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law of mass action - (chemistry) the law that states the following principle: the rate of a chemical reaction is directly proportional to the molecular concentrations of the reacting substances. 1  law of nature, law - a generalization that describes recurring facts or events in nature; the laws of thermodynamics.
The Law of Conservation of Mass (or Matter) in a chemical reaction can be stated thus: In a chemical reaction, matter is neither created nor destroyed. It was discovered by Antoine Laurent Lavoisier (1743-94) [15K GIF] about 1785.our teacher will never require you to know the history involved, but will probably test this statement: In a chemical reaction, matter is neither created nor destroyed. It is the Law of Conservation of Mass. Antoine Laurent Lavoisier is its discoverer.