When metals react with oxygen, metal oxides are formed. The speed of the reaction depends on the reactivity of the metal.
Watch this video for a practical demonstration of reacting metals with oyxgen.
This is the general word equation for the reaction:
metal + oxygen → metal oxide
For example, the reaction of zinc and oxygen can be written as:
zinc + oxygen → zinc oxide
2 Zn(s) + O2(g) → 2 ZnO(s)
The reactions of metals with water, acid and oxygen depend on their position in the reactivity series. This can be summed up in the diagram below.