Lec-06-Chap13-2-Complete9/15/2009Chemical KineticsRect. Mechanisms. Arrhenius Eq., etc.1Rate Laws for Chemical ReactionsChemical reactions, described by stoichiometric “overall” equations:+ACDBcdabThe overallreaction equation describes the identityand proportionsin which the reactant species are consumedand the identityand proportionsin which the product species are generated.1Lec-06: Reaction Mechanism and Rate LawsChapter 13Rate Laws- continued rate constantA1ratAB=emttntdtkadtThe rate law, frequently of the formreflects instead the detailed series of elementary reaction steps by which the chemical reaction proceeds. Consider the reaction 223222 IaqH Oaq2H OIaq4H OThe rate lawis found experimentallyto be 22IrateH Ottkt2If it was based on the overall balanced equation we would guess22223rate(t)IH OH Ok
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