When a solid becomes a liquid, we call this melting.

When we increase the thermal energy of matter, it expands.

When we crush a drinks can, this is an example of reversible physical change.

What type of change is combustion?

What does fire need in order to burn?

What do we call oxidised iron?

What colour is oxidised fruit?

What reaction converts the carbohydrates in milk into lactic acid?

Oxidation, fermentation or combustion?

When we cut an apple into pieces, it begins to turn brown.

Oxidation, fermentation or combustion?

When we light a candle, it produces light and heat.

Oxidation, fermentation or combustion?

Old cars often go rusty and have orange or red areas.

Oxidation, fermentation or combustion?

We use yeast to make bread, cakes, wine and beer.

Oxidation, fermentation or combustion?

Bacteria convert the carbohydrates in milk into lactic acid.

Oxidation, fermentation or combustion?

In many power stations, coal is burned to produce electricity.

Yeast can be used in fermentation.

Combustion can cause many problems, such as global warming or...

Combustion produces thermal, light, sound energy and also...

The reactions that produce thermal energy are called...

A physical change is reversible.