CH302 Random Musings February 18, 2009— Post V-Day special 1. Quiz 2 Results. The distribution and statistics for the quiz are found below. The average of 78% is actually very good (last year the score was a 70). One question was killed because of a flaw in the programming. 2. There is a first exam coming up next Thursday evening. I have provided the question types for it below and will hold a review next Monday night. A format and procedure for exam 1 is found at the end of the musings. But some highlights of ways in which the exam procedure may be different than last semester: • The exam will be Thursday evening from 7:30 till 9:30 pm. You get 120 minutes, sharp. • Room locations: Last name A-L will be in BUR 106. Last name M-Z will be in Welch 2.224. • You will be given a sheet of equations and constants and a periodic table. • This is a calculator-free exam. No electronic devices are to be used during the exam, and you may not be in possession of any electronic devices while the exam is in progress. • A make-up exam will be given the following Sunday evening from 6 to 8:00 pm in Welch 2.224. 3. Here are the slightly modified, and final question types for the exam. Physical Equilibria 1 temperature dependence of phase changes 2 vapor pressure theory 3 salt dissociation in water 4 phase diagram interpretation 5 phase diagram navigation 6 calculating ΔH across phases transitions 7 gas solubility in liquids 8 ranking miscibility of liquids 9 Clausius Clapeyron equation 10 Van’t Hoff factor and colligative properties 11 binary mixture and Raoult's Law 12 colligative property calculation 13 colligative property calculation Chemical Equilibria 14 setting up K from equilibrium expression 15 calculating equilibrium concentrations from K 16 calculating equilibrium concentrations from K 17 determining reaction direction from Q and K 18 LeChatelier and reaction direction 19 LeChatelier and reaction direction 20 Van't Hoff equation and T dependence of K 21 relationship of ΔG to K Introduction to Water Equilbria 22 theory of auto-protolysis of water 23. temperature dependence of Kw 24. molar solubility calculation 25. ranking solubilities based on Ksp values 26. converting between pH, pOH, [H+] and [OH-] 27. ranking acidity and basicity from Ka and Kb 28. strong acid or base calculation 29. weak acid or base calculation 30. weak acid or base calculation4. There will be two reviews for the final. • Dr. Laude will hold a review on Monday evening, February 22, 2010 from 9:00 pm to 10:00 in Welch 2.224. He will go over the 30 question types, explaining what is expected. • Travis will hold a review on Tuesday, February 23, 2010 from 9:00 pm to 10:00 pm in WCH 1.120. I don’t know what he does during this time, but I have heard he does a really good job. 5. There will be two practice exams, each of which can be done in a calculator-free manner. I will post the first practice exam in the ChemPortal late Friday evening. I will post the second practice exam on Sunday in the Answers link of my web site. 6. Worksheets. A reminder that a new worksheet was generated which includes calculator-free opportunities to work problems from the chemical and water equilbria material has been posted. Many of these worksheets can be found in your course packet, but all can be found at http://laude.cm.utexas.edu/courses/ch302/worksheetss10.html So breaking down the worksheets you should consider using: Physical Equilbria questions: • Worksheet 2 from 2009: 20 questions to help you learn the material from the first four lectures on physical equilibria • Worksheet 2 from 2008: 20 questions to help you learn the material from the first four lectures on physical equilibria Chemical Equilbria Questions: • Worksheet 3 from 2009: 10 questions on colligative properties and 10 questions to introduce you to chemical equilbria • Worksheet 3 from 2008: 20 questions to introduce you to chemical equilbria Water Equilbria Questions: • Worksheet 1 from 2010: 15 calculator free questions on Kw, Ksp, Ka and Kb to help prepare for exam 1 • Worksheet 5 from 2008: 20 questions related to simple acid base and solubility equilibrium calculations and the approximations that permit them 7. Update to the Sessions link on where to find discussion sections, office hours, reviews. I have fixed Jessica’s office hour (now 4 to 5 on Monday), Tiffany’s review session (now 6:30 to 7:30 in GAR 0.102 before her academic community), and have added a list of Travis’ review times. You can find these at http://laude.cm.utexas.edu/courses/ch302/sessionss10.pdf 8. Extra credit will be coming—I am already being queried about extra credit. CH302 is a hard course (after exam 2 you may way far more vile things about it.) To appease you , there will be three extra credits for this class, each worth 1% of your grade. Briefly they will include e-mailing me about teaching a science hater some chemistry over spring break, attending a scholarly lecture in a field that interests you, and attending an undergraduate research poster session. Much more to come. 9. Poetry Corner. First three poems that have been written about this class at the interface between Valentine’s Day and the exam on equilibrium. After that, the raw aching poetry of science and engineering students in love. Most of them make me squirm with their unabashed sentiment. But I promised so here they come.The Chemistry to Hating Valentine’s Day Anonymous I woke up Valentine’s morning, pushed open the door, To run to my computer, and check out my score. For last Wednesday, I took Dr.Laude’s test, I was sure I aced it, I did my best. But then I saw it, on my computer screen, out of 180 points, I scored less that 115! I am not too happy, so get the hell out of my way, This stupid score, ruined my Valentine’s Day! I mean, it was multiple choice, How hard could it be? I thought at the very most, I’d miss only three. But there were some questions a little too raw, like “which one is least true of the ideal gas law?” You see the word least, could be open to debate, but the tests have been graded, so it’s probably too late. So to end this poem my friends, I have to say, That because of chemistry, I truly hate VALENTINE’S DAY! A poem after failing the equilibrium exam At the start of the semester about four weeks ago, we were all learning chemistry extremely, very slow.
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