CHM 1301 Lecture Notes - Lecture 10: Isoprene, Terpene, Rate Equation
12 Nov 2016
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How to simplify a reaction version 1: Isolation method: set the initial concentration of one reactant substantially lower than the other reactants. Goal of the isolation experiment using terpene and ozone: The order of the reaction as it relates to ozone and terpene. Terpene describes a class of molecules, let"s use the simplest example: O3 + isoprene (cid:314) product rate = k[o3] x [isoprene] y. E know there is a 180 fold difference, so the concentration of o3 vs. isoprene will not appreciably change: 0. 000540 m 0. 00000300 m = 0. 000537 m. Difference in o3 concentration = 0. 56 % Not a big net change, therefore we can say that ozone is at a near constant concentration: E can now simplify the rate law: Now - we can test the single-concentration isoprene against 1st and 2nd order conditions: The two different rate laws for the isolated isoprene experiment: 1st order and 2nd order plot for the values in the previous table:
