Question

1. which best describes a compound? a. a pure substance made of one type of atom b. a mixture of different elements c. a pure substance made of different elements chemically combined d. a mixture of compounds

Explanation:

A compound is defined as a pure substance made up of different elements that are chemically combined. Option a describes an element. Option b describes a mixture of elements which is not a compound. Option d describes a mixture of compounds, not a single compound.

Answer:

c. A pure substance made of different elements chemically combined