Behaviour of matter - Test Bite

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

they get bigger
they get smaller
they stay the same size

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

it gets longer
it gets shorter
it stays the same length

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

it increases
it decreases
it stays the same

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

the gas particles hit each other
the gas particles move quickly in all directions
the gas particles hit the container walls

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

refusion
diffusion
diffraction