What is the key feature of a physical change?

What do physical changes include?

Why can physical changes be easily reversed?

What is the simplest example of a physical change?

When else does a physical change occur?

What happens to solids, liquids and gases when they are heated?

What happens when expansion occurs?

What happens when a solid, liquid or gas is cooled?

What happens when contraction occurs?

What happens if enough heat is applied to a substance?

Gas - Liquid

Liquid - Solid

Solid - Gas

Gas - Solid

What is a solution?

What is crystallization?

How can you distinguish between a chemical and a physical change?

How can you detect the presence of a new substance?