Ch. 14/15 Prep-Test
Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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The intermolecular forces between particles in a liquid can involve all of the
following except
a. | London dispersion forces. | c. | dipole-dipole
attractions. | b. | hydrogen bonding. | d. | gravitational forces. |
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2.
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The attractive forces in a liquid are
a. | strong enough to prevent the particles from changing positions. | b. | too weak to hold the
particles in fixed positions. | c. | more effective than those in a
solid. | d. | too weak to limit the movements of the particles. |
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3.
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What causes particles in a liquid to escape into a gas state?
a. | high kinetic energy | c. | surface tension | b. | a freezing temperature | d. | the combining of
liquids |
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4.
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In general, most substances are
a. | least dense in the liquid state. | c. | less dense as solids than as
liquids. | b. | more dense as gases than as solids. | d. | most dense in the solid
state. |
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5.
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What causes the high density of solids?
a. | The particles are more massive than those in liquids. | b. | The intermolecular
forces between particles are weak. | c. | The particles are packed closely
together. | d. | The energy of the particles is very high. |
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6.
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A volatile liquid
a. | has strong attractive forces between particles. | b. | evaporates
readily. | c. | has an odor. | d. | is ionic. |
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7.
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At pressures greater than 760 mm Hg, water will boil at
a. | a temperature higher than 100ºC. | c. | 100ºC. | b. | a temperature lower
than 100ºC. | d. | 4ºC. |
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8.
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Why would a camper near the top of Mt. Everest find that water boils at less
than 100ºC?
a. | There is greater atmospheric pressure than at sea level. | b. | The flames are
hotter at that elevation. | c. | There is less atmospheric pressure than at sea
level. | d. | The atmosphere has less moisture. |
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9.
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Carbon dioxide in water is an example of which solute-solvent
combination?
a. | gas-liquid | c. | liquid-liquid | b. | liquid-gas | d. | cannot be
determined |
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10.
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A metal solution is a(n)
a. | colloid. | c. | suspension. | b. | alloy. | d. | electrolyte. |
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11.
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Increasing the surface area 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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12.
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Stirring increases the rate of dissolution because it
a. | raises the temperature. | b. | lowers the temperature. | c. | brings fresh solvent
into contact with the solute. | d. | decreases surface area of the
solute. |
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13.
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If the amount of solute present in a solution at a given temperature is less
than the maximum amount that can dissolve at that temperature, the solution is said to be
a. | saturated. | c. | supersaturated. | b. | unsaturated. | d. | concentrated. |
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14.
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Which of the following is an example of a polar solvent?
a. | carbon tetrachloride | c. | water | b. | benzene | d. | gasoline |
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15.
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Which of the following is an example of a nonpolar solvent?
a. | water | c. | both a and b | b. | carbon tetrachloride | d. | neither a nor b |
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16.
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Which of the following is soluble in water?
a. | potassium nitrate | c. | benzene | b. | silver | d. | carbon
tetrachloride |
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17.
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Sugar is soluble in water because sugar molecules are
a. | massive. | c. | nonpolar. | b. | large. | d. | polar. |
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18.
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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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19.
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What is the molarity of a solution that contains 1.5 mol KCl in 3.00 L
solution?
a. | 0.5 M | c. | 0.4 M | b. | 4.5 M | d. | 1.5 M |
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20.
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What is the molarity of a solution that contains 20. g NaOH in 4.00 L
solution?
a. | 0.13 M | c. | 8.0 M | b. | 0.50 M | d. | 20 M |
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21.
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How many moles of HCl are present in 0.50 L of a 2 M HCl solution?
a. | 1.0 mol | c. | 0.5 mol | b. | 2.0 mol | d. | 2.0 mol |
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22.
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An NaOH solution contains 2 mol of NaOH, and its concentration is 0.5 M. What is
its volume?
a. | 0.5 L | c. | 1.05 L | b. | 0.2 L | d. | 4.0 L |
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23.
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What causes water's low vapor pressure?
a. | dispersion forces | c. | hydrogen bonding | b. | covalent bonding | d. | ionic
attractions |
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24.
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Which of the following usually makes a substance dissolve faster in a
solvent?
a. | agitating the solution | b. | increasing the particle size of the
solute | c. | lowering the temperature | d. | decreasing the number of
particles |
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25.
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What is the molarity of a solution that contains 6 moles of solute in 2 liters
of solution?
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26.
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What is the molarity of 200 mL of solution in which 2.0 moles of sodium bromide
is dissolved?
a. | 2.0 M | c. | 0.40 M | b. | 10 M | d. | 4.0 M |
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27.
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The amount of heat needed to melt one mole of a solid at a constant temperature
is called ____.
a. | molar heat of vaporization | c. | heat of
reaction | b. | molar heat of fusion | d. | enthalpy |
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28.
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During a phase change, the temperature of a substance ____.
a. | increases | c. | remains constant | b. | decreases | d. | may increase or
decrease |
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29.
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In a metallic bond, electrons are _____________ .
a. | held tightly. | c. | held loosely and flow freely. | b. | not
shared. | d. | paired
evenly. |
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30.
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A solution of sugar contains 35 grams of sucrose,
C12H22O11 in 100 mL of solution. What is the concentration in parts
per million of the solution?
a. | 25 ppm | c. | 5,000,000 ppm | b. | 350,000 ppm | d. | 0.76 ppm |
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31.
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What is going on in the area between D and E?
a. | melting | c. | condensing | b. | freezing | d. | boiling |
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32.
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What phase(s) of matter are present between C and D?
a. | Solid | c. | liquid | b. | liquid and solid | d. | liquid and gas |
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33.
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A KCl solution contains 149.1 g of KCl (molar mass 74.55 g/mol) in 4000 mL of
solution. What units do the amount of solute and the volume of solution need to be in to obtain
the molarity of 0.5 M?
a. | mol and L | c. | grams and L | b. | grams and mol | d. | mol and cubic
centimeters |
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34.
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Which of the following is true about ionic crystals?
a. | They consist of molecules held together by intermolecular forces. | c. | Their structure
consists of positive and negative ions arranged in a regular pattern. | b. | They are
polar. | d. | They are atomic
solids. |
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35.
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Liquid in a sealed container kept at constant pressure will show no change in
its vapor pressure. Why is this?
a. | particles stay in the liquid form and do not vaporize into gas | c. | gas particles above
the liquid do not condense into liquid | b. | liquid and gas particles are condensing and
vaporizing at the same rate producing an equilibrium | d. | none of these |
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36.
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40 g of NaCl at 50 °C in 100g of water would be considered a(n) _________
solution.
a. | saturated | c. | supersaturated | b. | unsaturated | d. | none of these |
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37.
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85 g of NaNO3 at 15 °C in 100 g of water would be considered
a(n) _________ solution.
a. | saturated | c. | supersaturated | b. | unsaturated | d. | none of these |
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