Which type of substance is made of only one kind of matter and has definite properties?

A. A molecular substance

B. An atomic substance

C. A pure substance

D. A chemical substance

a pure substance

Explanation:

A pure substance is made up of only one kind of matter and has definite properties. A pure substance has matter having an invariant chemical composition and distinct properties. A pure substance can be an element or a compound.

An element is a fundamental substance that cannot be separated into smaller substances by chemical method. A compound is a substance composed of two or more elements in fixed proportions and can be separated into smaller substances or elements by chemical methods only.