ch14houts(1) - Order 0th 1st 2nd rate law r=k r = k[A r =...

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Order 0 th 1 st 2 nd rate law r = k r = k[A] r = k[A] 2 units for k ex.: integrated rate expression or or plot as y [ A ] ln [ A ] plot as x t t t slope ! k (neg. slope) ! k (neg. slope) k (pos. slope) y-intercept [ A ] 0 ln[ A ] 0 t 1/2 [] A k 0 2 conc time M sec Ms 1 1 time 1 min min 1 1 conc time 1 e c −− 11 Ak t A t =− + 0 ln[ ] ln[ ] t A t + 0 ln A A kt t 0 [] [] AA e t kt = 0 0 A kt A t =+ 1 A 1 0 A 0 693 . k 1 0 kA
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Chemistry 122/125 — Experiment 17 Lab Report Tips 1. When graphing you can use a computer to do the graphs. If your graphing program does regression analysis or “trend lines” (least squares fitting) you can use this to plot your lines as well. Some programs can also draw nice smooth nonlinear curves. If you use the trend line produced by the computer you need to include, both on the graph and in your report, the equation the computer gives you for the line. You should also report the correlation coefficient (usually signified as R or R 2 ) which gives you some idea how good the fit is. The closer R is to ±1 (R 2 = 1) the better your fit is to a trend line, i.e. the closer your points are to falling on trendline (R=±l means all your points should fall exactly on the chosen trend line). Some programs report a X 2 or variance of the fit, s t 2 which tell you how good the fit is. Report these if given. If your program can not do a regression analysis (trend line) than just have it plot the points and you draw the “best-fit” curve. This means you have to compute the slope yourself (if using a linear fit). To do this accurately and correctly you need to have the plotting program draw grid lines so it looks something like the graph paper provided in your lab manual. Having a few tick marks at 0.5 inch intervals will not be acceptable. For all graphs, whether by hand or computer generated, they should occupy essentially the whole page. In other words, spread out your axes so your data occupies as much of the graph and page as possible.
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This note was uploaded on 02/19/2012 for the course CHEM 125 taught by Professor Zellmer during the Winter '08 term at Ohio State.

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ch14houts(1) - Order 0th 1st 2nd rate law r=k r = k[A r =...

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