What are substances
Chemistry
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In chemistry, a substance is a form of matter that has a definite chemical composition and distinct properties.
This means that a substance is made up of only one type of atom or molecule, and its characteristics, such as melting point, boiling point, and density, are consistent under specific conditions. For example, pure water (H₂O) is a substance, as is pure gold (Au). Mixtures, on the other hand, are combinations of different substances that do not have a fixed composition.
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