What two kinds of matter are pure substances?

Answer 1

Elements and compounds.

A pure substance is made up of only one entity, not a mixture of two or more, and has distinct chemical properties. Its composition is definitive and constant throughout.

Since elements are composed of only one kind of atom, they are considered pure substances, assuming they are devoid of imperfections.

Compounds are also pure substances, like water, table salt, table sugar, etc. because they are comprised of one type of compound (#"H"_2"O"#, #"NaCl"#, #"C"_6"H"_12"O"_6#, etc.)

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Answer 2

Owen Ambrose

The two kinds of matter that are pure substances are elements and compounds.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.