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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 is that, in a closed system, matter cannot be created or destroyed. It can change forms but is conserved. Law of Conservation of Mass in Chemistry. The Law of Conservation of Mass is a relation stating that in a chemical reaction, the mass of the products equals the mass of the reactants. Antoine Lavoisier stated, atoms of an object cannot be created or destroyed, but can be moved around and be changed into different particles.