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.
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
noun 1. addiction to drugs or alcohol. chemical dependency n. A physical and psychological habituation to a mood- or mind-altering drug, such as alcohol or cocaine.
- Chemical diabetes
chemical diabetes n. See latent diabetes.
- Chemical dermatitis
chemical dermatitis n. Contact dermatitis due to exposure of the skin to a chemical, usually characterized by erythema, edema, and vesiculation of the exposed or contacted site.
- Chemical energy
chemical energy n. Energy liberated by a chemical reaction or absorbed in the formation of a chemical compound.