Chemistry Revision

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  • Created by: mel
  • Created on: 21-05-13 20:32
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  • C1.2
    • Rocks and building material
      • Limestone and its uses
        • Limestone is made mainly of calcium carbonate.
          • The calcium carbonate in limestone breaks down when we heat it strongly to make calcium oxide and carbon dioxide.
            • This reaction is called thermal decomposition.
        • Limestone is widely used in the building industry.
        • Some types of limestone were formed from the remains of tiny animals that lived in the sea millions of years ago.
        • We dig out limestone from quarries.
        • Powdered limestone can also be heated with powdered clay to make cement.
          • When we mix cement powder with water, sand and crushed rock, a slow chemical reaction takes place.
            • This reaction produces a hard, stone like building material called concrete.
        • Heating limesone
          • The chemical formula for calcium carbonate is CaCO(3-)
            • It it made up of calcium ions, Ca(2+) and carbonate ions, CO(3)(2-).
              • The 2+ and 2- charges tell us that there are the same number of calcium ions and carbonate ions in calcium carbonate.


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