- Limestone is mainly made up of the compound calcium carbonate (CaCO3), which is quarried and often used as a building material.
- When you heat calcium carbonate, it becomes Calcium oxide and releases carbon dioxide. This is thermal decomposition.
- React calcium oxide with water and you get calcium hydroxide.
- By adding more water and filtering, you get calcium hydroxide solution (limewater).
- By adding Carbon dioxide with this mixture, you get back to calcium carbobate.
- Limestone is damaged easily by acid rain caused by sulphur dioxide.
- Limestone can be heated with clay to create cement which can be mixed with sand to make mortar or sand and gravel to make concrete.
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