Chapter 15:
Solutions
Practice Test
1.
The Tyndall effect describes ___________.
a.
precipitation of colloidal particles using electrically charged plates
b.
the adsorption of positive ions onto the surface of a hydrophilic solid
c.
hydrophobic interactions between nonpolar molecules
d.
the scattering of light by colloidal particles
Hint
2.
What mass of Ca(OH)
2
is contained in 1500 mL of 0.0250
M
Ca(OH)
2
solution?
a.
2.78 g
b.
2.34 g
c.
3.17 g
d.
1.85 g
Hint
3.
In a solution, the substance that does the dissolving is ____________.
a.
miscible
b.
saturated
c.
the solvent
d.
the solute
Hint
4.
The process of a solvent and a solute completely mixing and forming a solution is ________.
a.
salvation
b.
crystallization
c.
solvation
d.
ionization
Hint
5.
Calculate the molality of a solution that contains 25 g of H
2
SO
4
dissolved in 80 g of water.
a.
3.2
m
b.
6.3
m
c.
2.2
m
d.
1.6
m
Hint
6.
Molarity is defined as the ____________.
a.
volume of solute per volume of solution
b.
mass of solute per mass of solution
c.
moles of solute per liter of solution
d.
moles of solute per kilograms of solvent
Hint
7.
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
8.
Which of the following will not increase the rate of solvation?
a.
formation of a precipitate
b.
agitating the mixture
c.
increasing the surface area
d.
increasing the temperature
Hint
9.
Which one of the following is an example of an emulsion?
a.
styrofoam
b.
mayonnaise
c.
fog
d.
shaving cream
Hint
10.
Solutions can be mixtures of _______________.
a.
liquids
b.
solids
c.
fog
d.
all of the above
Hint
11.
A solution is said to be ________ when more solute can be dissolved in the solvent at a given temperature.
a.
saturated
b.
supersaturated
c.
solvated
d.
unsaturated
Hint
12.
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.
0.18
c.
0.021
d.
0.98
Hint
13.
What is the name for a substance that dissolves in water but does not form ions or conduct an electric current?
a.
insoluble
b.
electrolyte
c.
saturated
d.
nonelectrolyte
Hint
14.
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.
-0.39°C
c.
-0.22°C
d.
-0.44°C
Hint
15.
A solution that contains less solute per volume of solvent than another solution made from the same components is said to be more ________.
a.
dilute
b.
concentrated
c.
solvated
d.
dissolved
Hint
16.
In a glass of sugar water, which substance is the solute?
a.
glass
b.
sugar
c.
water
d.
none of the above
Hint
17.
What is a common means of identifying a supersaturated solution?
a.
solvation
b.
hydration
c.
precipitation
d.
dissolution
Hint
18.
A colloid contains particles that _________.
a.
are atomic-size in scale
b.
settle out if left undisturbed
c.
are smaller than atoms
d.
are between 1 nm and 1000 nm in diameter
Hint
19.
Which of the following is not a colligative property?
a.
freezing point depression
b.
vapor pressure lowering
c.
boiling point elevation
d.
increasing solubility
Hint
20.
What volume of 12.6
M
HCl must be added to sufficient water to prepare 5.00 liters of 3.00M HCl?
a.
7.56 L
b.
1.19 L
c.
0.840 L
d.
21.0 L
Hint
