what are impure substances? why are they called impure?
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A pure elements or compound contains only one substance with no other substance mixed in. Impure materials may be mixtures of compound, or mixture of elements and compound
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An impure substance is a type of mixture, so melting points can be used to find out if a substance is pure or impure. Impure substances tend to have a slightly lower melting point than the pure substance, and a broader melting temperature range.
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