Question

A Compound is a ______ substance made up of ______.

• A. pure substance
• B. two or more substances

Answer 1

Properties of pure substances:

(1) A substance with a fixed chemical composition is called a pure substance, such as water, air, and nitrogen.

(2) A pure substance does not have to be of a single element or compound.

(3) A pure substance may exist in different phases. There are three principal phases solid, liquid, and gas.

(4) Pure substances have a sharply defined (one temperature) melting or boiling point. Impure substances have a temperature range over which they melt or boil.

Therefore, a compound is a pure substance made up of two or more substances.