The density of the gas will decrease, since the total mass of particles is constant but the volume is increased.
The gas will disperse to completely fill the cylinder. They will spread out more and be distributed evenly. This is due to the particles' random movement and tendency to occupy all accessible space. Verify that there are the same number of equally distributed particles in the student figure as there were at the beginning.
When a substance is heated, the molecules move faster and slightly farther apart, taking up more space and causing the density to decrease. When something is cooled, the molecules slow down and get a little closer together, taking up less space and becoming denser.
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