Copper does not react with water, but it does slowly react with atmospheric oxygen to form a layer of brown-black copper oxide which, unlike the rust that forms on iron in moist air, protects the underlying metal from further corrosion (passivation).

What happens when copper and water reacts?

When copper reacts with oxygen in presence of water and forms copper hydroxide. So, basically when copper reacts in presence of water, carbon dioxide and oxygen, the copper metal undergoes oxidation and reduction simultaneously and forms copper hydroxide and copper carbonate. ... It is also known as redox reaction.

Why is copper not reactive in water?

Copper does not react with water or steam because it is very low on the reactivity scale.