Chemistry Revision
- Created by: mel
- Created on: 21-05-13 20:32
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- C1.2
- Rocks and building material
- Limestone and its uses
- Limestone is made mainly of calcium carbonate.
- The calcium carbonate in limestone breaks down when we heat it strongly to make calcium oxide and carbon dioxide.
- This reaction is called thermal decomposition.
- The calcium carbonate in limestone breaks down when we heat it strongly to make calcium oxide and carbon dioxide.
- Limestone is widely used in the building industry.
- Some types of limestone were formed from the remains of tiny animals that lived in the sea millions of years ago.
- We dig out limestone from quarries.
- Powdered limestone can also be heated with powdered clay to make cement.
- When we mix cement powder with water, sand and crushed rock, a slow chemical reaction takes place.
- This reaction produces a hard, stone like building material called concrete.
- When we mix cement powder with water, sand and crushed rock, a slow chemical reaction takes place.
- Heating limesone
- The chemical formula for calcium carbonate is CaCO(3-)
- It it made up of calcium ions, Ca(2+) and carbonate ions, CO(3)(2-).
- The 2+ and 2- charges tell us that there are the same number of calcium ions and carbonate ions in calcium carbonate.
- It it made up of calcium ions, Ca(2+) and carbonate ions, CO(3)(2-).
- The chemical formula for calcium carbonate is CaCO(3-)
- Limestone is made mainly of calcium carbonate.
- Limestone and its uses
- Rocks and building material
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