Pure. (Its nitrous oxide.)
It is a chemical compound.
Helium is pure as it is on the periodic table.
Pure. (gas)
Helium gas is a pure substance
Helium gas is a pure substance
It is a pure substance. It is a basic gas
Helium gas is a pure substance
It is an element so pure substance...Roll Tide
Oxygen is an element indicating that is a pure substance.
nitrogen gas is BASICALLY JUST PLAIN NITROGEN AND THUS IT IS A PURE SUBSTANCE.
It depends. You can have a gaseous mixture such as air, which would be a homogeneous mixture. But a single gas such as oxygen or methane would be a pure substance.
Yes, it is a pure substance but can be mixed with other gases.
No. Argon gas is a pure substance. It is a noble gas element