Why when calcium carbonate is heated it gives calcium oxide and carbon dioxide but calcium carbonate is formed by thee reaction of calcium hydroxide and carbon dioxide
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When heated above 840°C, calcium carbonate decomposes, releasing carbon dioxide gas and leaving behind calcium oxide – a white solid. ... Over time, this reacts with carbon dioxide in the air to form crystals of calcium carbonate, which lock the sand grains together to form a hard rock-like material.
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