2_LectureWeb - Announcement Regarding Recitations...

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Announcement Regarding Recitations Ë Recitations will begin on Monday, January 14 instead of Tuesday, January 15, as previously announced on the Schedule of Courses and in class. Ë Recitations on Monday, January 21 will not meet because of the MLK holiday. However, students in Monday recitation sections may attend any other recitation section during the week of January 21. Learning Objectives 1/10/08 You should 1. understand that integration of rate laws yields expressions for reactant concentrations as a function of time for zeroth-, first-, and second-order reactions. 2. be able to apply integrated rate law equations to determine the rate constant for a reaction from the time dependence of reactant or product concentration and to pre - dict the concentration of reactant remaining or product formed specified times using a rate constant. 3. be able to apply graphical methods to determine the reaction order and rate constant from concentration data collected as a function of time. 4. know how to find half-life( t 1 ê 2 ) expressions for zeroth, first, and second-order reactions. 5. know what the half-life( t 1 ê 2 ) for a first-order reaction represents, how t 1 ê 2 is related to the first order rate constant k , and how t 1 ê 2 can be determined graphically from a plot of reactant concentration vs. time. 2 Problem-Method of Initial Rates-Loose ends from 1/8/08 In the reduction of nitric oxide by hydrogen: 2 NO + 2 H 2 ö N 2 + 2 H 2 O three experiments were done using different initial concentrations Experiment [NO], M [H 2 ], M Observed Initial Rate, mol N 2 L - 1 s - 1 1 5.0 μ 10 - 4 5.0 μ 10 - 4 2.5 μ 10 - 5 2 5.0 μ 10 - 4 1.0 μ 10 - 3 5.0 μ 10 - 5 3 1.0 μ 10 - 3 1.0 μ 10 - 3 2.0 μ 10 - 4 General rate law equation: Rate = k @ NO D m @ H 2 D n (a) Find order with respect to NO. m = 2 (b) Find order with respect to H 2 . 5.0
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2_LectureWeb - Announcement Regarding Recitations...

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