1.4 Activity 5 : Defining diffusion, diluting and dissolving Gases can diffuse into each other . This is because the particles in a gas are in a...

Particle theory explains why the smell of cooking in the kitchen can quickly be smelt by people in other rooms.

 1.3 Activity 4. A particular problem  Students should: 1.3 understand how the results of experiments involving the dilution of coloured sol...

Solid, liquid or gas?

 1.1 Introducing the states Matter can exist in one of three fundamental states: Solid, Liquid or Gas Here we consider the way in which these thr...