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Definition of Chemical change

Chemical change Definition from Science & Technology Dictionaries & Glossaries
General Chemistry Glossary
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Compare with physical change. A chemical change is a dissociation, recombination, or rearrangement of atoms.
Chemical change Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
Chemical changes occur when a substance combines with another to form a new substance, called synthesis or, alternatively, decomposes into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. Some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. Understanding chemical changes is a major part of the science of chemistry.

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Chemical change Definition from Language, Idioms & Slang Dictionaries & Glossaries
WordNet 2.0

Noun
1. (chemistry) any process determined by the atomic and molecular composition and structure of the substances involved
(synonym) chemical process, chemical action
(hypernym) natural process, natural action, action, activity
(hyponym) acylation
(classification) chemistry, chemical science