Question

examples of pure substances are *

• elements and mixtures
• elements and compounds
• compounds and mixtures
• compounds and solutions

Explanation:

A pure substance has a definite and constant composition. Elements are pure substances made of only one - type of atom, and compounds are pure substances made of two or more types of atoms chemically combined in a fixed ratio. Mixtures and solutions are not pure substances as they are composed of two or more substances physically mixed.

Answer:

B. elements and compounds