Chemistry C1.2 - Limestone & Building Materials

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  • C1.2
    • Limestone
      • Quarry limestone due to the amount of things we can use it for
      • Limestone Can be used for building materials such as cement
      • Calcium carbonate decomposes when heated to make calcium oxide and Carbon dioxide
      • Limestone is made out of calcium carbonate
      • Cement mixed with sand, aggregate & water makes concrete
      • When limestone is heated strongly calcium carbonate decomposes to make calcium oxde and carbon dioxide. This is done on a large scale in lime kilns
        • This reaction is called thermal decomposi- tion
    • Reactions of carbonates
      • All metal carbonates react in a similar way when heated or reacted with acid
      • Metal carbonates decompose when heated to produce metal oxide and carbon dioxide
      • Carbonates react with acids to produce a salt, water & Carbon dioxide
      • Carbon dioxide turns lime water cloudy
      • Calcium hydroxide solution is called limewater
      • Limestone is damaged by acid rain because the calcium carbonate in the limestone reacts with the acid rain
    • Limestone Cycle
      • Calcium hydroxide reacts with carbon dioxide to produce calcium carbonate, the main compound in limestone
      • Calcium hydroxide is not very soluble in water. However it dissolves slightly to make limewater
      • When water is added to calcium oxide it reacts to produce calcium hydroxide.
      • Calcium hydroxide is a alkali that can be used to neutrallise acids.
      • Thermal decomposition of calcium carbonate produces calcium oxide & Carbon dioxide
    • Issues & Materials
      • To make cement limestone is mixed with clay & heated in a kiln. The product is then ground in to a fine powder
      • Cement is mixed with sand & water to make mortar. Mortar is used to hold bricks togeher
      • We depend on lmestone for building materials.
      • Quarrying limestone can have negative impacts on the environment & people living near by.


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