no it can't be because of the polutin and many human activities.
If the atmosphere had always been pure oxygen, life as we know it would never have developed. If the atmosphere suddenly became pure oxygen, wild fires would rage throughout the world, and most plants and animals would die in a short time.
Without nitrogen in the atmosphere, we would be breathing in nearly pure oxygen, which would be fatal.
no because Uranus' atmosphere is supposed to be pure gas.
By reacting Gallium in an atmosphere of pure Nitrogen
Because it's mostly made of pure oxygen.
Helium found in atmosphere will have other gases as impurities. But it can be isolated by suitable method (generally by adsorption of gases) to get pure helium.
When water evaporates, it is generally quite pure, but while suspended in the atmosphere, it is exposed to dust particles that become part of the condensate, so the resulting water is not pure, but contaminated with the solid particles that are in the atmosphere in the same vicinity.
Pure carbon combusts in an oxygen atmosphere to produce carbon dioxide and heat. C + O2 --> CO2
Not that you would notice. The moon lost it's atmosphere long ago- not enough gravity. Conditions on the surface are pretty much pure vacuum.
welding supply store
An atmosphere implies the presence of a gaseous substance (such as air, in the earth's atmosphere, which is primarily made up of nitrogen and oxygen). Space is defined as the absence of atmosphere (as pure space consists of no solid, liquid or gaseous substance).
The average pH of pure unpolluted rain is around 5.6. This acidity is due to the dissolved carbon dioxide in the atmosphere forming carbonic acid.