Lec 12 Mechanisms and Thermo I

Lec 12 Mechanisms and Thermo I - Not necessarily 2nd order...

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Unformatted text preview: Not necessarily 2nd order Obj228 Obj229 307 t 307 m1 307 m2 307 b and 308 t 308 m 308 b 309 t Mechanisms 309 m 309 b 310 t 310 m 310 b and 311 t 310 t 311 m 311 b Catalysts = speed up chemical reactions by increasing the number of steps in the mechanism. The slow step is divided into two or more steps, each of which has a lower Energy of Activation (Ea). 312 t 312 b 312 b a. NaBr(s) is added to a solution of H2O2(aq). b. Br2 is visible during the reaction. c. The Br2 color disappears as Br – (the catalyst) is regenerated --- 313 258 313 314 314 314 314 314 314 314 Because both G and Keq tell which way a reaction shifts, it would be expected that there would be a mathematical relationship between them. 45 b 314 314 314 315 t 315 b 315 b 315 b 315 b 315 b 315 b 316 t 316 t 316 b 316 b 316 b 316 b 316 b 316 b “Room temperature” = 25oC 317 t “Room temperature” = 25oC 317 t “Room temperature” = 25oC 317 t 317 b 19 20 317 b 317 b 317 b 318 t 318 t 318 t 318 t 318 t 318 b 318 b 319 t 319 t 319 b 319 b Obj292 320 t Obj297 320 t Obj302 320 t Obj306 320 t 19 Obj309 320 t 320 b 19 20 320 b 321 t 321 t 321 t 321 t 321 t 321 b 321 b 321 b 321 b 19 20 These values were calculated earlier (p. 318) and (p. 321). 322 322 322 322 322 323 t 323 t How do you calculate G at higher temperatures? 322 323 b 323 b 323 b 323 b 324 t 324 t 324 b 325 t 325 b 325 b 325 b 325 b 325 b 326 t 326 t 326 t 326 b 326 b 326 b 326 b 327 327 327 327 324 t Temperature where spontaneity changes ...
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Lec 12 Mechanisms and Thermo I - Not necessarily 2nd order...

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