Solutions
Practice Test
1.
The decrease in solubility of a gas in a solution when the pressure is reduced is described by _________.
a.
Boyle’s law
b.
the ideal gas law
c.
Henry’s law
d.
Charles’s law
2.
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
SC.A.1.4.3
a.
-0.39°C
b.
-0.44°C
c.
-0.044°C
d.
-0.22°C
3.
The Tyndall effect describes ______________.
SC.A.2.4.6
a.
the scattering of light by colloidal particles
b.
precipitation of colloidal particles using electrically charged plates
c.
hydrophobic interactions between nonpolar molecules
d.
the adsorption of positive ions onto the surface of a hydrophilic solid
4.
What is the molarity of 2500 mL of a solution that contains 160 grams of ammonium nitrate
NH
4
NO
3
?
a.
0.450
M
b.
0.333
M
c.
0.600
M
d.
0.800
M
5.
In a solution, the substance that does the dissolving is ____________.
a.
the solute
b.
miscible
c.
saturated
d.
the solvent
6.
A colloid contains particles that ____________________.
SC.A.2.4.6
a.
are atomic-size in scale
b.
are between 1 nm and 1000 nm in diameter
c.
settle out if left undisturbed
d.
are smaller than atoms
7.
If 12.0 g of a gas at 2.5 atm dissolve in 1.0 L of water at 25°C, how much will dissolve in 1.0 L of water at STP?
SC.A.1.4.3
a.
12.0 g/L
b.
4.8 g/L
c.
0.21 g/L
d.
2.1 g/L
8.
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
.
SC.A.1.4.3
a.
39.7 g/mol
b.
58.4 g/mol
c.
62.0 g/mol
d.
46.2 g/mol
9.
What is the name for a substance that dissolves in water but does not form ions or conduct an electric current?
a.
saturated
b.
insoluble
c.
nonelectrolyte
d.
electrolyte
10.
What mass of Ca
OH
2
is contained in 1500 mL of 0.0250
M
Ca
OH
2
solution?
SC.B.1.4.2
a.
1.85 g
b.
2.78 g
c.
3.17 g
d.
2.34 g
11.
In a glass of sugar water, which substance is the solute?
a.
water
b.
glass
c.
sugar
d.
none of the above
12.
What is the percent by mass of NaCl in a solution that contains 17.5 g NaCl per 500.0 g of water?
SC.B.1.4.2
a.
3.38%
b.
3.61%
c.
3.50%
d.
14.80%
13.
Molarity is defined as the ____________.
a.
moles of solute per liter of solution
b.
moles of solute per kilograms of solvent
c.
mass of solute per mass of solution
d.
volume of solute per volume of solution
14.
Solutions can be mixtures of _______________.
a.
all of the above
b.
liquids
c.
gases
d.
solids
15.
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
.
SC.A.1.4.3
a.
99.626°C
b.
100.73°C
c.
101.64°C
d.
100.42°C
16.
Which of the following is not a colligative property?
a.
increasing solubility
b.
boiling point elevation
c.
freezing point depression
d.
vapor pressure lowering
17.
Which one of the following is an example of an emulsion?
a.
styrofoam
b.
shaving cream
c.
fog
d.
mayonnaise
18.
A suspension is _________.
SC.A.2.4.6
a.
a heterogeneous mixture
b.
a solution
c.
impossible to prepare
d.
a homogeneous mixture
19.
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.
0.032
b.
0.98
c.
0.021
d.
0.18
