Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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What is the SI unit of force?
a. | torr | c. | pound | b. | pascal | d. | newton |
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2.
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Convert the pressure 0.75 atm to mm Hg.
a. | 101.325 mm Hg | c. | 570 mm Hg | b. | 430 mm Hg | d. | 760 mm Hg |
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3.
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Convert the pressure 0.840 atm to mm Hg.
a. | 365 mm Hg | c. | 638 mm Hg | b. | 437 mm Hg | d. | 780 mm Hg |
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4.
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Convert the pressure 1.30 atm to kPa.
a. | 2 kPa | c. | 132 kPa | b. | 115 kPa | d. | 245 kPa |
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5.
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Standard temperature is exactly
a. | 100°C. | c. | 0°C. | b. | 273°C. | d. | 0 K. |
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6.
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To correct for the partial pressure of water vapor in a gas collection bottle,
the vapor pressure of H2O at the collecting temperature is generally
a. | subtracted from the partial pressure of the collected gas. | b. | added to the
pressure of the collected gas. | c. | subtracted from the atmospheric
pressure. | d. | added to the atmospheric pressure. |
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7.
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To observe the effects of changing pressure on the volume of a gas, factors that
must be kept constant are the gas's temperature and
a. | density. | c. | elasticity. | b. | quantity. | d. | kinetic energy. |
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8.
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If the temperature remains constant, V and P represent the
original volume and pressure, and V' and P' represent the new volume and
pressure, what is the mathematical expression for Boyle's law?
a. | P'V = V'P | c. | VP=
V'P' | b. | VV' =
PP' | d. |  |
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9.
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If the temperature of a fixed quantity of gas decreases and the pressure remains
unchanged,
a. | its volume increases. | c. | its volume decreases. | b. | its volume is
unchanged. | d. | its density
decreases. |
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10.
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The volume of a gas is 5.0 L when the temperature is 5.0°C. If the temperature is increased to 10.0°C without changing the pressure, what is the new volume?
a. | 2.5 L | c. | 5.1 L | b. | 4.8 L | d. | 10.0 L |
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11.
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Two gases have the same temperature but different pressures. The
kinetic-molecular theory does not predict that
a. | molecules in both gases have the same average kinetic energies. | b. | molecules in the
low-pressure gas travel farther before they collide with other molecules. | c. | both gases have the
same densities. | d. | all collisions of the molecules are elastic. |
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12.
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On a cold winter morning when the temperature is –13°C, the air pressure in an automobile tire is 1.5 atm. If the volume does
not change, what is the pressure after the tire has warmed to 15°C?
a. | –1.5 atm | c. | 3.0 atm | b. | 1.7 atm | d. | 19.5 atm |
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13.
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The pressure of a sample of gas at 10.0°C
increases from 700. mm Hg to 900. mm Hg. What is the new temperature?
a. | 0°C | c. | 39.0°C | b. | 364°C | d. | 90.9°C |
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14.
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If V, P, and T represent the original volume, pressure, and
temperature in the correct units, and V', P', and T' represent
the new conditions, what is the combined gas law?
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15.
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If 0.5 L of O2(g) reacts with H2 to produce 1 L of
H2O(g), what is the volume of H2O(g) obtained from 1 L of
O2(g)?
a. | 0.5 L | c. | 2 L | b. | 1.5 L | d. | 2.5 L |
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16.
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What is the number of moles of H 2 produced when 23 g of sodium react
with water according to the equation 2Na( s) + 2H 2O( l)  2NaOH( aq) +
H 2( g)? a. | 0.50 mol | c. | 2.0 mol | b. | 1.0 mol | d. | 4.0 mol |
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17.
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Equal volumes of diatomic gases under the same conditions of temperature and
pressure contain the same number of
a. | protons. | c. | molecules. | b. | ions. | d. | electrons. |
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18.
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According to Avogadro's law, 1 L of H2(g) and 1 L of
O2(g) at the same temperature and pressure
a. | have the same mass. | b. | have unequal volumes. | c. | contain 1 mol of gas
each. | d. | contain equal numbers of molecules. |
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19.
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At STP, the standard molar volume of a gas of known volume can be used to
calculate the
a. | number of moles of gas. | c. | gram-molecular
weight. | b. | rate of diffusion. | d. | gram-molecular volume. |
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20.
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Chlorine is produced by the reaction 2HCl(g) ® H2(g) + Cl2(g). How many grams of HCl
(36.5 g/mol) must be used to produce 10.0 L of chlorine at STP?
a. | 15.8 g | c. | 32.6 g | b. | 30.2 g | d. | 36.5 g |
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21.
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The ideal gas law is equivalent to Charles's law when
a. | the number of moles and the pressure are constant. | b. | the number of moles
and the temperature are constant. | c. | the volume equals 22.4 L. | d. | R equals
zero. |
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22.
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A sample of gas at 25°C has a volume of 11 L and
exerts a pressure of 660 mm Hg. How many moles of gas are in the sample?
a. | 0.39 mol | c. | 9.3 mol | b. | 3.9 mol | d. | 87 mol |
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23.
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A gas sample with a mass of 12.8 g exerts a pressure of 1.2 atm at 15°C and a volume of 3.94 L. What is the molar mass of the gas?
a. | 19 g/mol | c. | 64 g/mol | b. | 32 g/mol | d. | 128 g/mol |
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24.
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What determines the average kinetic energy of the molecules of any gas?
a. | temperature | c. | temperature and pressure | b. | pressure | d. | molar mass |
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Use the table below to answer the following questions.
Element | Atomic Mass | | Argon | 39.948 | | Bromine | 79.904 | | Carbon | 12.011 | | Chlorine | 35.453 | | Fluorine | 18.998 | | Helium | 4.0026 | | Hydrogen | 1.0079 | | Nitrogen | 14.007 | | Oxygen | 15.999 | | |
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25.
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How many times greater is the rate of effusion of oxygen gas than that of carbon
dioxide gas at the same temperature and pressure?
a. | 1.173 | c. | 2.173 | b. | 1.375 | d. | 6.633 |
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