Which of these processes indicates that smelting copper is a chemical change? A. It involves melting copper to form liquid metal. B. It involves heating charcoal to high temperatures. C. It involves drawing copper into long wires. D. It involves breaking molecular bonds between copper compounds.
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The correct answer is option D. Smelting of copper breaks the molecular bonds between the copper compounds. This brings change in chemical properties of Copper and thus classified as a chemical change. It is not an easily reversible process and can be termed as a chemical change. Copper can also be decomposed if it is exposed to wood.
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