Alkenes

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  • Alkenes
    • Cracking
      • Alkane- Heated with steam and a catalyst
        • Thermal decomposition
        • Forms alkanes and alkenes
          • Alkenes react with bromine turning it form orange to colourless-  proves it has been made
      • Smaller more useful molecules
    • Formula= CnH2n
    • Unsaturated
      • 2 covalent bonds
    • Ethene molecule
      • 1 atom can only have 4 bonds joined to it
      • Can be produced by hydration of ethene with steam and a catalyst
        • Hydration
      • Or fermentation with yeast: sugar-> carbon dioxide +ethanol
    • Propane molecule
      • 1 atom can only have 4 bonds joined to it

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