Chemistry C1 AQA Triple Award GCSE part 3

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  • Created by: pixar
  • Created on: 20-06-14 12:41
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  • Chemistry C1 AQA Triple Award GCSE
    • using limestone
      • limestone is mainly calcium carbonate (CaCO3)
        • limestone is quarried out of the ground
          • it is great for making blocks for building
            • fine old buildings like cathedrals are made from these blocks
            • its sturdy but does react
        • when heated it thermally decomposes into calcium oxide and carbon dioxide
        • calcium carbonate reacts with acid to make a calcium salt, carbon dioxide and water
      • calcium oxide reacts with water to produce calcium hydroxide
        • calcium hydroxide is an alkali
          • this can be used to neutralise acidic soil
            • powdered limestone can be used to do this too but calcium hydroxide is faster
        • calcium hydroxide can be used to terst for carbon dioxide
          • if you bubble gas through limewater and it turns cloudy carbon dioxide is present
      • limestone can make other things too
        • powdered limestone is heated in a kiln with powdered clay to make cement
      • limestone quarry
        • limestone pic
    • using limestone continued
      • quarrying limestone disrupts the environment
        • digging limestone causes environmental problems
        • it leaves huge holes in the landscape
        • using explosives causes dust and loud noises in quiet areas
        • quarrying destroys habitats
      • positives
        • limestone creates things people want
          • houses, roads, dyes, paints and medicines
        • limestone products used to neutralise acidic things
          • soil, lakes, rivers and sulpher dioxide
        • creates jobs
        • once quarrying is complete landscaping and restoration of the area is required
      • advantages and disadvantages
        • advantages
          • cheap
          • easy to cut
          • widely avaliable
          • hard wearing
          • attractive
          • doesn't rot
          • can't be gnawed away by insects and rodents
          • fire resistant
          • doesn't corrode
        • disadvantages
          • has a low tensile strength


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