What is true of all particles of gas enclosed within a container?

They move at different speeds.

They have the same kinetic energy.

They never collide with each other.

They move at different speeds

If you have a conglomerate of gas particles:

1. At least one of the gas particles moves at a different speed. This is a result of the particles colliding with one another and transferring kinetic energy between particles. The temperature is simply a measure of the average kinetic energy of all the particles, and does not mean that all the particles have the same specific kinetic energy.

2. They do not have the same kinetic energy because they collide with each other as explained above.

3. They collide with each other unless the temperature is 0 K, in which case they are not moving at all.

If the temperature is not 0 K, none of the statements are true. If the temperature is 0 K, all of the statements are true.