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If copper metal is heated over a flame, ...

If copper metal is heated over a flame, it develops a coating. What is the colour and composition of this coating ?

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When copper metal is heated over a flame, it develops a coating which is of black colour and it is of copper (II) oxide or `(CuO)`.
`2Cu + O_2 to 2CuO`

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DINESH PUBLICATION-METALS AND NON-METALS-Very Short Answer Questions
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  16. Why does not stainless steel get rusted easily ?

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  18. Give chemical names of the two salts belonging to sodium family.

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  19. Name any one alloy made from (i) a metal and a non-metal (ii) two meta...

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  20. Why do we apply paint on iron articles?

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