Question

1. what happens to gases when the temperature is increased? 16) what happens to the volume of a container containing a gas, when the gas is cooled? 17) what causes gas pressure? 18) what happens when one gas molecule collides with another? 19) in the kinetic - molecular theory, collisions are elastic and transfer 100% energy. true false

Explanation:

1. When the temperature of a gas is increased, according to the kinetic - molecular theory, the average kinetic energy of gas molecules increases. The molecules move faster and collide more frequently and with greater force against the walls of the container.
2. When a gas in a container is cooled, assuming constant pressure, the volume of the container decreases. This is in accordance with Charles's law ($V/T = k$, where $V$ is volume, $T$ is temperature, and $k$ is a constant for a fixed amount of gas at constant pressure).
3. Gas pressure is caused by the collisions of gas molecules with the walls of the container. Each collision exerts a force on the wall, and the cumulative effect of these numerous collisions over time results in pressure.
4. When one gas molecule collides with another, there is an exchange of momentum and kinetic energy. The total momentum and total kinetic energy of the system of the two - molecule gas are conserved in an elastic collision (which is assumed in the kinetic - molecular theory for ideal gases).
5. In the kinetic - molecular theory, collisions of gas molecules are elastic, meaning that there is no net loss of kinetic energy during the collision, and energy is transferred between molecules without any dissipation. So the statement "In the kinetic - molecular theory, collisions are elastic and transfer 100% energy" is True.

Answer:

1. The average kinetic energy of gas molecules increases, and they move faster and collide more frequently and with greater force against the container walls.
2. The volume of the container decreases (assuming constant pressure).
3. Collisions of gas molecules with the walls of the container.
4. There is an exchange of momentum and kinetic energy.
5. True