Answer:

1. Pure substances

Pure substances are substances that are made up of only one kind of particles.

Pure substance has a fixed or constant structure.

Pure substances are further classified as elements and compounds.

2.Mixture

a substance made by mixing other substances together.

a combination of different qualities, things, or emotions in which the component elements are individually distinct.

It can be separted through physical means.

3.Elements

simplest form of pure substance.

cannot be separated through physical and chemical means

made up of atoms.

4.Compounds

is the union of two or more elements.

can be separated through chemical means.

also a pure substance.