Chapter 17:
Electrochemistry
Practice Test
1.
A/an ____________ can be used to restore charge balance in a galvanic cell.
a.
anode
b.
salt bridge
c.
voltmeter
d.
cathode
Hint
2.
This reaction takes place at the cathode during the electrolysis of molten magnesium chloride.
a.
Cl
2
+ 2e
-
2Cl
-
b.
Mg
2+
+ 2e
-
Mg
c.
2Cl
-
Cl
2
+ 2e
-
d.
Mg
Mg
2+
+ 2e
-
Hint
3.
The cation in an aqueous rubidium chromate solution is ___________.
a.
Rb
2+
b.
Rb
+
c.
Cr
3+
d.
CrO
4
-
Hint
4.
Some of these electricity-producing devices have platinum electrodes, use hydrogen and oxygen, and produce water.
a.
fuel cells
b.
lithium batteries
c.
alkaline batteries
d.
electrolytic cells
Hint
5.
What reaction occurs when a strip of tin is immersed in an aqueous calcium nitrate solution?
a.
Ca
Ca
2+
+ 2e
-
b.
Sn
Sn
2+
+ 2e
-
c.
Sn
Sn
4+
+ 4e
-
d.
None
Hint
6.
If you wanted to electroplate a metal object with silver, you would use silver as the ________________.
a.
battery
b.
cathode
c.
metal to be plated
d.
anode
Hint
7.
What is the oxidation half-reaction in a copper-zinc galvanic cell?
a.
Cu
Cu
2+
+ 2e
-
b.
O
2
2O
2-
+ 4e
-
c.
Zn
Zn
2+
+ 2e
-
d.
2Cl
-
Cl
2
+ 2e
-
Hint
8.
A galvanic cell that has been packaged as a portable power source may be called a/an _________.
a.
battery
b.
ammeter
c.
anode
d.
cathode
Hint
9.
To prevent corrosion, metal garbage cans and other iron objects are dipped into _____________.
a.
liquid oxygen
b.
hydrochloric acid
c.
hydrogen peroxide
d.
molten zinc
Hint
10.
This is a product of the major reaction occuring in a carbon-zinc dry cell.
a.
Zn
b.
Zn
2+
c.
H
2
O
2
d.
MnO
2
Hint
11.
Potential difference is expressed in _________.
a.
ohms
b.
current
c.
volts
d.
amperes
Hint
12.
This element is sometimes electroplated onto other metals to make them shiny and to improve their hardness, stability, and appearance.
a.
sodium
b.
zinc
c.
chromium
d.
magnesium
Hint
13.
The anion in an aqueous ammonium nitrate solution is ___________.
a.
O
2-
b.
N
3
-
c.
NH
4
+
d.
NO
3
-
Hint
14.
_____________ forms at the cathode of a Downs cell.
a.
Oxygen gas
b.
Liquid sodium
c.
Chlorine gas
d.
Hydrogen gas
Hint
15.
This reaction occurs at the cathode of an electrolytic cell.
a.
reduction
b.
decomposition
c.
redox
d.
oxidation
Hint
16.
Alessandro Volta proved that electricity can be generated by __________.
a. dissimilar metals
b. solution
c. gold foil
d. frogs' legs
Hint
17.
Chemical energy is converted into electrical energy in a _______________.
a.
motor
b.
electrolytic cell
c.
electrical cell
d.
galvanic cell
Hint
18.
The _________ storage battery can usually be discharged and recharged more than 500 times.
a.
nicad
b.
anode
c.
alkaline
d.
carbon-zinc
Hint
19.
A lead storage battery contains several cells filled with a solution of ________________.
a.
sulfuric acid
b.
sodium hydroxide
c.
silver nitrate
d.
zinc sulfate
Hint
20.
A Hall-Heroult electrolytic cell is used to produce _________________.
a.
sodium metal
b.
chlorine gas
c.
aluminum metal
d.
molten iron
Hint
