Unit 3: Gases

31. According to the kinetic molecular theory, the average kinetic energy of gas molecules is proportional to:

a) The density of the gas
b) The pressure of the gas
c) The volume of the gas
d) The temperature of the gas
Answer: d) The temperature of the gas

32. If the volume of a gas is halved while the temperature remains constant, what happens to the pressure?

a) It is halved
b) It doubles
c) It remains unchanged
d) It decreases
Answer: b) It doubles

33. Which gas law relates the pressure, volume, and temperature of a gas sample?

a) Charles’s law
b) Boyle’s law
c) Gay-Lussac’s law
d) Combined gas law
Answer: d) Combined gas law

34. The term “molar volume” refers to:

a) The volume of one mole of a gas at a specific temperature and pressure
b) The volume of a gas mixture
c) The volume of a gas in a reaction
d) The volume occupied by one mole of any substance
Answer: a) The volume of one mole of a gas at a specific temperature and pressure

35. The law stating that at constant temperature, the volume of a gas is directly proportional to the number of moles is:

a) Avogadro’s law
b) Charles’s law
c) Boyle’s law
d) Gay-Lussac’s law
Answer: a) Avogadro’s law

36. If two gases are at the same temperature and pressure, which of the following is true about their volumes?

a) They must be the same
b) Their volumes are inversely proportional to their pressures
c) Their volumes are directly proportional to their densities
d) Their volumes depend on their molecular weights
Answer: a) They must be the same

37. In which of the following scenarios would a gas deviate most from ideal behavior?

a) Low pressure and high temperature
b) High pressure and low temperature
c) Low pressure and low temperature
d) High pressure and high temperature
Answer: b) High pressure and low temperature

38. The term “volume” in the ideal gas law refers to:

a) The volume of the container holding the gas
b) The volume of the gas itself
c) The volume of the gas molecules
d) The volume of the solvent in which the gas is dissolved
Answer: a) The volume of the container holding the gas

39. The partial pressure of a gas can be determined using:

a) Dalton’s law
b) Graham’s law
c) Charles’s law
d) Avogadro’s law
Answer: a) Dalton’s law

40. The gas law that describes the relationship between temperature and pressure when volume is constant is:

a) Boyle’s law
b) Charles’s law
c) Gay-Lussac’s law
d) Avogadro’s law
Answer: c) Gay-Lussac’s law