Chapter 15:
Solutions
Practice Test
1.
In a glass of sugar water, which substance is the solute?
a.
water
b.
sugar
c.
glass
d.
none of the above
Hint
2.
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.
99.626°C
b.
100.42°C
c.
101.64°C
d.
100.73°C
Hint
3.
The decrease in solubility of a gas in a solution when the pressure is reduced is described by _________.
a.
Charles’s law
b.
The ideal gas law
c.
Henry’s law
d.
Boyle’s law
Hint
4.
Molarity is defined as the ____________.
a.
mass of solute per mass of solution
b.
volume of solute per volume of solution
c.
moles of solute per kilograms of solvent
d.
moles of solute per liter of solution
Hint
5.
What is the name for a substance that dissolves in water but does not form ions or conduct an electric current?
a.
saturated
b.
nonelectrolyte
c.
electrolyte
d.
insoluble
Hint
6.
What is the mole fraction of ethanol (C
2
H
5
OH) in a solution of 47.5 g of ethanol in 850 g of water?
a.
0.98
b.
0.18
c.
0.032
d.
0.021
Hint
7.
A suspension is _________.
a.
a homogeneous mixture
b.
a solution
c.
impossible to prepare
d.
a heterogeneous mixture
Hint
8.
A colloid contains particles that _________.
a.
are between 1 nm and 1000 nm in diameter
b.
are smaller than atoms
c.
settle out if left undisturbed
d.
are atomic-size in scale
Hint
9.
Which of the following is not a colligative property?
a.
boiling point elevation
b.
increasing solubility
c.
freezing point depression
d.
vapor pressure lowering
Hint
10.
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.
62.0 g/mol
b.
39.7 g/mol
c.
58.4 g/mol
d.
46.2 g/mol
Hint
11.
A solution is said to be ________ when more solute can be dissolved in the solvent at a given temperature.
a.
solvated
b.
unsaturated
c.
supersaturated
d.
saturated
Hint
12.
A solution that contains less solute per volume of solvent than another solution made from the same components is said to be more ________.
a.
concentrated
b.
dissolved
c.
dilute
d.
solvated
Hint
13.
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.
-0.39°C
b.
-0.044°C
c.
-0.44°C
d.
-0.22°C
Hint
14.
What mass of Ca(OH)
2
is contained in 1500 mL of 0.0250
M
Ca(OH)
2
solution?
a.
3.17 g
b.
1.85 g
c.
2.34 g
d.
2.78 g
Hint
15.
The Tyndall effect describes ___________.
a.
the adsorption of positive ions onto the surface of a hydrophilic solid
b.
hydrophobic interactions between nonpolar molecules
c.
the scattering of light by colloidal particles
d.
precipitation of colloidal particles using electrically charged plates
Hint
16.
What is the molarity of 2500 mL of a solution that contains 160 grams of ammonium nitrate (NH
4
NO
3
)?
a.
0.333
M
b.
0.450
M
c.
0.800
M
d.
0.600
M
Hint
17.
In a solution, the substance that does the dissolving is ____________.
a.
the solvent
b.
the solute
c.
miscible
d.
saturated
Hint
18.
Which one of the following is an example of an emulsion?
a.
shaving cream
b.
fog
c.
styrofoam
d.
mayonnaise
Hint
19.
The process of a solvent and a solute completely mixing and forming a solution is ________.
a.
crystallization
b.
salvation
c.
solvation
d.
ionization
Hint
20.
Calculate the molality of 10% H
3
PO
4
solution in water.
a.
0.380
m
b.
1.51
m
c.
0.760
m
d.
1.13
m
Hint
