what is a main difference between a mixture and a pure substance?\na mixture is only a liquid, but a pure…

what is a main difference between a mixture and a pure substance?\na mixture is only a liquid, but a pure substance can be in any state.\na mixture looks the same throughout, but a pure substance does not.\na mixture can vary in composition, but a pure substance has a set composition.\na mixture can be made up of a single compound, but a pure substance cannot.

what is a main difference between a mixture and a pure substance?\na mixture is only a liquid, but a pure substance can be in any state.\na mixture looks the same throughout, but a pure substance does not.\na mixture can vary in composition, but a pure substance has a set composition.\na mixture can be made up of a single compound, but a pure substance cannot.

Answer

Brief Explanations:

A pure substance has a fixed chemical composition, like an element or a compound. A mixture is made up of two or more substances physically combined and its composition can vary. For example, air is a mixture with variable amounts of oxygen, nitrogen etc., while water ($H_2O$) is a pure substance with a set ratio of hydrogen and oxygen.

Answer:

A mixture can vary in composition, but a pure substance has a set composition.