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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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Examples from the web for chemical change
  • 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.
  • One substance that remains as a result of the chemical change is ash.
  • The elements making up a compound cannot be recovered without a chemical change.
  • It may be some sort of energy of motion, kinetic energy, or it may apply to some other form of energy or chemical change.
  • Tending toward decomposition or other unwanted chemical change during normal handling or storage.
  • Hydrothermal metamorphism is a chemical change that occurs when hot fluids circulate through out the rock.
  • The third category of chemical products is devices that effect chemical change.
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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