Fundamentals of ChemistryDOE-HDBK-1015/1-93CHEMICAL EQUATIONSRev. 0CH-01Page 45Chemical Equations SummaryLe Chatelier's principle states that if a stress is applied to an equilibrium, thesystem will adjust to minimize the effect of the stress.The following terms are defined:Density is the measure of the mass per unit volume of a material (density = mass/volume).Molarity is moles of solute per liter of solution. Molar solutions aresymbolized by the capital letter M.Normality, (N), is defined as the number of equivalents of solutedissolved in one liter of solution.ppm expresses the concentration of a solution in units of one part ofsolute to one million parts solvent. One ppm equals one milligram ofsolute per liter of solution.To balance chemical equations, the number of elemental constituents must bethe same on each side of the equation.SummaryThe important information from this chapter is summarized below.