Gases ❮ 115❯ Review Questions
Use these questions to review the content of this chapter and practice for the AP Chemistry
exam. First are 20 multiple-choice questions similar to what you will encounter in Section I
of the AP Chemistry exam. Following those is a long free-response question like the ones
in Section II of the exam. To make these questions an even more authentic practice for the
actual exam, time yourself following the instructions provided.Multiple-Choice Questions
Answer the following questions in 30 minutes. You may not use a calculator. You may use
the periodic table and the equation sheet at the back of this book.- A sample of argon gas is sealed in a container.
The volume of the container is doubled. If the
pressure remains constant, what happens to the
absolute temperature?
(A) The temperature does not change.
(B) The temperature is halved.
(C) The temperature is doubled.
(D) The temperature is squared. - A sealed, rigid container is filled with three ideal
gases: A, B, and C. The partial pressure of each
gas is known. The temperature and volume of
the system are known. What additional informa-
tion is necessary to determine the masses of the
gases in the container?
(A) the average distance traveled between molec-
ular collisions
(B) the intermolecular forces
(C) the molar masses of the gases
(D) the total pressure - Two balloons are at the same temperature and
pressure. One contains 14 g of nitrogen, and the
other contains 20.0 g of argon. Which of the
following is true?
(A) The density of the nitrogen sample is greater
than the density of the argon sample.
(B) The average speed of the nitrogen molecules
is greater than the average speed of the argon
molecules.
(C) The average kinetic energy of the nitrogen
molecules is greater than the average kinetic
energy of the argon molecules.
(D) The volume of the nitrogen container is less
than the volume of the argon container.
4. An experiment to determine the molar mass
of a gas begins by heating a solid to produce a
gaseous product. The gas passes through a tube
and displaces water in an inverted, water-filled
bottle. Which of the following may be deter-
mined after the experiment is completed?
(A) vapor pressure of water
(B) temperature of the displaced water
(C) barometric pressure in the room
(D) mass of the solid used
5. The true volume of a real gas is larger than that
calculated from the ideal gas equation. This
occurs because the ideal gas equation does not
consider which of the following?
(A) the attraction between the molecules
(B) the shape of the molecules
(C) the volume of the molecules
(D) the mass of the molecules
6. A 1.00 mole sample of ammonia gas, NH 3 , is
placed in a flask. Ammonia will be most nearly
ideal under which of the following sets of condi-
tions?
(A) 250 K and 0.1 atm
(B) 350 K and 0.1 atm
(C) 350 K and 1 atm
(D) Ammonia will behave the same under all
conditions.