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Why copper does not burn but the hot metal is coated with a black coloured layer of copper oxide |
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Answer» Copper metal when exposed to hearing in air, oxygen reacts with copper surface forming thin layer of copper oxide over it. ... This layer being coated on pure copper, protects it from oxygen. Therefore, whole copper doesn\'t burn, instead black coat of copper oxide is formed over it. At normal temperature, the surface of copper is covered with copper oxide. The thin layer of copper oxide is a protective cover which protects copper from further oxidation. Thus this copper oxide does not burn as it is already reacted with the oxygen in the air. No further oxidation can occur. This is because copper is active when hot. So when heated Cu is exposed to the atmosphere, it combines with atmospheric O2 , forming CuO which is black in colour |
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