A molecule is the smallest particle of a substance that exists independently. Molecules of most elements are made up of only one of atom of that element. Oxygen, along with nitrogen, hydrogen, and chlorine are made up of two atoms. A compound is a substance formed when two or more elements are chemically joined.
Subsequently, one may also ask, is o2 a homogeneous or heterogeneous mixture?
In its naturally occurring state, oxygen is both an element and a molecule, but it is not a compound. It is an atomically homogeneous substance, meaning that there aren't any other kinds of atoms in an oxygen molecule. That makes it a pure element. For completeness' sake, pure oxygen gas cannot be a mixture.
Is oxygen a pure substance or a mixture?
Pure substances cannot be separated into other substances. Some examples are carbon, iron, water, sugar, salt, nitrogen gas, and oxygen gas. A good way to decide if something is a pure substance or not is to pretend like you are holding it in your hands. Some examples of mixtures are salt in water, air, and brass.
Is gasoline homogeneous?
Pure substances can be either elements or compounds. Mixtures can be either homogeneous or heterogeneous. Another term for a homogeneous mixture is a solution. Gasoline is thus a blend of different compounds, so it is a mixture.