From Longman Dictionary of Contemporary Englishchemical reactionˌchemical reˈaction noun [countable, uncountable] HCa natural process in which the atoms of chemicals mix and arrange themselves differently to form new substances the chemical reaction between ozone and chlorine
Examples from the Corpus
chemical reaction• It's all a chemical reaction.• Fuel cells, which provide electricity generated by a chemical reaction between hydrogen and oxygen, constitute one part of that research.• Enzymes increase the rate of a specific chemical reaction by lowering the activation energy needed for the reaction to proceed. 