Question

what are the 2 types of pure substances? check all that apply
compounds homogeneous mixtures heterogeneous mixtures elements

Explanation:

A pure substance has a definite and constant composition. Elements are made of only one type of atom. Compounds are made of two or more types of atoms chemically combined. Mixtures (both homogeneous and heterogeneous) are not pure substances as they have variable compositions.

Answer:

compounds, elements