Rocks and Building Materials C1 Unit 1

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  • Rocks and Building Materials C1 Unit1
    • Limestone and its uses
      • Limestone is made mainly of calcium carbonate.
      • Limestone is used as a building material and to make calcium oxide and cement.
      • Cement mixed with sand, aggregate and water makes concrete.
      • Calcium carbonate decomposes when heated to make calcium oxide and carbon dioxide.
    • Reactions of carbonates
      • Metal carbonates decompose when heated to produce the metal oxide and carbon dioxide
      • Carbonates react with acids to produce a salt, water and carbon dioxide.
      • Carbon dioxide turns limewater cloudy,
    • The "limestone reaction cycle"
      • Thermal decomposition of calcium carbonate produces calcium oxide and carbon dioxide.
      • Calcium oxide reacts with water to produce calcium hydroxide.
      • Calcium hydroxide is an alkali that can be used to neutralise acids.
      • Calcium hydroxide reacts with calcium dioxide to produce calcium carbonate.
    • Cement and concrete
      • Cement is made by heating limestone with clay in a kiln.
      • Mortar is made by mixing cement and sand with water.
      • Concrete is made by mixing aggregate with cement, sand and water.
    • Limestone issues
      • There are good and bad points about quarrying for limestone.
      • Limestone, cement and concrete are needed as building materials.
      • Quarrying and processing limestone and its products have negative impacts on the environment.


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