chemistry

chemistry

1. states of matter

   • solid
     • strong force of attraction between the particles
     • particles do not move
   • liquid
     • weak force of attraction between the particles
     • free to move
   • gas
     • very weak force of attraction between the particles
     • far apart

2. movement of particles

   • diffusion is the gradual movement of particles from places where there are lots of them to places where there are fewer of them
   • particles spread out

3. atoms

   • the nucleus
     • middle of atom
     • contains protons and neutrons
     • positive charge because of protons
     • tiny
   • electrons
     • move around the nucleus in shells
     • negatively charged
     • no mass
   • molecules are groups of atoms

4. elements, compounds and mixtures

   • elements are one type of atom only
   • compounds are chemically bonded
   • 2 or more different elements
   • mixture is a lot of different elements

5. filtration and crystallisation

   • filtration
     • seperate a insoluble solid from a liquid
   • crystallisation
     • separate a soluble solid from a solution

6. chromatography

   • different dyes move up the paper at different rates
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