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Hydrocarbons (Alkanes (first 4 Mice Eat Peanut Butter (Methane, Ethane,…

- - - - more runny (less viscous)
      - more volatile, lower bp
      - more flammable, easier to ignite
      - E.g used for bottled gas, stored as liquid under pressure
- - - - Heated till most of it is gas. Gas enters FC
      - In column temperature gradient, hottest at bottom
      - Longer HC have high BP, condense early
        & drain out early on, near the bottom
      - Each fraction has similar number of C atoms
  - - - polymers, solvents, lubricants, detergents
    - - short HC big demand as flammable, good fuels
      - as well as alkanes, also alkenes,
        useful for other starting material
      - Thermal decomposition , ie breakdown by heating
        
        vapourise to gas
        
        catalytic cracking
        
        vapour passed over hot powdered
        aluminium oxide catalyst
        
        long chain split on surface of catalyst
        
        steam cracking
        
        mix with steam then heat to
        very high temperature
- - - - complete, H20, CO2
      - incomplete,
        
        also get C and CO (posionous gas)
        
        smoky yellow flame and less energy
    - - C=C functional group so work in similar ways
      - usually this bond open to leave single bond
      - Addition of H called is known as Hydrogenation
      - Addition with Halogen, molecule formed are saturated
        
        bromine water can be used for test, add and shake
        
        with alkane stay bright orane, with alkene turns colourless
      - With steam to form alcohol
        
        one way to make ethanol
        
        passed to condenser with ethanol and alcoho have higher
        bp so condense and unreacted ethene gas recycled
        
        purified from mixture by fractional distillation