Is a compound considered a pure substance? why or why not?

Yes.

Explanation

A compound considered a pure substance. Compounds are formed by combination of two or more than two atoms in a fixed ratio.

Reason:

Pure substances can be broken down into elements or smaller compounds. So such compounds are treated as a pure because they can be broken down into smaller compounds or elements by chemical ways.

Even though a compound can be made of two or more types of atoms, it is still a pure substance because the compound can be isolated, like salt or water.

Explanation:

If u want the sample

altitude, density, pressure

air gets less dense the higher the altitude and also the air pressure is less as altitude rises.

2b2t

explanation:

2b2t