Science at key stage 3 (Year 7)

Unit 7G: Particle model of solids, liquids and gases

Where the unit fits in

This unit uses ideas developed in the key stage 2 programme of study. It builds on unit 4D 'Solids, liquids and how they can be separated', unit 5C 'Gases around us', unit 5D 'Changing state' and unit 6C 'More about dissolving' in the key stage 2 scheme of work.

This unit lays the foundation for subsequent work on particles.

Pupils will have many opportunities in later units to try to explain phenomena in terms of particles, eg dissolving in unit 7H 'Solutions', changes of state in unit 8I 'Heating and cooling', digestion in unit 8A 'Food and digestion', crystal size related to rate of cooling in unit 8H 'The rock cycle', the behaviour of gases in unit 9L 'Pressure and moments'.

Sections in this unit

This unit is divided into sections. Each section contains a sequence of activities with related objectives and outcomes. You can view this unit by moving through the sections or print/download the whole unit.


	1. How can we explain evidence from experiments?
	2. How are theories created?
	3. What are the differences between solids, liquids and gases?
	4. How can the particle model explain the differences between solids, liquids and gases?
	5. a. How can the particle model explain other phenomena?
	6. b. How can the particle model explain other phenomena?
	7. Reviewing work