Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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Which of the following has components in a nonuniform arrangement?
a. | homogeneous mixture | c. | salt water | b. | solution | d. | heterogeneous
mixture |
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2.
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A heterogeneous mixture always contains
a. | only one substance. | b. | more than two substances. | c. | two or more
substances that are visibly distinguishable. | d. | two or more substances that are not visibly
distinguishable. |
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3.
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Which of the following is a heterogeneous mixture?
a. | water | c. | whole wheat bread | b. | a sugar-water solution | d. | sugar |
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4.
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Which of the following is a homogeneous mixture?
a. | water | c. | whole wheat bread | b. | a sugar-water solution | d. | sugar |
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5.
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All of the following are homogeneous mixtures except
a. | soil. | c. | gasoline. | b. | a sugar-water solution. | d. | a salt-water
solution. |
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6.
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Water in air is an example of which solute-solvent combination?
a. | gas-liquid | c. | liquid-liquid | b. | liquid-gas | d. | gas-gas |
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7.
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Oxygen in nitrogen is an example of which solute-solvent combination?
a. | gas-liquid | c. | gas-solid | b. | liquid-gas | d. | gas-gas |
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8.
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Which is not an example of a colloid?
a. | paint | c. | butter | b. | smoke | d. | sugar water |
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9.
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A substance whose water solution is a good conductor of electricity is
a(n)
a. | nonelectrolyte. | c. | nonpolar substance. | b. | electrolyte. | d. | solute. |
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10.
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Which of the following is a molecular substance whose aqueous solution carries
an electric current?
a. | liquid hydrogen | c. | sugar | b. | hydrogen chloride | d. | iron |
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11.
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Which of the following is a nonelectrolyte?
a. | sodium chloride | c. | sugar | b. | hydrogen chloride | d. | potassium
chloride |
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12.
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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. |
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13.
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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. |
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14.
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A solute crystal is dropped into a solution containing dissolved solute. It
falls to the bottom of the beaker and does not dissolve after vigorous stirring. What does this
indicate about the solution?
a. | It is probably unsaturated. | c. | It is probably
saturated. | b. | It is probably supersaturated. | d. | It is not at
equilibrium. |
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15.
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The solubility of ethanol, CH3CH2OH, molecules in water is
enhanced by
a. | the pressure of the solvent. | b. | the size of the solute
molecules. | c. | attraction between the ions in solution. | d. | hydrogen bonding
between the solute and solvent molecules. |
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16.
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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. |
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17.
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During the dissolving process, which particles interact?
a. | solute only | c. | solute and solvent | b. | solvent only | d. | None of the
above |
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18.
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The formation of solid-liquid solutions
a. | always releases energy as heat. | b. | always absorbs energy as
heat. | c. | can either absorb or release energy as heat. | d. | neither absorbs nor
releases energy as heat. |
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19.
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Pressure has the greatest effect on the solubility of
a. | solids in liquids. | c. | gases in gases. | b. | liquids in liquids. | d. | gases in
liquids. |
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20.
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Henry's law relates
a. | pressure to temperature. | c. | temperature to gas-liquid
solubility. | b. | pressure to gas-liquid solubility. | d. | pressure to liquid-solid
solubility. |
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21.
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As temperature increases, solubility of solids in liquids
a. | always increases. | c. | usually increases. | b. | always decreases. | d. | usually
decreases. |
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22.
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Which of the following is expressed in grams of solute instead of moles of
solute?
a. | molality | c. | Neither (a) nor (b) | b. | molarity | d. | Both (a) and
(b) |
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23.
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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 |
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24.
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An NaOH solution contains 1.90 mol of NaOH, and its concentration is 0.555 M.
What is its volume? (molar mass of NaOH = 40.00 g/mol)
a. | 0.623 L | c. | 1.05 L | b. | 0.911 L | d. | 3.42 L |
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25.
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How many milliliters of a 0.171 M solution contain 1.00 g of NaCl? (molar mass
of NaCl = 58.44 g/mol)
a. | 100. mL | c. | 171 mL | b. | 1000. mL | d. | 17.1 mL |
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