C1.1: The particle model
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- Created on: 24-03-18 18:10
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- C1.1 = The particle model
- C1.1.1 Introducing particles
- Solids: Particles have no room to move and can only vibrate.
- Liquids: Particles have little room to move and can vibrate.
- Gases: Particles have lots of room to move around rapidly and vibrate a lot.
- when a substance is changing state, the temperature stays the same.
- Solid to liquid: Melting
- Liquid to Gas: Evaporating/ Boiling
- Gas to Liquid: Condencing
- Liquid to Solid: Freezing
- C1.1.2 Chemical and physical changes
- A physical change happens when the substance changes state or shape, or breaks into pieces.(Reversible)
- Ice into water
- mixing sand and water
- Dissolving sugar in water
- A chemical change is a change that produces one or more new substances. (Impossible to reverse)
- Cooking any type of food
- Steel rusting
- Acid reacting with alkali to make salt and water
- When particles change state, the particles stay the same but their arrangements and movement changes
- However in chemical changes, the particles break up and then join together in different combonations
- A physical change happens when the substance changes state or shape, or breaks into pieces.(Reversible)
- C1.1.3 Limitations of the particle model
- There are electrostatic forces between particles
- C1.1.1 Introducing particles
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