Medium
You could have noted that when copper powder is heated in a china dish, the surface of copper powder becomes coated with black coloured substance.
$(i)$ Why has this black coloured substance formed?
$(ii)$ What is this black substance?
$(iii)$ Write the chemical equation of the reaction that takes place.
$(i)$ Why has this black coloured substance formed?
$(ii)$ What is this black substance?
$(iii)$ Write the chemical equation of the reaction that takes place.
(N/A) $(i)$ The black coloured substance is formed because copper reacts with atmospheric oxygen upon heating to form copper $(II)$ oxide.
$(ii)$ This black substance is copper $(II)$ oxide $(CuO)$.
$(iii)$ The chemical equation for the reaction is: $2Cu(s) + O_2(g) \xrightarrow{\text{Heat}} 2CuO(s)$
$(ii)$ This black substance is copper $(II)$ oxide $(CuO)$.
$(iii)$ The chemical equation for the reaction is: $2Cu(s) + O_2(g) \xrightarrow{\text{Heat}} 2CuO(s)$
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