Electrochemistry
Practice Test
1.
If you wanted to electroplate a metal object with silver, you would use silver as the ________________.
a.
cathode
b.
metal to be plated
c.
battery
d.
anode
2.
The cation in an aqueous rubidium chromate solution is ___________.
a.
CrO
4
-
b.
Rb
2+
c.
Rb
+
d.
Cr
3+
3.
To prevent corrosion, metal garbage cans and other iron objects are dipped into _____________.
a.
hydrochloric acid
b.
liquid oxygen
c.
hydrogen peroxide
d.
molten zinc
4.
This reaction occurs at the anode of an electrolytic cell.
a.
oxidation
b.
synthesis
c.
redox
d.
reduction
5.
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.
reduction of cadmium in the presence of a base
c.
oxidation or cadmium in the presence of a base
d.
reduction of cadmium in the presence of an acid
6.
The _________ storage battery can usually be discharged and recharged more than 500 times.
a.
alkaline
b.
carbon-zinc
c.
nicad
d.
anode
7.
What is the cathode in the electrolytic cell used for silver plating?
a.
the silver metal source
b.
the electrolyte solution
c.
the power source
d.
the object to be plated
8.
This reaction takes place at the cathode during the electrolysis of molten magnesium chloride.
a.
2Cl
-
Cl
2
+ 2e
-
b.
Mg
2+
+ 2e
-
Mg
c.
Cl
2
+ 2e
-
2Cl
-
d.
Mg
Mg
2+
+ 2e
-
9.
The Hall-Heroult process is expensive because it consumes so much ______________.
a.
electricity
b.
chlorine
c.
steel
d.
oxygen
10.
The anion in an aqueous ammonium nitrate solution is ___________.
a.
N
3
-
b.
NO
3
-
c.
NH
4
+
d.
O
2-
11.
What reaction occurs when a strip of tin is immersed in an aqueous calcium nitrate solution?
a.
Sn
Sn
2+
+ 2e
-
b.
Ca
Ca
2+
+ 2e
-
c.
Sn
Sn
4+
+ 4e
-
d.
None
12.
A process in which electricity causes a nonspontaneous chemical reaction is called _________________.
a.
photogenesis
b.
hydrolysis
c.
electrolysis
d.
synthesis
13.
Why are alkaline dry cell batteries smaller in size than zinc-carbon dry cells?
a.
Zinc paste takes up less space than zinc powder.
b.
No zinc is reduced in the alkaline batteries.
c.
Alkaline batteries do not need the carbon rod cathode.
d.
Alkaline batteries do not require steel cases.
14.
A Hall-Heroult electrolytic cell is used to produce _________________.
a.
aluminum metal
b.
molten iron
c.
sodium metal
d.
chlorine gas
15.
The carbon rod in the center of a carbon-zinc dry cell serves as the ____________.
a.
cathode
b.
electrolyte
c.
anode
d.
salt bridge
16.
Potential difference is expressed in _________.
a.
ohms
b.
current
c.
volts
d.
amperes
17.
Alessandro Volta proved that electricity can be generated by ______________.
a.
gold foil
b.
dissimilar metals
c.
frogs' legs
d.
two samples of the same metal in a solution
18.
What is the oxidation half-reaction in a copper-zinc galvanic cell?
a.
2Cl
-
Cl
2
+ 2e
-
b.
O
2
2O
2-
+ 4e
-
c.
Cu
Cu
2+
+ 2e
-
d.
Zn
Zn
2+
+ 2e
-
19.
This reaction occurs at the cathode of an electrolytic cell.
a.
oxidation
b.
decomposition
c.
reduction
d.
redox
20.
Chemical energy is converted into electrical energy in a _______________.
a.
motor
b.
electrical cell
c.
electrolytic cell
d.
galvanic cell
21.
_____________ forms at the cathode of a Downs cell.
a.
Liquid sodium
b.
Hydrogen gas
c.
Oxygen gas
d.
Chlorine gas
22.
Some of these electricity-producing devices have platinum electrodes, use hydrogen and oxygen, and produce water.
a.
fuel cells
b.
electrolytic cells
c.
lithium batteries
d.
alkaline batteries
23.
Which of the following must be true of a salt bridge?
a.
The tube of the salt bridge must remain open.
b.
Ions can move through the salt bridge.
c.
The solutions joined by the salt bridge can mix freely.
d.
The salt bridge must prevent the flow of charged particles.
24.
A/an ____________ can be used to restore charge balance in a galvanic cell.
a.
salt bridge
b.
anode
c.
voltmeter
d.
cathode
25.
A galvanic cell that has been packaged as a portable power source may be called a/an _________.
a.
anode
b.
battery
c.
ammeter
d.
cathode
26.
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
27.
This element is used in pacemaker batteries.
a.
lithium
b.
potassium
c.
arsenic
d.
boron
28.
A lead storage battery contains several cells filled with a solution of ________________.
a.
silver nitrate
b.
sodium hydroxide
c.
zinc sulfate
d.
sulfuric acid
