Question

What two kinds of matter are pure substances?

Answer 1

We must know that the pure substance is nothing but matter formed by the same kind of atoms or molecules. Once pure substance is composed of similar moiety. Pure substance is classified as an element and compound. Pure compound classification is based on formation of substances.

Complete answer:
Pure substance is free flow w of solid. Liquid also forms a pure substance. In a mixture classified as heterogeneous and homogeneous mixture. Homogeneous mixture means mixed with two or more compounds to form a single form of solid or liquid. Heterogeneous mixture means mixed with two or with two or more compounds to form a single form of solid or liquid. More compounds form more than a single form of solid or liquid.
We need to know that the compound means a molecule is made up of two or more atoms with different atoms by forming bonds to form stable bonds. In this formation various kinds of bonds are used to form compounds by atoms. There three kinds of bonds are forming in the compound are -Ionic bond -Covalent bond -Coordinate bond Ionic bonds are formed between cation and anion. The compound formed by ionic bonds is known as ionic compound.
The smallest unit of matter which is atom is one of the pure substance as there can’t be any impurity which can be added to it, the second pure substance is molecule when two or more than two atoms combine together it form molecule and there is nothing which we can add to make it impure.
So our answer in short form is that atoms and molecules are the two kinds of matter which are pure.

Note:
We have to remember that copper metal is an example for elements and copper sulphate is an example for compounds. Compounds are more stable than mixtures. In compounds, ionic compounds are more stable than other compounds. Ionic bonds are stronger than covalent and coordinate bonds.