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What are the products of the thermal decomposition of calcium carbonate (CaCO3 -> ...)?

Question
What are the products of the thermal decomposition of calcium carbonate (CaCO3 -> ...)?
Calcium and oxygen
Calcium oxide and carbon dioxide
Calcium hydroxide and water
Calcium chloride and carbon
Answer
Calcium oxide and carbon dioxide
Detailed Explanation
Heating limestone decomposes it into calcium oxide (quick lime) and carbon dioxide gas: CaCO3 -> CaO + CO2.
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