Oxidation-Reduction Reactions
Practice Test
1.
Driven by concentration difference, the movement of molecules through a semipermeable memebrane is called ___________.
a.
capillarity
b.
osmosis
c.
reverse movement
d.
boiling
2.
Determine the net change in oxidation number of chlorine in the following reaction: ClO4- (aq) + Br- (aq) ® Cl- (aq) + Br2(g) (in acid solution)
a.
8
b.
-8
c.
-7
d.
7
3.
H
+
(aq) + OH
-
(aq)
H
2
O(l) is the _____________ equation for a strong acid-strong base neutralization reaction.
a.
complete ionic
b.
reverse
c.
net ionic
d.
formula
4.
What will a nonmetallic anhydride produce in aqueous solution?
a.
acid
b.
salt
c.
base
d.
solid precipitate
5.
What is the empirical formula of a compound that is 66.0% calcium and 34.0% phosphorus?
a.
Ca
3
P
5
b.
Ca
3
P
2
c.
Ca
4
P
d.
CaP
3
6.
Which of these combinations will NOT make an acid-base buffer?
a.
HC
2
H
3
O
2
/NaC
2
H
3
O
2
b.
NaOH/NaCl
c.
NH
3
/NH
4
NO
3
d.
HCN/KCN
7.
How many moles of chlorine are in 100 g chlorine (Cl)?
a.
0.355
b.
64.6
c.
2.82
d.
100
8.
___________________ allow you to determine the approximate pH of a solution.
a.
Acid-base indicators
b.
Anhydrides
c.
Beakers
d.
Equations
9.
The polarity of the water molecule accounts for water's ________________.
a.
unusually high boiling point
b.
formula
c.
unusually low melting point
d.
unusually high mass
10.
What is the theoretical yield of nitrogen gas if 200 g of sodium azide decomposes?
a.
127 g
b.
400 g
c.
200 g
d.
135 g
11.
What chemical species is the reducing agent in the reaction described in question 23?
a.
Br
2
b.
H
2
O
2
c.
Br
-
d.
O
-
12.
Water's ___________________ helps keep you cool on a hot day.
a.
high heat of vaporization
b.
low freezing point
c.
large volume
d.
high density
13.
What is the base in the reaction HI + H
2
O
H
3
O + I
-
?
a.
H
3
O
+
b.
H
2
O
c.
HI
d.
Isub>2
14.
What is the molarity of a solution prepared by dissolving 50.0 g of NaCl to make 500.0 mL of solution?
a.
0.100 M
b.
1.17 M
c.
1.71 M
d.
0.855 M
15.
Large deposits of solid, elemental __________ are formed in redox reactions near the vents of some volcanoes.
a.
sulfur
b.
chlorine
c.
oxygen
d.
hydrogen
16.
How many moles of sucrose, C
12
H
22
O
11
, are in 1222 g of sucrose?
a.
3.57
b.
0.258
c.
1.22
d.
10.8
17.
Which of these compounds is NOT used in antacids?
a.
KOH
b.
Mg(OH)
2
c.
NaHCO
3
d.
CaCO
3
18.
What is the oxidation number of chlorine in KClO
3
?
a.
5+
b.
1+
c.
1-
d.
3+
19.
A pH 13 solution is ______________ times more basic than a pH 9 solution.
a.
10 000
b.
1000
c.
100
d.
10
20.
An aqueous solution of a weak acid contains ___________________ unionized acid molecules.
a.
a high concentration of
b.
a low concentration of
c.
no
d.
100%
