Question

a pure substance and basic unit of matter​

Answer 1

Answer:

Pure substance:-

A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. Mixtures are physical combinations of two or more elements and/or compounds. Mixtures can be classified as homogeneous or heterogeneous

Basic unit of matter:-

Atoms

AtomsThe atom is the smallest and most fundamental unit of matter. It consists of a nucleus surrounded by electrons. Atoms combine to form molecules, which are chemical structures consisting of at least two atoms held together by a chemical bond.

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Answer 2

Answer:

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