Chemical reactions of the elements
Reaction of oxygen with air
Oxygen gas does not react with itself or nitrogen under normal conditions. However the effect of ultraviolet light upon oxygen gas is to form the blue gas ozone, O3, the second allotrope of oxygen. Another way to make ozone is by passing a silent electric discharge through oxygen gas. This can result in a solution containing up to 10% ozone.
Reaction of oxygen with water
Oxygen gas does not react with water. It does, however, dissolve to the extent of about x g kg-1 at 20°C (297 K) and 1 atmosphere pressure.
Reaction of oxygen with the halogens
Irradiation of a low pressure (10-20 mm Hg) mixture of oxygen, O2, and fluorine, F2, gases at low temperature (77 - 90 K) affords the gas dioxygen difluoride, O2F2.
O2(g) + F2(g) → F2O2(g)
Reaction of oxygen with acids
Oxygen gas does not react with most acids under normal conditions.
Reaction of oxygen with bases
Oxygen gas does not react with most bases under normal conditions.