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C1 Rocks and Building Materials
A solid (solute) dissolved in water (solvent)
When a compound breaks down into simpler molecules or elements
Limestone is mainly composed of the compound calcium carbonate.
- Quarrying uses explosives to break limestone into pieces. It produces dust which may cause breathing difficulties such as asthma
- It creates noise pollution
- It may create more traffic to and from the quarry
- Destroys the landscape and may impact wildlife
- Creates local jobs
- Provides building materials: a valuable raw material for cement
Calcium oxide (quicklime) is produced industrially using a lime kiln, by adding heat (thermal decomposition).
Calcium carbonate —> calcium oxide + carbon dioxide
Carbonates of copper, zinc, calcium and sodium all decompose on heating in a similar way.
Reactions of carbonates
Test for Carbon Dioxide
Bubbling carbon dioxide through aqueous calcium hydroxide (lime water) makes the limewater turn milky/ cloudy. This is because this reaction makes calcium carbonate and water.
Limestone is heated with clay to make cement.
Cement is mixed with sand to make mortar, and with sand and aggregate (crushed rock) to make concrete.
Page last updated: 14/04/2017