Compounds and Mixtures.

Solid (box 1): Tightly packed, no overlaps

Liquid (box 2): Less packed, overlaps, two always have to stick together

Gas (box 3): Less Molecules, not packed = more space for molecules to move

Box 1 Box 2 Box

When a chemical reaction takes place there will be a change in the colour/heat. It will form a solution.

e.g.

Water + Juice