nitrogen gas is BASICALLY JUST PLAIN NITROGEN AND THUS IT IS A
PURE SUBSTANCE.
Yes Nitrogen is a pure substance because pure substances are both compounds and elements. Nitrogen is an element.
Pure. (gas)
Helium gas is a pure substance
Helium gas is a pure substance
N2 (nitrogen gas) is not a mixture. It is a pure compound composed of two nitrogen atoms bonded together.
Ammonia (NH3) is a pure substance. It is a compound made up of nitrogen and hydrogen in a fixed ratio, and it cannot be separated into simpler substances by physical means.
Helium gas is a pure substance
Oxygen is an element indicating that 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.
Helium is pure as it is on the periodic table.
Yes, it is a pure substance but can be mixed with other gases.
Gas containing two or more different kinds of molecules (or elements) always form homogeneous mixtures, like air (N2, O2, CO2, etc. etc., water and other vapours, perfumes, air-polluting gases, etc.etc.). If it is composed only with ONE kind of compound or element then it is pure.