3+(aq) + 3Cu(s) → 2Cr(s) + 3Cu2+(aq)
A)2
B)3
C)4
D)6
4
What is the reduction potential for the standard hydrogen electrode?

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A)+1.000 volts
B)-1.000 volts
C)0.000 volts
D)1.000 moles
5
On the chart shown, where would the reaction from Ag+ | Ag be found?

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A)above copper
B)between copper and hydrogen
C)between hydrogen and zinc
D)below zinc
6
What is the anode reaction when a NiCad battery is used to generate electric current?

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A)oxidation of cadmium in the presence of an acid
B)oxidation or cadmium in the presence of a base
C)reduction of cadmium in the presence of an acid
D)reduction of cadmium in the presence of a base
7
A redox reaction that is not easily reversed is the source of electric energy in a(n) _______.
A)primary battery
B)secondary battery
C)fuel cell
D)electrolytic cell
8
The pieces of metal that are placed on the outside of ships to help prevent corrosion are _________.
A)galvanized metals
B)sacrificial cathodes
C)sacrificial anodes
D)electrolyzed metals
9
In a lead-acid battery, what substance is generated during recharging?

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A)lead
B)lead oxide
C)hydrogen
D)sulfuric acid
10
Why do fuel cells not run down as batteries do?

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A)Fuel cells make their own fuel.
B)Fuel is provided from an outside source.
C)Fuel cells do not use chemical reactions.
D)Fuel cells do not require an electrolyte.
11
The use of electric energy to bring about a chemical reaction is ____________.
A)a galvanic cell
B)corrosion
C)electrolysis
D)spontaneous combustion
12
One example of electrolysis is ________.

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A)the flow of current from a primary battery
B)the recharging of a secondary battery
C)corrosion of an iron pipe
D)the addition of hydrogen gas to a fuel cell
13
Electroplating is an example of __________.
A)a galvanic cell
B)a primary battery
C)a fuel cell
D)electrolysis
14
In a Down's cell, what is the electrolyte?

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A)water
B)molten NaCl
C)carbon
D)iron
15
In the electroplating cell shown, what is being reduced?

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A)silver metal
B)silver ions
C)nitrate ions
D)electrons
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