Answer :
Final answer:
A pure substance consists of only one kind of matter, either an element or a compound, maintaining a consistent composition and properties throughout.
Explanation:
A pure substance contains only one kind of matter, which can be either an element (composed of one type of atom) or a compound (composed of two or more types of atoms).
If a substance is chemically pure, it cannot be separated into different components but always maintains the same composition and properties throughout.
For example, aluminum oxide is a chemically pure compound, while mixtures like orange juice are not chemically pure as they consist of different substances.
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