Identify the substances that are oxidised and the substances that are reduced in the following reactions.
$(i)$ $4 Na ( s )+ O _{2}( g ) \rightarrow 2 Na _{2} O ( s )$
$(ii)$ $CuO ( s )+ H _{2}( g ) \rightarrow Cu ( s )+ H _{2} O ( l )$
Identify the substances that are oxidised and the substances that are reduced in the following reactions.
$(i)$ $4 Na ( s )+ O _{2}( g ) \rightarrow 2 Na _{2} O ( s )$
$(ii)$ $CuO ( s )+ H _{2}( g ) \rightarrow Cu ( s )+ H _{2} O ( l )$
$(i)$ Sodium $(Na)$ is oxidised as it gains oxygen and oxygen gets reduced.
$(ii)$ Copper oxide $(CuO)$ is reduced to copper $(Cu)$ while hydrogen $(H_2)$ gets oxidised to water $(H_2O)$.
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