We can change the state of materials by
heating or cooling them
What is a chemical reaction?
When substances are mixed together and form a solid
When substances are mixed together and stay the same
When substances are mixed together and form a new substance
What happens to the substances in a chemical reaction?
the substances react together
the substances don't change
the substances explode
What chemical reaction is this ?
Making cement from cement powder, sand, water and limestone
What chemical reaction is this ?
It's burning wood .
What chemical reaction is this ?
The tin can is rusting.
What new substances form when we burn wood ?
A grey substance called ash and two different gases form
What chemical reaction has happened to this car .
The car is rusting
