True/False
Indicate whether the
statement is true or false.
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1.
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Pressure is a direct result of
collisions between gas particles and the walls of their container.
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Multiple
Choice
Identify the letter
of the choice that best completes the statement or answers the question.
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2.
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In the equation C +
O2(g) →
CO2(g), one volume of O2 yields how many volumes of
CO2?
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3.
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A 1.00 L sample of a gas has a
mass of 1.92 g at STP. What is the molar mass of the gas?
a. | 1.92
g/mol | c. | 22.4
g/mol | b. | 19.2 g/mol | d. | 43.0 g/mol |
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4.
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Which is a common unit for the
ideal gas constant R?
a. | L·atm | c. | 
| b. | mol·K | d. |  |
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5.
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What is the pressure exerted by
1.2 mol of a gas with a temperature of 20.˚C and a volume of 9.5 L?
a. | 0.030
atm | c. | 3.0
atm | b. | 1.0 atm | d. | 30. atm |
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6.
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A gas sample with a mass of
0.686 g is collected at 20.˚C and 722.5 mm Hg. The volume is 350. mL. What is the molar mass of
the gas?
a. | 0.31
g/mol | c. | 50.
g/mol | b. | 2.2 g/mol | d. | 720 g/mol |
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7.
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For reactants or products that
are gases, the coefficients in the chemical equation indicate
a. | the number of grams of each
substance. | b. | volume. | c. | molar volume. | d. | density. |
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8.
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If the volume of the gaseous
reactants and products in the equation 2C2H6 + 7O2 → 4CO2 + 6H2O are measured at 1
atm and 25˚C, the substance that could not be included in the volume relationship has what
formula?
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9.
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An ethylene gas torch requires
3200 L of gas at 3.00 atm. What will be the pressure of the gas if ethylene is supplied by a 250.0 L
tank?
a. | 0.231
atm | c. | 38.4
atm | b. | 2.34 atm | d. | 45.4 atm |
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10.
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Gas is confined in a metal tank
in the figure. At 20.20°C, the gas exerts
a pressure of 8.532 atm. After heating the tank, the pressure of the gas increases to 10.406 atm.
What is the temperature of the heated gas?
a. | -32.60°C | c. | 84.59°C | b. | 24.63°C | d. | 92.64°C |
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11.
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A helium-filled balloon has a
volume of 50.0 L at 25°C and 1.08 atm. What volume will it have at .855 atm and
10.0°C?
a. | 15.0 L | c. | 60.0 L | b. | 30.0 L | d. | 120.0 L |
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12.
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A gas is confined in a steel
tank with a volume of 6.982 L. At 20.20°C, the gas exerts a pressure of 8.532 atm. After heating
the tank, the pressure of the gas increases to 10.406 atm. What is the temperature of the heated
gas?
a. | –32.60°C | c. | 84.59°C | b. | 24.63°C | d. | 92.64°C |
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13.
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How many moles of helium gas
are contained in a 4.0-L flask at STP?
a. | 0.045
mol | c. | 0.17
mol | b. | 0.089 mol | d. | 89 mol |
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14.
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A steel tank with a volume of
9.583 L contains N2 gas
under a pressure of 4.972 atm at 31.8 °C. Calculate the number of moles of N2 in the
tank.
a. | 0.002
mol | c. | 0.525
mol | b. | 0.018 mol | d. | 1.90 mol |
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15.
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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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16.
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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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17.
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Which of the following
decreases the average speed of solvent molecules?
a. | increasing the
temperature | c. | adding more
solvent | b. | stirring the solution | d. | decreasing the temperature |
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18.
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Which of the following will
dissolve most rapidly?
a. | sugar cubes in cold
water | c. | powdered sugar in cold
water | b. | sugar cubes in hot water | d. | powdered sugar in hot water |
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19.
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In the expression like
dissolves like, the word like refers to similarity in molecular
a. | mass. | c. | energy. | b. | size. | d. | polarity. |
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20.
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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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21.
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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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22.
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An NaOH solution contains 1.90
mol of NaOH, and its concentration is 0.555 M. What is its volume?
a. | 0.623 L | c. | 1.05 L | b. | 0.911 L | d. | 3.42 L |
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