Transcription of Chemical Kinetics Reaction Rates - csus.edu
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Chemical Kinetics Reaction Rates - csus.edu
1 Reaction Rates : Reaction Rate:The change in the concentration of a reactant or a product with time (M/s).Reactant Products A B()change in number of moles of BAverage ratechange in timemoles of Bt= = [A]Rate t= [B] t=Since reactants go away with time: Chemical Kinetics2 Consider the decomposition of N2O5to give NO2and O2: 2N2O5(g) 4NO2(g) + O2(g)reactants decrease with timeproducts increase with time32N2O5(g) 4NO2(g) + O2(g)From the graph looking at t = 300 to 400 O =9 10 Ms100s = NO = 10 Ms100s = N O = 10 Ms100s = Why do they differ?
5 The Overall Order of a reaction is the sum of the individual orders: Rate (Ms−1) = k[A][B]1/2[C]2 Overall order: 1 + ½ + 2 = 3.5 = 7/2 or seven−halves order note: when the order of a reaction is 1 (first order) no exponent is written. Units for the rate constant: The units of a rate constant will change depending upon the overall
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