AQA GCSE Chemistry Unit 1 6.1 Using Plant oils

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  • Using Plant oils
    • Extracting
      • Havested plant material is sieved to remove stones that could damage machinery
        • Crushed so seeds are broken open forming a mixture of oil and seed
          • Squashed and pressed so oil and water is released
            • Water is drained
              • Oil filtered and heated to remove bacteria and remnants of water
      • can be used as foods. Oils have high-energy content and high in nutrients
      • Vegetable oils have HIGHER boiling points than water so can cook foods at higher temperatures than water
        • Quicker cooking
        • Increases energy of food
        • Different flavours
      • Can be used for Biodiesel- contains oxygen so they burn cleanly
        • Carbon neutral (absorbs as much carbon as is given out)
        • Biodegradable
        • Renewable
        • Less SO2 and less particulates
        • Produces more NO2
        • Land taken up when growing the plants
    • Emulsions
      • Oil-in-water oil droplets in water
      • Water-in-oil water droplets in oil
      • A mixture of two immisible liquids
      • Uses..
        • cosmetics
        • Paints
        • Food
    • Hardening vegetable oils
      • Oils liquid at room temp. (unsaturated) C=C
        • Hydrogenation
          • Unsaturated oil reacts with hrdrogen at 60*C with a nickel catalyst
      • Fats solid at room temp. (saturated) C-C


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