CH302 Random Musings April 20, 2006 1. Judy is out of the office for a couple of days and I know that several of you had e-mailed me about making an appointment. If you ended up playing phone tag with her, or e-mailed me in the last 15 hours or so, please come down front after class and we will try to find a time on my calendar in the next week. My times are pretty much exhausted through next Friday, except at the fringes (like early mornings) and a few in-between spots, but I will try to work something out with you. And if you haven’t e-mailed, better late than never, please consider trying to improve yourself in the class by coming to see me about the steps to take to success. 2. I am posting the 60 questions for the final exam today. The source is pretty simple. I took the 3 thirty question tests and pulled out 20 questions from each. This is very much a traditional cumulative final covering pretty much everything I have taught. And in keeping with my philosophy that I don’t care when you learn it, as long as you learn it, being able to prove to me on May 12th that you know the material well enough for an A, is good enough for me. 3. For those of you taking the final for everything, I will tell you once again, if you want to have a chance at an A, you have to get organized. And being organized means making sure your brain knows what is on the final before you start filling it with stuff that has no place to go. So memorize the question types, all 60. Do it by sections and it doesn’t hurt as much. If you don’t want to do this, don’t bother coming to me for help. 4. I have decided to toss one question from the last exam—the question on extracting Kb from the titration curve. As written, I had not taught specifically why you needn’t use Kw to solve, and so the problem was inappropriately misleading to those of you who over thought it. Otherwise, the rest of the questions on exam 2 stand. On reflection, I decided that the alpha diagram question, while perhaps somewhat foreign, did precisely what I wanted in getting students to take unfamiliar molecules and turn them into a simpler acid forms (like H2A). 5. Many of you are frantically begging after every point in e-mails and meetings with me—it is one of the down sides of teaching a freshman class filled with pre-health professions students—so I am asking you for a little perspective, and a little relief. You know I will be fair, so get a grip. As to specifics, I promise you will earn the extra credit points you turn in, so please stop panicking over this—the point totals will be posted after the last extra credit and if you see you haven’t earned them, there is time to get them in. Remember, time spent worrying about points earned on old material is time not spent learning kinetics. Not smart. 6. Happy Poetry. What follows, from the web site entitled “Happy Poetry That Rhymes.” are poems by Ogden Nash for those with short, but cheerful, attention spans. Reflection on Babies A bit of talcum Is always walcum. Cats The trouble with kittens is that they grow up to be cats. The Cow The cow is of bovine ilk; One end is moo, the other is milk. The Ant The ant has made himself illustrious Through constant industry industrious. So what? Would you be calm and placid, If you were full of formic acid?60 final exam question types 1. Definition: thermodynamic laws 2. Theory: spontaneity and stability 3. Theory: spontaneity and temperature 4. Problem: predicting ΔS for chemical reactions 5. Theory: ΔS at phase changes 6. Calculation: ΔSSurr 7. Theory: temperature and physical equilibria 8. Theory: dissolving gases, liquids, solids 9. Theory: dissolving gases, liquids, solids 10. Ranking: miscibility of liquids 11. Problem: phase diagram navigation 12. Calculation: ΔH for heating across phases 13. Calculation: vapor pressure in binary system 14. Calculation: Clausius Clapeyron 15. Ranking: Van’t Hoff and solution conc. 16. Calculation: colligative property 17. Setting up K from equilibrium expression 18. Calculation: equilibrium concentrations from K 19. Problem: Reaction direction from Q and K 20. Problem: LeChatelier and reaction direction 21. Temperature dependence of Kw 22. Ranking A/B strength from K values 23. Approximations of A/B equations 24. Simple A/B calculation (strong, weak, buffer) 25. Simple A/B calculation (strong, weak, buffer) 26. Identifying buffers (after neutralization) 27. Buffer neutralization calculation 28. Identifying features of a titration curve 29. Titration strong A/B with strong A/B 30. Titration weak A/B with strong A/B 31. Titration weak A/B with strong A/B 32. Estimating solubility from Ksp values 33. Calculating molar solubility from Ksp 34. Common ion calculation, Ksp 35. Equilibrium expressions for a polyprotic acid 36. Interpreting alpha diagrams 37. Amphiprotic polyprotic acid calculations 38. Equilibrium Calculations: polyprotic acids 39. Mass and charge balance 40. Equilibria Calculations: dilute solutions 41. relating E, ΔG and K 42. balancing redox equations 43. ranking oxidizing and reducing agents 44. stoichiometry calculation from current 45. interpreting electrochemical cell diagrams 46. cell convention: electrolysis versus voltaic 47. understanding standard reduction potentials 48. calculating cell potentials (not Nerst) 49. calculating cell potentials (Nernst) 50. famous batteries 51. assigning rate expressions 52. units of rate constants 53. method of initial rates 54. integrated rate law calculation 55. extracting kinetics info from straight line plots56. kinetic theory 57. Arrhenius calculation 58. reaction mechanisms 59. Ea and potential energy surfaces 60. famous
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