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chemical change

noun
1.
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.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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