Question

what are elements and pure substance

Answer 1

Yes, in chemistry a pure substance means either an element or a compound. Thus, hydrogen, oxygen, sodium, iron, copper etc. are pure substances; and so are compounds such as water, sugar, ammonia, sodium chloride, methane, ethanol etc. A compound is composed of two or more elements combined in a fixed ratio by mass.

Answer 2

Elements are the substances made up of only one kind of atoms or molecules.
Pure substances are the substances made up of only one kind of element.

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