| Announcements Archive |
Jun 22, 2005 | Final exams can be picked up from Young Hall 3104 from 1-3 pm each afternoon, bring ID. I will be in the UK for the next two weeks, so don't expect a quick reply if you e-mail me to complain about your grade... | ||
Jun 17, 2005 | I will hand in my grades today - they should be posted on URSA soon (I don't use the MyUCLA gradebook), finals with stamps will be mailed Monday - and the rest of you should check this website from time to time to see where you can pick up your final exam. Have a great summer and good luck in Chem 30B and beyond - Stuart | ||
Jun 17, 2005 |
GRADING BREAKDOWN | ||
Jun 16, 2005 | The final is graded (although grades HAVE NOT been assigned yet)... the average (mean) was 101/200, high score was an amazing 221/200 and the low was 8/200... Well done - many people improved by 10% and more, and an average of 51% on my final is one of my highest. Have a great summer! I will post a note soon, saying where finals can be picked up from. | ||
Jun 16, 2005 | Key to the final is posted - grading is underway | ||
Jun 14, 2005 | Some answers to the synthesis problems are posted below... | ||
Jun 12, 2005 | Better late than never, some synthesis problems are posted below... | ||
Jun 12, 2005 | CHEM 30A FINAL IS ON THURS JUN 16 FROM 8:00-11:00 AM... Make sure you go to the correct room for the FINAL: room assignments are based on the first letter of your last name: A-J, N-Z in CS50, K-M in Haines A2 | ||
Jun 12, 2005 |
DOs and DON'Ts for the FINAL: | ||
Jun 10, 2005 | Last set of lecture notes are posted... some short synthesis problems will be posted tomorrow, and I will go through them in the review next week... | ||
Jun 08, 2005 | I will run a second review session on Wednesday 15th June in CS50 from 6:30 pm, bring questions, I will not prepare anything... | ||
Jun 08, 2005 | Quiz 3 is graded - mean was 87% (26/30) and the key is posted... | ||
Jun 06, 2005 | Lecture 24 Assignments: Reading Ch 7 (3rd Ed); Ch 8 (4th Ed) Problems 7.3-7.27 (3rd Ed); 8.2-8.4, 8.9-8.28 (4th Ed) | ||
Jun 05, 2005 | If you want your final mailed back to you, bring three stamps to the final with you, and stick them on the back page as indicated | ||
Jun 05, 2005 | The FINAL will be comprehensive - I suggest you do the ones from previous quarters for practice | ||
Jun 05, 2005 | CHEM 30A FINAL IS ON THURS JUN 16 FROM 8:00-11:00 AM... Make sure you go to the correct room for the FINAL: room assignments are based on the first letter of your last name: A-J, N-Z in CS50, K-M in Haines A2 | ||
Jun 05, 2005 |
DOs and DON'Ts for the FINAL: | ||
Jun 05, 2005 |
GRADING POLICY for the FINAL: | ||
Jun 05, 2005 | Wednesday's lecture will comprise Quiz 3 and Evaluations, and there will be a regular class on Friday | ||
Jun 05, 2005 | I will run a review session on Tuesday 14th June in CS76 from 3-6 pm, bring questions, I will not prepare anything... | ||
Jun 04, 2005 | I finally got around to correlating lecture attendance with exam performance for this quarter (I took attendance a couple of weeks ago) and the results are in... Overall, 236 students took midterm 2, and I have calculated the cumulative scores for all of those students - and it is the cumulative score (not midterm 2 score) that the following numbers are based on. Of the 50 students with the highest cumulative scores, 47 of them were in class on the day I took attendance. Of the 50 students with the lowest cumulative score (students that hadn't dropped before midterm 2), only 29 of them were in class on the day I took attendance... Draw your own conclusions. We can go further - let's split the class in half, the top 118 students and the bottom 118 students. 92% of the top half of the class attended lecture on the day I collected names, whereas only 65% of the bottom half of the class were there that day. As I've said in the past, I don't expect you to come to class, that's up to you, I won't make you. And if you can get an 'A' (or a grade you are happy with) without coming, then great. On the other hand, should you not be satisfied with your grade at the end of this class AND you did not come to lecture (or, more importantly, my office hours) - don't even think for one second about complaining about your grade... to me, or anyone else for that matter... | ||
