chemical change

noun
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.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Dictionary.com's 21st Century Lexicon
Main Entry:  chemical change
Part of Speech:  n
Definition:  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
Main Entry:  chemical change
Part of Speech:  n
Definition:  See physical change
Dictionary.com's 21st Century Lexicon
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Example sentences
Glycerin-absolutely a sugar, or a substance similar to sugar-comes out of the
  tallow in this chemical change.
As the wrigglers develop, the gelatinous outer membrane decomposes, perhaps
  triggered by a chemical change in the tadpoles.
The kiln is a crucible where chemical change takes place.
My resources say that the iodine with baking powder was a physical change, and
  the iodine with cornstarch was a chemical change.
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