Question

question 5
pure substances can be classified into what groups? select all that apply.
□ elements
□ compounds
□ heterogeneous mixtures
□ homogeneous mixtures

Explanation:

Pure substances are either elements (made of one - type of atom) or compounds (made of two or more types of atoms chemically combined). Mixtures (both heterogeneous and homogeneous) are not pure substances as they are physical combinations of different substances.

Answer:

elements
compounds