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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.
CHANGES IN MATTER Mission Impossible! of scientists. To the Teacher: The law of conservation of mass indicates that mass cannot be created nor destroyed. means the total mass of reactants in a chemical reaction will equal the total mass of the products. mass because the students are unable to see the gas. may be used to collect the gas and preserve the mass.