Question

A pure substance can only be

Answer 1

a pure substance has definite in constant composition like salt or sugar a pure substance can be either an element or a compound by the composition of a pure substance doesn't vary

Answer 2

Answer:

elements and compounds

Explanation:

pure substance means a substance which is made up of only one kind of particle or only same type of compound.

Hence element contains only 1 type of atoms

and compound

Example:

H2 is made of only hydrogen atoms

hence it is element

H2O is made of 2 hydrogen atoms and 1 oxygen atom