The Limestone Cycle and its uses.

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  • Created by: beckymale
  • Created on: 17-05-16 20:07
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  • LIMESTONE CYCLE C1
    • Calcium Carbonate - CACO3
      • LIMESTONE.
        • HEATED with CLAY makes CEMENT
          • CEMENT mixed with SAND to make MORTAR
          • CEMENT with SAND and AGGREGATE makes CONCRETE.
            • Cement is quick and cheap. Hideously unattractive.
              • Doesn't corrode. But has LOW TENSILE STRENGTH. It can crack, but steel bars can reinforce it.
        • ADVANTAGE: provides HOUSES and ROADS. DYES, PAINTS and MEDICINES from limestone. NEUTRALISEmore jobs, local economy. Improvements in roads and recreation facilities. Landscaping and restoration after.
        • DISAD. explosives cause DUST and NOISE. Permanently damages landscape, destroys HABITATS, TRANSPORTATION via lorries - more NOISE and POLLUTION, waste materials = UNSIGHTLY.
          • ADVANTAGE: provides HOUSES and ROADS. DYES, PAINTS and MEDICINES from limestone. NEUTRALISEmore jobs, local economy. Improvements in roads and recreation facilities. Landscaping and restoration after.
        • Cheaper than granite or marble. Easy to cut. More hard-wearing, but still attractive.
        • Doesn't rot like wood, can't be gnawed by insects. FIRE RESISTANT.
    • THERMAL DECOMPOSITION
    • Calcium Oxide CAO
    • ADD WATER
    • Calcium Hydroxide CA(OH)2
      • ALKALINE. Used to neutralise acids e.g. sulphur dioxide causes acid rain which makes lakes and soils acidic. This kills plants and animals & creates dead zones
        • Powdered limestone can be used for this too but hydroxide works much quicker.
    • ADD MORE WATER
    • Calcium Hydroxide Solution CA(OH)2 (aq)
      • Limewater. Reacts with CO2 to produce Calcium Carbonate -  Used as a test for CD (Turns cloudy if present)
    • ADD CO2

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