Part 5

Which of the following statements concerning gas molecules is incorrect? a. Attraction is greater between fast-moving molecules than between slow-moving molecules. b. Real molecules have a weak attraction for each other. c. Real molecules have the greatest attraction for each other at low temperatures. d. Real molecules have the greatest attraction for each other at high pressures. e. Real molecules occupy a finite space.

a. Attraction is greater between fast-moving molecules than between slow-moving molecules.

Which of the following statements is least likely to be true of a sample of nitrogen gas at STP? a. Collisions between the gaseous molecules are elastic. b. The intermolecular forces between nitrogen molecules are not negligible. c. Molecules of gaseous nitrogen are in constant random motion. d. The average kinetic energy of the gaseous nitrogen is proportional to the absolute temperature of the gas. e. The pressure exerted by gaseous nitrogen is due to collisions of the molecules with the walls of the container.

b. The intermolecular forces between nitrogen molecules are not negligible.

A flexible vessel is filled to a certain pressure with a gas. Under conditions of constant temperature and moles of gas, how does the pressure of the gas change when the volume of the gas is doubled? a. The pressure decreases by a factor of three b. The pressure increases by a factor of two. c. The pressure remains the same. d. The pressure decreases by a factor of two. e. The pressure decreases by a factor of four.

d. The pressure decreases by a factor of two.

Absolute zero is the point at which a. a straight-line graph of V versus T (°C) intersects the origin. b. a straight-line graph of 1/V versus P at constant T intersects the origin. c. gaseous helium liquefies. d. a straight-line graph of V versus 1/P at constant T intersects the origin. e. a straight-line graph of V versus T (K) intersects the origin.

e. a straight-line graph of V versus T (K) intersects the origin.