CH302 Random Musings February 17, 2011— Post V-Day special 1. Quiz 2 Results. Though I wanted an 83, the 75 was actually very good— looking at the distribution, more than half of you missed 1 or fewer. That is good. By the way, last year’s group benefited from a killed question that boosted their average and they had an easier quiz. So I am willing to view the two classes as neck and neck in the “smartest class ever” race—exam 1 will tell the tale. 2. THEORY QUESTIONS—THE BANE OF YOUR EXISTENCE. One reason the quiz 2 average wasn’t an 83 is that I intentionally made the van’t Hoff problem one where you had to do theory (in other words, you had to read a lot of words.) I did this because you can be guaranteed that the hardest questions on the first exam will be the “theory” questions and there will be a lot of them. Which means you need to start putting the effort into understanding them. To do so, you have to own the vocabulary of this course and be able to construct a series of logical sentences, in sequence, that you can say out loud as proof you know the theory. If you can’t, you don’t know the theory, and you will miss the questions on the exam. I have highlighted in red, below, the questions for which a conversational knowledge of the material is essential to success on the exam. Sof or every question in red, be able to look at a study buddy, and talk their ear off without say words like “thingy or stuff.” 3. 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 include: • 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 Welch 2.224. Last name M-V will be in W. C. Hogg 1.120 and W – Z will be in Welch 2.256. • 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 2.224.4. Here are the exam question types—they were posted two weeks ago. 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 from heating across phases transitions 7 gas solubility in liquids 8 ranking miscibility of liquids 8 calculating vapor pressure in binary system 10 Clausius Clapeyron equation theory 11 colligative property application 12 colligative property calculation 13 colligative property theory 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 van’t Hoff equation calculation (NOT the van’t Hoff factor) 20 relationship of ΔGo to K Introduction to Water Equilbria 21 theory of auto-protolysis of water 22. temperature dependence of Kw 23. converting between pH, pOH, [H+] and [OH-] 24. simple solubility calculation 25. ranking salt solubility using Ksp estimations 26. ranking acid base strength based on K values 27. strong acid or base calculation 28. weak acid or base calculation 29 weak acid or base calculation 30. simple buffer calculation 5. 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. 6. There will be two practice exams, each of which should 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 Assignment link of the Portal. 6. Worksheets. A reminder that all the worksheets that you need in preparation for the exam have been posted at http://laude.cm.utexas.edu/courses/ch302/worksheets302.html So breaking down the worksheets you should consider using: Physical Equilbria questions: • Worksheet 1: 20 questions to help you learn the material from the first four lectures on physical equilibria • Worksheet 2: 10 questions on Colligative Properties to help with Quiz 1 Chemical Equilbria Questions: • Worksheet 3: 10 questions to get your starting on Chemical Equilbria and the Law of Mass Action Water Equilbria Questions: • Worksheet 4: Identifying Acids and Bases by Calculation Type--do it, it is good for you (this isn't essential for this exam but if you can start learning this way, you will survive exam 2.) • Worksheet 5: 15 questions to get your starting solving simple (non-neutralization) acid base and solubility calculations. (this is a really good worksheet for exam 1.) • Worksheet 6: 20 questions more simple solubility and acid base calculations with an introduction to how approximations work (lots of really good questions—you don’t need to be able to understand the approximation problems, though. But again, though not on the exam this time, I will have taught the material and it is good to learn.)7. I know it starts to sound pretty hollow, but the engagement in learning has to pick up soon with better attendance at discussion sessions and academic communities. Yesterday I had my lowest attendance at a discussion session not held the day after a test, IN HISTORY. It should be appreciated that the following is true about CH302: • It is much harder to earn an A overall • Exam 2 is close to impossible to earn an A on because of the material and the timing (it is right after spring break). • This means that you need to get ahead of the curve by doing well on exam 1, an exam that is just one week from now and for which the vast majority of you no little to nothing about acid-base equilibria. 8. Extra credit will be coming—I am already being queried about extra credit.
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