Rocks and Building Materials C1 Unit 1
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- Created on: 10-01-15 21:16
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- Rocks and Building Materials C1 Unit1
- Limestone and its uses
- Limestone is made mainly of calcium carbonate.
- Limestone is used as a building material and to make calcium oxide and cement.
- Cement mixed with sand, aggregate and water makes concrete.
- Calcium carbonate decomposes when heated to make calcium oxide and carbon dioxide.
- Reactions of carbonates
- Metal carbonates decompose when heated to produce the metal oxide and carbon dioxide
- Carbonates react with acids to produce a salt, water and carbon dioxide.
- Carbon dioxide turns limewater cloudy,
- The "limestone reaction cycle"
- Thermal decomposition of calcium carbonate produces calcium oxide and carbon dioxide.
- Calcium oxide reacts with water to produce calcium hydroxide.
- Calcium hydroxide is an alkali that can be used to neutralise acids.
- Calcium hydroxide reacts with calcium dioxide to produce calcium carbonate.
- Cement and concrete
- Cement is made by heating limestone with clay in a kiln.
- Mortar is made by mixing cement and sand with water.
- Concrete is made by mixing aggregate with cement, sand and water.
- Limestone issues
- There are good and bad points about quarrying for limestone.
- Limestone, cement and concrete are needed as building materials.
- Quarrying and processing limestone and its products have negative impacts on the environment.
- Limestone and its uses
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