Particles
- Created by: catherinelovesxmen
- Created on: 26-09-19 10:06
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- Particles
- The Particle Model
- Particles are tiny pieces of matter.
- SOLID: Regularly arranged, very close together and they vibrate about fixed positions.
- Can't compress a solid as there is no space for the particles to move.
- Particles can't flow as they vibrate around fixed positions.
- LIQUID: Randomly arranged, close together and they move around each other.
- GAS: Randomly arranged, far apart and move quickly in all directions.
- Matter is made out of particles.
- Physical Changes
- When a substance changes shape or state, or breaks.
- NO NEW SUBSTANCE IS MADE IN A PHYSICAL CHANGE.
- Examples: freezing juice, melting ice and dissolving sugar.
- CHANGING STATE
- Particles stay the same.
- Arrangement and movement change.
- Chemical Changes
- NEW SUBSTANCE IS MADE IN A CHEMICAL CHANGE.
- Properties of new substances are often very different to the original.
- Most chemical changes are difficult or impossible to reverse.
- Examples: cooking, steel rusting and acids reacting with alkalis.
- Particles break up and join together differently.
- Limitations of Particle Model (H)
- Ratio of distance to diameter = distance between atoms / diameter of atom.
- ELECTROSTATIC FORCES are the attractions between particles.
- EF is strongest between solids and weakest in gases.
- Limitations
- Forces between particles.
- Size of particles.
- Space between particles.
- The Particle Model
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