Multiple Choice
Identify the
choice that best completes the statement or answers the question.
|
|
|
1.
|
Which of the following is a heterogeneous mixture?
a. | water | c. | whole wheat bread | b. | a sugar-water solution | d. | sugar |
|
|
|
2.
|
Which of the following is a homogeneous mixture?
a. | water | c. | whole wheat bread | b. | a sugar-water solution | d. | sugar |
|
|
|
3.
|
All of the following are homogeneous mixtures except
a. | soil. | c. | gasoline. | b. | a sugar-water solution. | d. | a salt-water
solution. |
|
|
|
4.
|
Sugar dissolved in water is an example of which solute-solvent
combination?
a. | gas-liquid | c. | solid-liquid | b. | liquid-liquid | d. | liquid-solid |
|
|
|
5.
|
Which mixture is made up of the smallest particles?
a. | milk | c. | shaving cream | b. | salt water | d. | muddy water |
|
|
|
6.
|
Which mixture contains particles that are in a dispersed phase and do not settle
out?
a. | a colloid | c. | a solution | b. | a homogeneous mixture | d. | a suspension |
|
|
|
7.
|
A foam is a colloidal dispersion of
a. | two liquids. | c. | a solid and a liquid. | b. | two
solids. | d. | a gas and a
liquid. |
|
|
|
8.
|
The colloidal particles in a colloid form the
a. | dispersing medium. | c. | solvent. | b. | dispersed phase. | d. | solute. |
|
|
|
9.
|
The Tyndall effect is used to distinguish between
a. | liquids and gases. | c. | electrolytes and nonelectrolytes. | b. | solutions and
colloids. | d. | solvents and
solutes. |
|
|
|
10.
|
Which of the following is an electrolyte?
a. | sodium chloride | c. | pure water | b. | sugar | d. | glass |
|
|
|
11.
|
Substances whose water solutions conduct electricity easily
a. | require carbon to decompose in water. | b. | ionize in water. | c. | do not dissolve in
water. | d. | contain neutral solute molecules. |
|
|
|
12.
|
Which of the following decreases the average kinetic energy of solvent
molecules?
a. | decreasing the pressure | b. | not stirring the solution | c. | decreasing the
contact area between solvent and solute | d. | decreasing the
temperature |
|
|
|
13.
|
Raising the collision rate between solute and solvent
a. | increases the rate of dissolution. | b. | decreases the rate of
dissolution. | c. | has no effect on the rate of dissolution. | d. | can increase,
decrease, or have no effect on the rate of dissolution. |
|
|
|
14.
|
Raising solvent temperature causes solvent-solute collisions to become
a. | less frequent and more energetic. | c. | less frequent and less
energetic. | b. | more frequent and more energetic. | d. | more frequent and less
energetic. |
|
|
|
15.
|
The solubility of a substance at a given temperature is generally expressed
as
a. | amount of solute. | b. | amount of solvent. | c. | amount of solute per
amount of solvent. | d. | amount of water per 100 g of
solute. |
|
|
|
16.
|
The rate of dissolution is
a. | directly related to solubility. | c. | related to the square of the
solubility. | b. | inversely related to solubility. | d. | not related to
solubility. |
|
|
|
17.
|
Two immiscible substances
a. | exist together in one phase. | b. | will not separate on
standing. | c. | dissolve freely in one another in any proportion. | d. | will not form a
solution. |
|
|
|
18.
|
Which of the following releases energy?
a. | overcoming solute-solute attraction | c. | overcoming solvent-solvent
attraction | b. | forming solute-solvent attraction | d. | All of the
above |
|
|
|
19.
|
When the energy released by forming solvent-solute attractions is greater than
the energy absorbed by overcoming solute-solute and solvent-solvent attractions, the dissolving
process
a. | has a negative enthalpy of solution. | c. | is endothermic. | b. | has a positive
enthalpy of solution. | d. | does
not occur. |
|
|
|
20.
|
Enthalpy of solution is generally expressed in
a. | kilocalories. | b. | moles of solute per
kilogram. | c. | kilojoules per mole of solute at a specified temperature. | d. | moles of solute in a
specified amount of solvent per kilojoule. |
|
|
|
21.
|
The solubility of gases in liquids
a. | increases with increasing pressure. | c. | decreases with increasing
pressure. | b. | cannot reach equilibrium. | d. | does not depend on pressure. |
|
|
|
22.
|
For a mixture of gases, the solubility of each gas in water varies
a. | directly with the partial pressure of the gas. | b. | inversely with the
partial pressure of the gas. | c. | directly with the total pressure of the
mixture. | d. | inversely with the total pressure of the mixture. |
|
|
|
23.
|
Which of the following expresses concentration?
a. | molality | c. | moles of solute per liter of solution | b. | molarity | d. | All of the above |
|
|
|
24.
|
What is the molarity of a solution that contains 0.202 mol KCl in 7.98 L
solution?
a. | 0.0132 M | c. | 0.459 M | b. | 0.0253 M | d. | 1.363 M |
|
|
|
25.
|
What is the molality of a solution that contains 31.0 g HCl in 5.00 kg water?
(molar mass of HCl = 36.46 g/mol)
a. | 0.062 m | c. | 0.170 m | b. | 0.425 m | d. | 15.5 m |
|