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C1.2 Limestone and Building Materials AQA Chemistry GCSE
Jennifer Mitchellon 17 April 2014
Transcript of C1.2 Limestone and Building Materials AQA Chemistry GCSE
What is Limestone?
Limestone is an ore of calcium carbonate.
An ore is a
of many substances, including one which is valuable.
The valuable mineral in limestone is the
Reactions of Carbonates
The test for carbon dioxide is bubbling it through limewater.
Describe (Grade C/D):
the limewater turns milky/cloudy.
Explain (Grade A/B):
an insoluble white precipitate of calcium carbonate is formed.
Ca(OH)2 + CO2 --> CaCO3 + H2O
Cement and Concrete
- Calcium hydroxide in mortar reacts with carbon dioxide in the air to form calcium carbonate. Therefore mortar is used to stick bricks together as it gets harder in dry air over time.
- Heating limestone with clay in a kiln forms cement. Mixing cement with sand and water makes an excellent material for buildings.
- Small stones or crushed rocks are known as aggregate. Combining cement, sand, water and aggregate forms concrete. Reinforcing it with steel bars is excellent for making the foundations of buildings.
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Limestone (containing calcium carbonate) is heated. It thermally decomposes to form calcium oxide "lime" and carbon dioxide. The kiln is rotated so that the limestone is consistently heated and reacts completely.
When some metal carbonates are heated they decompose thermally. They produce a metal oxide and carbon dioxide.
MgCO3 --> MgO + CO2
Metal carbonates also react with acids to form a salt of the metal, carbon dioxide and water.
CaCO3 + 2HCl --> CaCl2 + H2O + CO2