L43_review1_Final_08

L43_review1_Final_08 - Material for final exam (Friday...

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Material for final exam (Friday 05/09/06, 8:00 a.m.) 1/4-1/3: new material (chapters 8,19) the rest: old material (see exams 1-4 for coverage, review keys !) Total: ~10-13 problems; same style as midterm exams Some problems may combine concepts from different chapters. I. Kinetics I. Nuclear Chemistry I. Equilibrium II. Acids, Bases, Salts II. Buffers and Solubility III. Thermodynamics IV. Electrochemistry IV. Transition metals No “Special research topics” Equations will be provided, except the fundamental ones
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Tips for Study for Final 1. Start early; you cannot cram 2. Divide material: study each I-IV separately 3. Review concepts first 4. Review lecture notes, worked examples, homework and exams 5. All problem solving should be done in writing from beginning to end ; no memorization of problems 6. Familiarize yourselves with equations; list will be too long 7. Understand all derivations; be able to manipulate equations and understand plots and graphs
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2 2 2
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Rate expressions from mechanisms: Fast Equilibrium NO + Cl 2 NOCl 2 k 1 fast R f =k 1 [NO][Cl 2 ] k -1 fast R b =k -1 [NOCl 2 ] NOCl 2 + NO 2NOCl k 2 slow R=k 2 [NOCl 2 ][NO] Overall: 2NO+Cl 2 -> 2NOCl observed: R=k[NO] 2 [Cl 2 ] From mechanisms: Rate: R=k 2 [NOCl 2 ] [NO] [NOCl 2 ] ??? If R f & R b are fast -> rxn stabilizes fast -> R f =R b [Assumption] (note that k 1 and k -1 are not the same). From equilibrium condition R f = R b k 1 [NO][Cl 2 ] =k -1 [NOCl 2 ] 1 2 1 = k k k k 1 22 1 [] [ ] [ ] k NOCl NO Cl k = 2 1 2 2 1 [ ][] [ ] k R NO C l k lk N O k C ==
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The rate for the reaction O+NO 2 -> NO + O 2 was studied under conditions of a large excess of NO 2 : [NO 2 ] 0 =1.0x10 13 molec/cm 3 . The overall rate law is given by: R = k [NO 2 ] [O] n . A plot of ln[O] as a function of time gave a straight line with -slope= 1.0x10 2 s
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This note was uploaded on 07/22/2008 for the course CHEM 115b taught by Professor Reisler during the Spring '08 term at USC.

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L43_review1_Final_08 - Material for final exam (Friday...

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