Chemical substances how to make?

A chemical substance may well be defined as “any material with a definite chemical composition” which is unique to itself in terms of atomic structure and reactivity. It can either be a pure chemical element or a pure chemical compound. A chemical compound is a chemical substance that is composed of a particular set of atoms or ions. Two or more elements ( pure) combined into one substance through a chemical reaction form a chemical compound (often called as substance). All compounds are substances, but not all substances are compounds.