limestone & building materials

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  • Limestone & building materials
    • limestone, mainly composed of the compound calcium carbonate, is quarried & can b used as a building material
    • calcium carbonate can b decomposed by heating (thermal decomposition) to make calcium oxide & carbon dioxide
    • the carbonates of magnesium, copper, zinc, calcium & sodium decompose on heating in a similar way
    • calcium oxide reacts with water to prouduce calcium hydroxide, which is an alkali that can b used in the neutralisation of acids
    • a solution of  calcium hydroxide in water (limewater) reacts w carbon dioxide to produce calcium carbonate
      • limewater is used as a test for carbon dioxide. carbon dioxide turns limewater cloudy
    • carbonates react w acids to produce carbon dioxide, a salt & water
      • limestone is damaged by acid rain
    • limestone is heated w clay to make cement
      • cement is mixed w sand to make mortar & w sand & aggregate to make concrete


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