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chemical change

Chemistry. a usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance:
The formation of rust on iron is a chemical change.
Compare physical change. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Contemporary definitions for chemical-change

any change from one state (gas, liquid, solid) which is accompanied by alteration of the chemical composition; any process in which one or more substances are changed into one or more different substances; cf. physical change

See physical change's 21st Century Lexicon
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