Jun 03, 2005 | Someone left their cell phone in class today - I handed it in to the mail and information window in Young Hall (3rd floor) | ||
Jun 03, 2005 | Lecture 23 Assignments: Reading Review Ch 8 (3rd Ed); Review Ch 9 (4th Ed) Problems 8.42-8.50 not 8.46g,h (3rd Ed); 9.43-9.53 not 9.47g,h (4th Ed) | ||
May 23, 2005 | Lecture 22 Assignments: Reading 8.6-8.10 (3rd Ed); 9.5-9.11 (4th Ed) Problems 8.30-8.41 (3rd Ed); 9.31-9.42 (4th Ed) | ||
May 30, 2005 | I will probably have some extra office hours Tuesday at 5 pm, just one hour this time though... | ||
May 26, 2005 | Overall the midterm was quite a disappointment. Q1 was very similar to questions like that from previous midterms... Q2 was a pretty simple mechanism (why were you drawing primary carbocations?) Q3 was straight from the notes (except for the azide part, and that just required a little bit of thinking) Q4 was a tough one, but nothing more than an o-chem logic problem... and Q5 should have been no problem for those of you who looked at previous midterms, and came to my office hours - I have asked very similar questions in the past... I suggest you all try the midterm again... | ||
May 26, 2005 | Well, the midterm is graded... High was 75/100, Low was -1/100 (yes, -1) and the mean was a poor 32% | ||
May 23, 2005 | Susan will be having an informal office hour inside Kerckhoff from 7:30-8:30 pm tomorrow evening: It will be question and answer format. | ||
May 23, 2005 | I've been getting a lot of questions about what mechanisms (or parts of mechanisms) you are responsible for knowing. In general, if I go over something on the board in class, I expect you to know it; If I don't go over something in class, but tell you to do it for homework, I expect you to know it; sometimes I will explicitly say that you don't need to know part of a mechanism, so, for example, in the second step of the oxymercuration of alkenes, you don't need to know how the NaBH4 converts the C-Hg bond into a C-H bond, and for the hydroboration/protonolysis of alkynes, you don't need to know the mechanism for how the acetic acid converts the C-B bond into a C-H bond, and for the osmium tetroxide dihydroxylation reaction, you do not need to know how the osmate ester is cleaved - for all the other mechanisms, however, you need to know all of the steps, such as how a trialkylborane is converted into a trialkylborate; how a terminal alkyne can be converted into an aldehyde or a ketone, and how an ozonide can be converted into carbonyl compounds when treated with dimethyl sulfide... | ||
May 23, 2005 | Lecture 21 Assignments: Same as for Lec 20, and you have a midterm to study for... | ||
May 23, 2005 | Make sure you go to the correct room for the midterm: room assignments are based on the first letter of your last name: A-O in CS50, P-Z in Royce 190 | ||
May 23, 2005 |
DOs and DON'Ts for the midterm: | ||
May 20, 2005 | Lecture 20 Assignments: Reading 8.1-8.6 (3rd Ed); 7.8-7.9, 9.1-9.2 (4th Ed) Problems 8.1-8.29 (3rd Ed); 9.1-9.30 (4th Ed) | ||
May 18, 2005 | Lecture 19 Assignments: Reading 10.7-10.9, 8.1-8.2 (3rd Ed); 9.1-9.5 (4th Ed) Problems 10.4, 10.15-10.17, 10.21-10.23 (3rd Ed); 7.4, 7.5, 7.10-7.12, 7.16-7.18 (4th Ed) | ||
May 16, 2005 | Lecture 18 Assignments: Reading 6.5-6.7, 10.9 (3rd Ed); 6.5-6.7, 7.6 (4th Ed) Problems 6.43-6.49 (3rd Ed); 6.41-6.52 (4th Ed) | ||
May 13, 2005 | Lecture 17 Assignments: Reading Rest of Ch 6 Problems 6.9-6.11, 6.13, 6.17-6.42 (3rd Ed); 6.7-6.9, 6.12, 6.16-6.40 (4th Ed) | ||
May 12, 2005 | Starting to post reaction mechanism summaries - the first two are posted below... | ||
May 11, 2005 | Lecture 16 Assignments: Reading 6.3-6.6 Problems 6.9, 6.10 (3rd Ed); 6.7, 6.8 (4th Ed) | ||
May 9, 2005 | Lecture 15 Assignments: Reading 6.3-6.5 Problems 6.3-6.8, 6.14-6.16 (3rd Ed); 6.1-6.6, 6.13-6.15 (4th Ed) | ||
May 8, 2005 | Lecture 14 Assignments: Reading 6.1-6.3 Problems 6.1, 6.2 (3rd Ed) | ||
May 4, 2005 | The first problem of the acids and bases problem set has an error, part (a) should be Cl3CCO2H, i.e., there is a carbon atom missing... | ||
May 4, 2005 | Lecture 13 Assignments: Reading Ch 5, 6.1-6.3 Problems Finish Ch 4 problems and Ch 5 as well | ||
