C1.1 The Particle Model

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  • C1.1 The Particle Model
    • Physical Changes
      • Easy to reverse
      • No new substances are formed
      • Particle arrangement changes
    • Chemical Change
      • Difficult / impossible to reverse
      • New substances are formed
      • Particles break up and then join together in different ways
    • Describes how particles are arranged and how they move
      • Gas
        • Move quickly in all directions
      • Liquid
        • Move around eachother
      • Solid
        • Vibrate around fixed points
    • You cannot compress a solid
      • This is because there is no space for the particles to move to
    • Solid substances have fixed shapes and cannot flow
      • This is because particles vibrate around fixed positions and cannot move from place to place

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