Write chemical equations for the reactions taking place when:
$(i)$ Iron reacts with steam.
$(ii)$ Magnesium $(Mg)$ reacts with dilute $HCl$.
$(iii)$ Copper is heated in air.
$(i)$ Iron reacts with steam.
$(ii)$ Magnesium $(Mg)$ reacts with dilute $HCl$.
$(iii)$ Copper is heated in air.
(N/A) $(i)$ $3Fe(s) + 4H_2O(g) \rightarrow Fe_3O_4(s) + 4H_2(g)$
$(ii)$ $Mg(s) + 2HCl(aq) \rightarrow MgCl_2(aq) + H_2(g)$
$(iii)$ $2Cu(s) + O_2(g) \xrightarrow{\Delta} 2CuO(s)$
$(ii)$ $Mg(s) + 2HCl(aq) \rightarrow MgCl_2(aq) + H_2(g)$
$(iii)$ $2Cu(s) + O_2(g) \xrightarrow{\Delta} 2CuO(s)$
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