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Behaviour of matter - Test

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?