Physical changes

1

What happens to the particles when a piece of rock is heated up?

2

What happens to a bar of steel when it is cooled down?

3

What happens to the pressure in a metal spray can when it is heated up?

4

Why do gases exert a pressure on the walls of their container?

5

What process causes smelly gases to spread around a room on their own?

6

In which state are atoms closest together (except water)?

7

In which state do atoms have the most energy?

8

What is the transition from a solid to a gas called?

9

What happens to temperature when a state change occurs?

10

In which state is water most dense?