Section 15.3
Colligative Properties of Solutions
Practice Test
1.
What is the name for a substance that dissolves in water but does not form ions or conduct an electric current?
a.
nonelectrolyte
b.
electrolyte
c.
insoluble
d.
saturated
Hint
2.
Which of the following is not a colligative property?
a.
freezing point depression
b.
boiling point elevation
c.
vapor pressure lowering
d.
increasing solubility
Hint
3.
If 4.27 g sucrose (C
12
H
22
O
11
) are dissolved in 15.2 g water, what is the boiling point of the resulting solution? K
b
for water = 0.512°C/
m
.
a.
101.64°C
b.
100.42°C
c.
99.626°C
d.
100.73°C
Hint
4.
Calculate the freezing point of a solution that contains 8.0 g of sucrose (C
12
H
22
O
11
) in 100 g of H
2
O. K
f
for H
2
O = 1.86°C/
m
a.
-0.044°C
b.
-0.22°C
c.
-0.39°C
d.
-0.44°C
Hint
5.
A 4.305-g sample of a nonelectrolyte is dissolved in 105 g of water. The solution freezes at -1.23°C. Calculate the molar mass of the solute. K
f
for water = 1.86°C/
m
.
a.
39.7 g/mol
b.
58.4 g/mol
c.
46.2 g/mol
d.
62.0 g/mol
Hint
