we believed that the molecules of a gas move around fairly rapidly, we can use this to explain all of the following EXCEPT

why adding more gas increases the pressure.

why most of the volume of the gas sample is taken up by the gas molecules.

why the gas molecules do not settle out on the bottom of the container.

why gas pressure rises with increasing temperature.

To determine the correct answer, let's analyze each option individually:

1. "Why adding more gas increases the pressure": This can be explained using the kinetic theory of gases. As we add more gas molecules to a container, the number of gas molecules per unit volume increases. Since the molecules are in constant motion, they collide more frequently with the walls of the container, resulting in an increase in the pressure exerted by the gas.

2. "Why most of the volume of the gas sample is taken up by the gas molecules": This can also be explained by the kinetic theory of gases. Gas molecules are in constant motion, and their motions are random and independent. This random motion allows the gas molecules to fill the entire available space within the container, occupying most of the volume.

3. "Why the gas molecules do not settle out on the bottom of the container": This is related to the nature of gases. Unlike liquids or solids, gas molecules have enough kinetic energy to overcome the force of gravity. As a result, they do not settle at the bottom of the container but instead distribute themselves throughout the available space.

4. "Why gas pressure rises with increasing temperature": This can be explained using the ideal gas law and the kinetic theory of gases. When the temperature of a gas increases, the average kinetic energy of the gas molecules also increases. The increased kinetic energy leads to more frequent and energetic collisions with the container walls, resulting in an increase in gas pressure.

Based on the explanations provided, the correct answer is "why most of the volume of the gas sample is taken up by the gas molecules." The kinetic theory of gases explains that gas molecules fill the entire space within a container, occupying most of the volume.