Rocks and Building Materials

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LIMESTONE AND ITS USES

We quarry large amounts of limestone rock.  We use blocks of it to make buildings.  Limestone is also used to make calcium oxide and cement.  It is mainly composed of calcium carbonate (CaCO3).  When heated strongly, the calcium carbonate decomposes to form calcium oxide and carbon dioxide.  In industry this reaction is carried out in large lime kilns.

Thermal decomposition of calcium carbonate:

CaCO3 ---> CaO + CO2

REACTIONS OF CARBONATES

All metal carbonates react in similar

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