Describe pure substances.
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A substance that has a fixed chemical composition throughout is called a pure substance
such as water, air, and nitrogen.
A pure substance does not have to be of a single element or compound. A mixture of two
or more phases of a pure substance is still a pure substance as long as the chemical
composition of all phases is the same
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Pure substances - Many substances around us contain only one time of constituent particles. Elements and compounds are pure substances. Some of the pure substances are iron, copper, water, salt etc.
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