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**This Powerpoint specifically covers all criteria for –
Unit 2.1.2 Particle Model SUPPLEMENT
**
Know that the forces and distances between particles (atoms, molecules, ions and electrons) and the motion of the particles affects the properties of solids, liquids and gases
Describe the pressure and the changes in pressure of a gas in terms of the forces exerted by particles colliding with surfaces, creating a force per unit area
Know that microscopic particles may be moved by collisions with light fast-moving molecules and correctly use the terms atoms or molecules
as distinct from microscopic particles
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