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CH1012
PHASES
Phases (states of matter)
Gas     - particles are very mobile (km / s)
            - large average interparticle distance
            - fills container, no surface, low r
              eg. H2 = homonuclear diatomic
Liquid - particles are mobile (mm / s)
            - small interparticle distance
            - fills container, forms a surface
Solid   - particles non mobile and in contact
    - fixed shape, high r
    Amorphous - SiO2 - glass
    Crystalline  - SiO2 - quartz