Waddington, Thomas C. Formerly, Department of Chemistry, University of Durham, Durham, United Kingdom.
Last reviewed:January 2020
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A substance composed of two or more elements that do not vary in composition from sample to sample, and that have fixed and definite physical properties, such as density and refractive index. The elements in compounds cannot be separated by simple physical or mechanical means, but only by chemical treatment. When compounds are formed from their elements, heat is generated or absorbed. These properties distinguish them from mixtures.
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