Section 17.2
Galvanic Cells: Electricity from Chemistry
Practice Test
1.
Alessandro Volta proved that electricity can be generated by ______________.
a.
dissimilar metals
b.
frogs' legs
c.
gold foil
d.
two samples of the same metal in a solution
Hint
2.
Chemical energy is converted into electrical energy in a _______________.
a.
electrical cell
b.
electrolytic cell
c.
galvanic cell
d.
motor
Hint
3.
Potential difference is expressed in _________.
a.
amperes
b.
current
c.
ohms
d.
volts
Hint
4.
What is the oxidation half-reaction in a copper-zinc galvanic cell?
a.
Zn
Zn
2+
+ 2e
-
b.
2Cl
-
Cl
2
+ 2e
-
c.
Cu
Cu
2+
+ 2e
-
d.
O
2
2O
2-
+ 4e
-
Hint
5.
A/an ____________ can be used to restore charge balance in a galvanic cell.
a.
anode
b.
cathode
c.
salt bridge
d.
voltmeter
Hint
6.
What reaction occurs when a strip of tin is immersed in an aqueous calcium nitrate solution?
a.
None
b.
Sn
Sn
2+
+ 2e
-
c.
Ca
Ca
2+
+ 2e
-
d.
Sn
Sn
4+
+ 4e
-
Hint
7.
A galvanic cell that has been packaged as a portable power source may be called a/an _________.
a.
ammeter
b.
anode
c.
battery
d.
cathode
Hint
8.
The carbon rod in the center of a carbon-zinc dry cell serves as the ____________.
a.
anode
b.
cathode
c.
electrolyte
d.
salt bridge
Hint
9.
This is a product of the major reaction occuring in a carbon-zinc dry cell.
a.
Zn
2+
b.
H
2
O
2
c.
MnO
2
d.
Zn
Hint
10.
This element is used in pacemaker batteries.
a.
arsenic
b.
boron
c.
lithium
d.
potassium
Hint
11.
A lead storage battery contains several cells filled with a solution of ________________.
a.
silver nitrate
b.
sodium hydroxide
c.
sulfuric acid
d.
zinc sulfate
Hint
12.
The _________ storage battery can usually be discharged and recharged more than 500 times.
a.
alkaline
b.
anode
c.
carbon-zinc
d.
nicad
Hint
13.
Some of these electricity-producing devices have platinum electrodes, use hydrogen and oxygen, and produce water.
a.
alkaline batteries
b.
electrolytic cells
c.
fuel cells
d.
lithium batteries
Hint
14.
Which of the following must be true of a salt bridge?
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.
Hint
15.
Why are alkaline dry cell batteries smaller in size than zinc-carbon dry cells?
a.
Alkaline batteries do not need the carbon rod cathode.
b.
Alkaline batteries do not require steel cases.
c.
No zinc is reduced in the alkaline batteries.
d.
Zinc paste takes up less space than zinc powder.
Hint
16.
What is the anode reaction when a NiCad battery is used to generate electric current?
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
Hint
