Electrochemistry
Practice Test
1.
Acid-base reactions are usually __________________ reactions.
a.
combustion
b.
decomposition
c.
double-displacement
d.
synthesis
2.
A solution that contains very little solute is described as ____________.
a.
concentrated
b.
saturated
c.
massive
d.
dilute
3.
A pH 2 solution is ___________ times more acidic than a pH 4 solution.
a.
one hundred
b.
ten
c.
one million
d.
two
4.
Which of the following compounds is NOT a base?
a.
NaOH
b.
NH
3
c.
KCN
d.
KOH
5.
Large deposits of solid, elemental __________ are formed in redox reactions near the vents of some volcanoes.
a.
chlorine
b.
hydrogen
c.
oxygen
d.
sulfur
6.
The complete neutralization of a weak acid with a strong base produces a _______________ solution.
a.
acidic
b.
neutral
c.
cold
d.
basic
7.
Ice is ___________ liquid water.
a.
less dense
b.
more fluid
c.
equally as dense as
d.
more massive
8.
What is the molarity of a solution prepared by dissolving 50.0 g of NaCl to make 500.0 mL of solution?
a.
1.17 M
b.
1.71 M
c.
0.855 M
d.
0.100 M
9.
What is the oxidation number of iron in Fe
2
O
3
?
a.
3+
b.
2-
c.
2+
d.
1+
10.
What is the oxidation number of chlorine in KClO
3
?
a.
3+
b.
1-
c.
5+
d.
1+
11.
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 salt bridge must prevent the flow of charged particles.
d.
The solutions joined by the salt bridge can mix freely.
12.
Which type of can takes the longest to degrade?
a.
tin
b.
iron
c.
aluminum
d.
steel
13.
This is a product of the major reaction occuring in a carbon-zinc dry cell.
a.
H
2
O
2
b.
Zn
c.
MnO
2
d.
Zn
2+
14.
_____________ forms at the cathode of a Downs cell.
a.
Hydrogen gas
b.
Liquid sodium
c.
Chlorine gas
d.
Oxygen gas
15.
The pH scale is used to express the concentrations of hydronium ions and _____________ ions in aqueous solutions.
a.
carbon
b.
potassium
c.
hydroxide
d.
fluoride
16.
What will be the acid-base condition of the solution when ammonium citrate is dissolved in water?
a.
acidic
b.
basic
c.
The acid-base condition cannot be determined.
d.
neutral
17.
The water molecule is polar partly because of its _____________.
a.
mass
b.
volume
c.
geometry
d.
weight
18.
To prevent corrosion, metal garbage cans and other iron objects are dipped into _____________.
a.
molten zinc
b.
hydrochloric acid
c.
liquid oxygen
d.
hydrogen peroxide
19.
A __________ is a substance that resists changes in pH when moderate amounts of acids or bases are added.
a.
buffer
b.
hydroxide
c.
hydronium
d.
spectator ion
20.
Nonmetal oxides are _________________.
a.
acidic anhydrides
b.
hydrides
c.
nonpolar solutes
d.
basic anhydrides
