Solid ice change back to liquid water is an example of r______ change.

H_____ causes the ice to melt.

When the water l_____ heat and cools it becomes solid again.

The changes that cannot be reversed is called i______ changes.

Some changes cause a new substance to f_____.

A m_____ is make up of two or more different substances mixed together.

The substance in a mixture are not c_______ joined and so we can separate them.

Mixtures can be solids, liquids and g_____.

Air is a mixture of three main gases; nitrogen, o_____ and carbon dioxide.

The substances in a mixture do not r______ with each other.