Chem1330ClassNotesfor 30August2017.pdf

Chem1330ClassNotesfor 30August2017.pdf - Chapter 13...

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Unformatted text preview: Chapter 13: Chemical Kinetics Léwc 40m; ; Cir/mm] rajmifl m 14M Already know: (1) Stoichiometry @me mam/3 5 £14146) i @969"? Z; 550/3 (2) Energetics 2 N02 9 N2 + 2 02 Energy considerations: WW: ; c, \ klngc wit/lgg/ “\_ " MA E& 25:" MT 1% RV \ - ram/N? \ 1m,fivfi‘(\ T0 4 2 N02 _. ia WWt , . “g r , , Mm 1,3,71sz reaction coordinate ——> 0 My? at {WW [Mi/W159 Kinetics: How fast and HowJr W mi? 4‘ ggwfimm 0+ 0L “rm - Consider NH4NO3 9%. N2 +NO + 2 H2 0 Nikki fl 3‘~‘ 5%" ML ver lar e ener release L>y(i€’/ %26d |/\ (SOB/aw (4171‘? Weiemfl E105 ion/W ,20 425” (6r: 0&0) paltry but very slow reaction 10 ( i L; can 90+ )2? arr/B an $1M «v thus: High activation energy barrier k5 Ear M33 W0 Analogy Driving l-7O to St. Louis COU StL t: 9:00 ouv\ t=/l100am x: [9‘5 W; x: 0150 milk) 0 i 0 A1 19) law/Me; \ {35% Average driving rate— — E ' W 7/ w : 4,52.me“ Silflil “3an 3% 3““ My if“ H ) )i. ilk (I\. ?( mp“ i 4-“: ”Li" W WdKW @Q,me>l/\ wmiflnfl AE: [Six ~’> par/mg 90mph At: igékr—BPMJ &?MPA 6% “i” 0* {Mi/W We“ SKWV W4 Now a chemical reaction 2 N205(9) 94 N02(9) + 02(9) (:1\ht(r- fwd \. £216 hang. gm. JP; (3 W x, 1. 2 1 —o 0.8 - . 0.6 — - 0.4 4 0.2 - 0 | I | .l I —'T 0 100 200 " 300 400 500 600 [N205] (M) time (8) Average rate of change of [N205] {2039C EN 0:] :IHA A10: 600% D005]; OM " (g M QW— Aclflfimog] «(O'iBM ,. , “Egg 0) 38c ' g m At M [966/ MW“ 3/4 “(WM)“ ..... » 14% ~ + O (file—1’ , 7m ,_ _ _...._k_-_h-.._..._._......._ _.......____._.-_._.___.-.__ ___*— :35 (wk ei ”VXA (ggmigiwwfa Near beginning of reaction {fir Gem Lime ‘1 M Near end of reaction 7%, : WAC“ SW” LN 1533;11:— (‘3 . 0‘5 [fl J: ) Q C} ff? gag [3V afifj 2, ‘7 U 983 'f [/L y_,, ; '\ ‘ fa W3 WW glam K “WM!” jféd @‘i “MA “Instantaneous” rate = rate at a given point 9take tangent to curve at point to determine “instantaneous” rate Rate of Reaction 2 N205(9)94 N02(g) + 02(9) 1 2 1/2 Ratez— =+— At 2 At @nvfmh’m/I 5 EMM M fiadWé-v' ”mm W WWW) 3 A[N205] 1 A[N02] =+2 M02] At Can we get more information? J I» < (9) ._.__. ‘J /\ (1J3 +- J (J) Trial [N205] Initial Rate 0.200 M 0.00136 Ms-1 0.400 M 0.00270 Ms-1 0.600 M 0.00412 MS'1 0.800 M 0.00545 MS'1 1.00 M 0.00682 MS'1 COnémr-nws OZ 4 4; . 7 AS [NLOS'] aim/bad) W71 Aappé/JJS 790 W. :5 LJJi Rate Law = we : Jimmy] .i' , ’ Aft,“ f axiiu ‘,JJJ-J. Terminology: Reaction Order Example1: {ELM EXXCNyll/Lsfl ZL>L§+ (MW ::> ow] 0L LMUJ‘ 5:72 L K’LLLLWMM 6W ‘3? {LerrH/Lg/ MM BJLML ”ch {bye/Lind 4’ka o2 0%le (NW/at LNH “(g 5L :4 ENC)? j 75% i5+ ”LL/{Hf UK [Mallgi] (PLO! 18% (w 4/ (W CAKE 3 In general: LL L m J [w [3 (”LL r :; ‘n L mm Example 2: Most common orders: LEV ML {9M CW/CLLZL” "MW "26%;: cfv/ZML/ V“ W 72% J‘LZLW ...
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