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.
electrolyte
b.
insoluble
c.
nonelectrolyte
d.
saturated
2.
The Tyndall effect describes ______________.
a.
the scattering of light by colloidal particles
b.
the adsorption of positive ions onto the surface of a hydrophilic solid
c.
hydrophobic interactions between nonpolar molecules
d.
precipitation of colloidal particles using electrically charged plates
3.
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?
a.
12.0 g/L
b.
4.8 g/L
c.
2.1 g/L
d.
0.21 g/L
4.
In a glass of sugar water, which substance is the solute?
a.
sugar
b.
glass
c.
water
d.
none of the above
5.
Which one of the following is an example of an emulsion?
a.
styrofoam
b.
shaving cream
c.
fog
d.
mayonnaise
6.
A colloid contains particles that ____________________.
a.
are between 1 nm and 1000 nm in diameter
b.
are smaller than atoms
c.
are atomic-size in scale
d.
settle out if left undisturbed
7.
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.
-0.44°C
b.
-0.39°C
c.
-0.22°C
d.
-0.044°C
8.
What volume of 12.6
M
HCl must be added to sufficient water to prepare 5.00 liters of 3.00
M
HCl?
a.
7.56 L
b.
21.0 L
c.
0.840 L
d.
1.19 L
9.
Which of the following is not a colligative property?
a.
increasing solubility
b.
boiling point elevation
c.
vapor pressure lowering
d.
freezing point depression
10.
A solution is said to be ________ when more solute can be dissolved in the solvent at a given temperature.
a.
solvated
b.
supersaturated
c.
unsaturated
d.
saturated
11.
Calculate the molarity of 0.75 L of a solution containing 0.83 g of dissolved KCl.
a.
0.75 M
b.
1.1 M
c.
6.2
d.
0.015 M
12.
Which of the following will not increase the rate of solvation?
a.
increasing the temperature
b.
agitating the mixture
c.
formation of a precipitate
d.
increasing the surface area
13.
The decrease in solubility of a gas in a solution when the pressure is reduced is described by _________.
a.
Boyle’s law
b.
Henry’s law
c.
the ideal gas law
d.
Charles’s law
14.
How much solvent is needed to make 200 ml of 50% rubbing alcohol?
a.
50 mL
b.
100 mL
c.
200 mL
d.
150 mL
15.
Calculate the molality of 10% H
3
PO
4
solution in water.
a.
0.760
m
b.
1.51
m
c.
1.13
m
d.
0.380
m
16.
A suspension is _________.
a.
a homogeneous mixture
b.
impossible to prepare
c.
a heterogeneous mixture
d.
a solution
17.
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.
100.42°C
b.
100.73°C
c.
101.64°C
d.
99.626°C
18.
How many grams of NaCl are dissolved in 500.0 mL of a 0.05M solution of NaCl?
a.
0.05 g
b.
2.92 g
c.
0.29 g
d.
1.46 g
19.
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.
46.2 g/mol
b.
62.0 g/mol
c.
58.4 g/mol
d.
39.7 g/mol
