Chemistry C1.2 - Limestone & Building Materials
- Created by: h.b22
- Created on: 10-11-15 16:51
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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.
- Limestone
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