Which statement about pure substances and compounds is correct?

Question

a. All pure substances are compounds.

b. Pure substances cannot be compounds.

c. All compounds are pure substances.

d. Compounds cannot be pure substances.

choose the correct answer

Answer 1

The correct answer is:

c. All compounds are pure substances.

This is because compounds are made up of two or more elements that are chemically bonded together, and because they have a uniform composition throughout, they qualify as pure substances. However, not all pure substances are compounds, as some elements are also considered pure substances.