- Use ICT simulation to show pupils how to model a change,
eg some solid dissolving in water, by representing the particles themselves, making sure that those representing the solid are clearly distinguishable from those representing the water. Ask groups of pupils to work out how to model other changes,
eg adding an insoluble solid to water, the formation of a suspension, separation by chromatography of two solutes, the evaporation of a solution. Help pupils to write a brief description of each change.
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- show by modelling how particles behave in some changes
- describe what the models show,
eg when marble is added to water it doesn't break up into smaller particles, so the particles can't mix together
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