When copper is heated in air, it reacts with oxygen to form copper(II) oxide.
2Cu+O2→2CuO 2\text{Cu} + \text{O}_2 \rightarrow 2\text{CuO} 2Cu+O2→2CuOWhat happens to copper in this reaction?
Copper is decomposed.
Copper is neutralised.
Copper is oxidised.
Copper is reduced.