You might have noted that when copper powder is heated in a china dish, the surface of copper powder becomes coated with a black colour substance. (i) How has this black coloured substance formed? (ii) What is that black substance? (iii) Write the chemical equation of the reaction that takes place.
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Explanation:
1 on heating black colour substance is formed
2 cooper oxide (cuo)
3 2cu + o2 + heat ---- 2cuo
(brown) (black)
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