AQA Chemistry

• Limestone is usually made of calcuim carbonate
• Limestone is widely used in building 
• Limestone breaks down when we heat it strongly to make quicklime and carbon dioxide 

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• Some types were made from the remains of tiny animals and plants that lived in the sea millions of years ago
• Limestone is dug out of the ground in quarries 

• some carbonates decompose when we heat them in a Bunsen flame. 
• there is the same number of each type of atom on each side of a balanced chemical equation. 
• the mass of reactants is the same as the mass of the products in a chemical reaction.