MaterialChanges

Solid ice change back to liquid water is an example of r (a)   change.

H (a)   causes the ice to melt.

When the water l (a)   heat and cools it becomes solid again.

The changes that cannot be reversed is called i (a)   changes.

Some changes cause a new substance to f (a)   .

A m (a)   is make up of two or more different substances mixed together.

The substance in a mixture are not c (a)   joined and so we can separate them.

Mixtures can be solids, liquids and g (a)   .

Air is a mixture of three main gases; nitrogen, o (a)   and carbon dioxide.

The substances in a mixture do not r (a)   with each other.