unit C6 chemistry out their part 1

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  • unit C6 chemistry out their
    • CFC's and the ozone
      • ozone is O3 this is how CfC'sdamage the ozone
    • softening water
      • washing soda is sodium carbonate when this is added to hard water a precipitation reaction happens the water softens as the calcium and magnesium ions in the hard water are removed as a solid precipitate
    • fats and oils
      • tryglycrols all of these have a glycerol head and three hydrocarbon tails
      • you can do an addition reaction with bromine and fat to show it has a double bond
      • key words
        • immiscible = doesn't mix different density's
        • emulsions = makes to substances that don't mix mix two examples oil in water like milk or water in oil like butter or margarine
      • hydrogenation is when they get vegetable oil a H2 ion to make saturated vegetable fat
    • electrolysis
      • their are two types of ion in electrolysis an
        • anion it is attracted to he anode it is a negative ion and a non metal
        • cations are attracted to the cathode they are positive ions and metals
      • ions are discharged at the electrodes
      • electrolysis of water
        • water can be ionised by the presence of an ionic substance in it so to electrolyse water you add a small amount of sulphuric acid it it before you electrolyse it
        • hydrogen is given off at the cathode the half equation for it is H+ + e- ---> H2
          • this is reduction
          • Untitled
        • oxygen is given of at the anode the half equation for it is 2O2- ---> O2+ 4e-
          • this is oxidation
      • you have TO BALNCE THE AMOUNT OF ELECTRONS AT THE ANODE AND THE CATHODE

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