It is a colourless, odorless gas (:
and its INVISIBLE! :O
physical
Hydrogen gas is H2. Oxygen gas is O2.
Oxygen is the gas that is required for respiration.
Mass of Hydrogen gas:- 2g/mol Mass of Oxygen gas :- 32g/mol Therefore, Oxygen gas is more heavier
oxygen's physical state is gas
oxygen
Oxygen.
Oxygen
physical
Oxygen is a gas under ordinary conditions.
oxygen
It is oxygen.
Ozone is made up of oxygen atoms. It is the triatomic form of oxygen.
This really depends upon the kind of gas you are talking about. Nitrogen is a gas, and it does not react with oxygen at normal temperatures. Methane does react very readily with oxygen, although even then, you would need some kind of spark to set it off. A methane oxygen mixture does not so much burst into flames, as explode. It would burn all at once.
hydrogen
Only air (containing nitrogen, oxygen, argon, etc.).
a tiger breathe in oxygen and breathe out carbon dioxide