Chemistry Concepts and Applications

Chapter 17: Electrochemistry

Standardized Test Practice

1
In the Hall-Heroult cell shown, molten aluminum is produced from __________.

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A)carbon
B)iron
C)bauxite
D)cryolite
2
In the magnesium-copper voltaic cell shown, which metal(s) is (are) losing material?

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A)copper only
B)magnesium only
C)both copper and magnesium
D)neither copper nor magnesium
3
This reaction occurs at the cathode of an electrolytic cell.
A)oxidation
B)redox
C)reduction
D)decomposition
4
__________ forms at the cathode of a Downs cell.

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A)chlorine gas
B)hydrogen gas
C)liquid sodium
D)oxygen gas
5
A Hall-Heroult electrolytic cell is used to produce __________.
A)aluminum metal
B)chlorine gas
C)molten iron
D)sodium metal
6
The Hall-Heroult process is expensive because it consumes so much __________.
A)chlorine
B)electricity
C)oxygen
D)steel
7
This element is sometimes electroplated onto other metals to make them shiny and to improve their hardness, stability, and appearance.
A)chromium
B)magnesium
C)sodium
D)zinc
8
This reaction takes place at the cathode during the electrolysis of molten magnesium chloride.
A)Mg2+ + 2e- → Mg
B)2Cl- → Cl2+ + 2e-
C)Mg → Mg2+ + 2e-
D)Cl2 + 2e- → 2Cl-
9
Potential difference is expressed in __________.
A)amperes
B)current
C)ohms
D)volts
10
What is the oxidation half-reaction in a copper-zinc voltaic cell?
A)Zn → Zn2+ + 2e-
B)2Cl- → Cl2 + 2e-
C)Cu → Cu2+ + 2e-
D)O2 → 2O2- + 4e-
11
A voltaic cell that has been packaged as a portable power source may be called a/an __________.
A)ammeter
B)anode
C)battery
D)cathode
12
The carbon rod in the center of a carbon-zinc dry cell serves as the __________.

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A)anode
B)cathode
C)electrolyte
D)salt bridge
13
A lead storage battery contains several cells filled with a solution of __________.
A)silver nitrate
B)sodium hydroxide
C)sulfuric acid
D)zinc sulfate
14
The __________ storage battery can usually be discharged and recharged more than 500 times.
A)alkaline
B)anode
C)carbon-zinc
D)nicad
15
Which of the following must be true of a salt bridge?

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A)Ions can move through the salt bridge.
B)The salt bridge must prevent the flow of charged particles.
C)The solutions joined by the salt bridge can mix freely.
D)The tube of the salt bridge must remain open.
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