I’ve been getting a lot of office visits and emails over the same homework problem. Folks say, “I typed CH3CH2CH(CH3)CH(CH3)CH3” or “I typed CH3(CH3)CHCH…” or “I typed CH3CH(CH3)CH…” and it was marked incorrect. =(
The Day 3 materials offered a small taste of where we are headed next: the 3-D world of molecules. Carbon is tetrahedral.
Does this wedge-dashed diagram make sense? Can you rotate it in your head (rotate around any bond or any axis, rotate by any amount 90, 180, 240 degrees)? Can you the rotated figure? Can you reflect it through a plane of symmetry? Can you rotate and reflect and draw? One carbon is just the beginning, my friends!
Model kits are really valuable learning and thinking aids. What is more, I permit you to use models on quizzes and the final exam! (see Exams policies) If you would like to purchase a molecular model kit, I highly recommend the kit shown on the left. You can buy it at the Chemistry stockroom. $20. Cash. Or buy a (slightly, gently used and well-kept) kit from a former o chem student.
Welcome back to Reed. We have an exciting organic chemistry curriculum planned for Chem 201 and 202, and we will get off to a flying start so here goes…
Day 1 is our first day of classes. It will include a lecture for the MW section at M, Aug 27, 2:20 pm in Eliot 314 (the TuTh section starts the next day at 10:30 am) and a lab lecture for all students at M, Aug 27, 6:10 pm in Psych 105. Your attendance on Day 1 is absolutely required.
The following will tell you what you need to do on Day 0, the time before the first lecture, lab lecture, and lab. Please read and follow these instructions carefully. And see you in class! (Note: the following was sent to all students by email. Check your Inbox.)
The discovery of the electron in 1897 was followed just 14 years later by the discovery of the atomic nucleus in 1911. In 1913 Bohr proposed a model of the hydrogen atom in which the electron made perfectly circular orbits around the newly discovered nucleus (proton) only to see his theory replaced by Schrödinger’s more general theory, wave mechanics, in 1926. Wave mechanics has dominated the thinking of chemists ever since, but it has hardly been the last word on the matter. More subatomic particles have been discovered, and other forms of quantum mechanics have been suggested over the years (matrix mechanics, density functional theory, …) including theories (quantum electrodynamics, quantum chromodynamics, …) that go far beyond the simplistic thinking of chemists.
So what really happens when two electrons, or perhaps an electron and a positively charged nucleus, get really, really close to each other? Wave mechanics turns to Coulomb’s law for help, and Coulomb states that the force between these particles varies inversely with the square of the distance between them, that is, the force is proportional to 1/r^2. This would imply that the force (and the potential energy associated with it) approaches infinity as r approaches zero. This can lead to disturbing thoughts (what keeps electrons from ‘falling into’ the nucleus?) and disturbing mathematical problems (how do I work with a formula that busts its way to infinity?).
Nautilus recently emailed me an old article (“The Trouble with Theories of Everything”, 1 Oct 2015) that looks into these disturbing corners of science and concludes, “There is no known physics theory that is true at every scale—there may never be.” Coulomb’s law, wave mechanics, you name it – are designed to explained certain phenomena that appear on certain scales of time, space, energy, and so. It may be possible to extrapolate them to other scales successfully, but there are no guarantees. Caveat extrapolator!
throw yourself at anyone,
decked out in diamonds.
And that pretty much sums it up. Carbon is awesome.
Interested in seeing how the other elements fare when filtered through haiku paper? Check out Elemental Haiku (Science, 4 Aug 2017) or, even easier, find them in this interactive periodic table.
Note: element 119 has not been synthesized yet so the poet has already gone where no scientist has been (yet).
What’s so special about the sunlight during an eclipse? Isn’t it the same old sunlight we see the rest of the time?
Yes, it is, but because the event is so interesting to look at, and because the normally blinding solar disk is partly blocked out, the temptation is to look, and look, and look. See “Chemistry explains why you shouldn’t stare at the solar eclipse without proper protection” (C&ENews, print 21 Aug 2017, online 14 Aug 2017).
The article explains the photochemical events that trigger retinal damage (the “heat” of the sunlight is not to blame) and it describes several options for safe viewing of the Sun. Here’s a bit from the article: Continue reading
This web page will not be maintained during the 2017-18 academic year. All course-related materials should be obtained from the appropriate Moodle pages. This site will resume business in Fall, 2018.
A new article in Science magazine from Prof. Ayanna Thomas’ research group is one that every O Chem student should look at. The article doesn’t contain any chemistry, but it contains some potentially valuable insights into becoming a more successful O Chem student.
The DoJo will have drop-in tutoring available 7-9 PM for Chem 201 on Sat (12/10) and Mon (12/12).
Sam and Alan will also be in their offices for drop-in-consultation for much of Th/F/M/Tu/W, weather permitting.
Some of you may be suffering from FMOOWMP. You know the symptoms, but you probably didn’t know that help was close at hand. And it’s painless. Here’s a short video to bring you up-to-speed. https://youtu.be/yQq1-_ujXrM