why does the surface of copper turnings become black on heating in air?
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When Copper is burned in the presence of oxygen a black colored substance is formed over the copper surface. This black colored substance is formed as a result of Copper reacting with atmospheric Oxygen while being heated up. This results in the formation of black colored coating.
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Beacuse it reacts with O2 to form CuO
2Cu + O2 ----> 2CuO
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