May 2, 2005 | Lecture 12 Assignments: Reading Ch 4 Problems 4.1-4.45 (3rd Ed); 4.1-4.47 (4th Ed) | ||
Apr 29, 2005 | Lecture 11 Assignments: Reading 3.6-3.9 and preview Ch 4 Problems 3.8, 3.9 (3rd Ed); 3.9, 3.10, 3.39, 3.40 (4th Ed) | ||
Apr 28, 2005 | The grading odyssey is over. Mean was 66/100, low was 10/100, high was 115/100 - well done | ||
Apr 25, 2005 | Lecture 10 Assignments: Reading 3.4-3.5 Problems 3.4-3.7, 3.24-3.32 (3rd Ed); 3.4-3.8, 3.25-3.33 (4th Ed) | ||
Apr 24, 2005 | Make sure you go to the correct room for the midterm: room assignments are based on the first letter of your last name: A-H in Royce 190, I-Z in CS50 | ||
Apr 24, 2005 |
DOs and DON'Ts for the midterm: | ||
Apr 24, 2005 | Lecture 9 Assignments: Reading 3.1-3.3 Problems 3.1-3.3, 3.10-3.23 (3rd Ed); 3.1-3.3, 3.11-3.24 (4th Ed) | ||
Apr 22, 2005 | Lecture 9 Assignments will be posted soon... maybe tomorrow | ||
Apr 20, 2005 | Lecture 8 Assignments: Reading 2.9, 2.10, 3.1, 3.2 Problems 2.10-2.16, 2.34-2.53 (3rd Ed); 2.11-2.15, 2.36-2.61 (4th Ed) | ||
Apr 18, 2005 | Lecture 7 Assignments: Reading Rest of Ch 2 Problems 2.10-2.12, 2.31-2.33 (3rd Ed); 2.9-2.11, 2.36-2.37 (4th Ed) | ||
Apr 15, 2005 | Lecture 6 Assignments: Reading 2.6-2.8 Problems 2.8, 2.9, 2.24-2.30 (3rd Ed); 2.7, 2.8, 2.28-2.37 (4th Ed) | ||
Apr 13, 2005 | Quiz 1 is graded. Mean was 18/30, high score was 35/30, low was 0/30... Key will be posted tomorrow | ||
Apr 13, 2005 | Lecture 5 Assignments: Reading 2-2.6 Problems 2.1, 2.2, 2.17-2.21 (3rd Ed); 2.1, 2.2, 2.16-2.25 (4th Ed) | ||
Apr 12, 2005 | A few people want me to clarify the difference between molecular shape and geometry. Shape refers to the whole molecule, whereas geometry refers to the local arrangement around a particular atom in a molecule. For example, ammonia is, overall, pyramidal, yet the geometry around the nitrogen atom is tetrahedral, but the fourth position is taken up by the lone pair. | ||
Apr 11, 2005 | Resonance Problem Set is posted below - answers will be posted tomorrow... Answers to the Molecular Structure Problem Sets are now posted | ||
Apr 11, 2005 | Lecture 4 Assignments: Problems 1.18, 1.55-1.71 (1.70 for 3rd Ed) | ||
Apr 08, 2005 | Lecture 3 Assignments: Reading Rest of Ch 1 Problems 1.14-1.17, 1.48-1.54 (3rd/4th Ed) | ||
Apr 08, 2005 | Molecular Structure Problem Sets are posted below - answers will be posted in a few days... Answers to the Molecular Shape Problem Sets are now posted | ||
Apr 08, 2005 | A handout clarifying the octet rule is posted below as there seems to be some confusion. Sincere thanks to the student who mumbled something about it being OK to violate it on one side of the lecture boards and not the other as they left class today. | ||
Apr 08, 2005 | It has come to my attention that some of you have been taught a formula to help you work out and draw Lewis structures. It is OK to use this approach, as long as you are aware of its limitations. Apparently, it does not work so well for systems that have expanded octets (S,P compounds etc.) or for molecules with unpaired electrons. There may be other instances in which it breaks down too, so be careful! | ||
Apr 06, 2005 | Molecular Shape Problem Sets are posted below - answers will be posted in a few days... | ||
Apr 06, 2005 | Lecture 2 Assignments: Reading 1.3-1.4 Problems 1.6-1.13, 1.23-1.47 (3rd/4th Ed) | ||
Apr 04, 2005 | Lecture 1 Assignments: Reading 1-1.4 Problems 1.1-1.5, 1.19-1.22 (3rd/4th Ed) | ||
Mar 24, 2005 | Chem 30A will be in CS50 in the Spring, not CS24 as originally planned | ||
Mar 14, 2005 | A quick note to say that Chem 30A will use the FOURTH edition of Brown & Foote in Spring quarter - it won't be dramatically different to the previous incarnation, but all questions will be assigned from the new edition... and you won't be able to sell the 3rd edition back to the bookstore once the 4th edition is out (at least I think that's right...) | ||
Mar 14, 2005 | If you are looking for a molecular model kit, they probably have some at the Student Store, but you can also get them on Amazon, it's expensive, but cheaper than most textbooks after all, and you could probably re-sell it in the future... | ||
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