New Stuff for Fall '10

Classes won’t start for another 10 days and I will be making a number of changes to this web page before then. please check back from time to time to learn about the latest changes. Friday, Aug 20, 2010

Pre-registration, wait lists, and all that …

  • You must complete the
    prerequisites for Chem 201 before you can preregister. That means if
    you took intro chem (the equivalent of Chem 101/102, lecture + lab) at
    another school this summer, you need to provide evidence of satisfactory
    completion of these courses to Reed’s Registrar’s Office before SOLAR
    will allow you to preregister for Chem 201. This requirement may create difficulties for some students because it often takes a few days to process transfer requests. Here’s a shortcut: bring me a signed note on Th-F, Aug 26-7, from your introductory chemistry instructor (email is also acceptable)
    that says you have completed the entire intro chem sequence, lecture and labs, with grades of C- or
    better, I will override
    SOLAR’s prerequisite requirement so that you can preregister for Chem 201. posted Friday, Aug 20
  • New lab section – Friday, 1-5 PM. 69 students have preregistered for Chem 201 lecture, but only 62 for lab. The others have put their names on waiting lists (or so I hope). To accommodate everyone’s schedule, we have added a fourth lab section on Friday afternoon. It appears in SOLAR as #11096, CHEM 201 FL4. We will not be making any other changes in the lab schedule. For safety reasons lab sections are capped at 24 students so it is necessary for everyone to find a spot in the four lab sections that are now available. (see all Hours & Locations) posted Friday, Aug 20
  • New conference section – Thursday, 12-1 PM. 24 students have already preregistered for the noon conference and there might be more on a waiting list. Because “conference” can’t function in a useful way when there are more than 16 students in a room, we have added a second room (Chem 301). The Registrar will (re)assign students to particular sections and rooms to keep all conference enrollments at 16 or less. Please attend the conference + room that the Registrar assigns you to. (see all Hours & Locations) posted Tuesday, Aug 24

Updates & New Stuff

  • Spartan Model 2 replaces plastic model kit as required item (also read) posted Friday, Aug 20
  • Luc Boisvert (visiting prof.) replaces Pat McDougal (sabbatical 2010-11) as conference and lab instructor posted Friday, Aug 20
  • A syllabus has been posted that provides information about each class and exam dates. Expect additions and other changes. posted Tuesday, Aug 24
  • The Exams page has been updated. It contains exam dates and ground rules. Links to old exams will be added later. posted Tuesday, Aug 24
  • All students should purchase a clicker on Friday, Aug 27 (if you forget, you can still purchase one the following week). Bring your clicker to all of the 9 AM lectures starting with the first class on Mon, Aug 30. See Clickers and Books & Materials for more information. posted Thursday, Aug 26
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Pre-registration for Fall 2010

Students who want to earn one unit of credit for Chem 201 in Fall 2010 must sign up for four activities:

  • lecture (MWF 9-10 AM)
  • conference (choose from Th 9:30, 10:30, 12, 1 and always attend the same conference)
  • lab lecture (Th 6:10-7 PM)
  • lab (choose from MTuW 1-5 PM and always attend the same lab)

It is not unusual for certain conferences and labs to fill up during pre-registration; the Tu lab was particularly popular last fall. It is also not unusual for students to change their plans during the summer and want to change sections, add the course, or drop the course, during fall pre-registration. To add to the general uncertainty, I have no idea how many students will pre-register for the course in the spring.

Here are some common pre-registration requests and my customary responses:

  • I cannot override the enrollment caps on conference and lab. The lab situation is simple: we only have room for 24 students in each lab section and not one person more. The conference situation is more complicated. We will reassign students to conferences in the fall to make sure that each conference has roughly the same enrollment.
  • I cannot override the Chem 101/102 prerequisite for students who haven’t completed these courses. This includes students who plan to complete these courses during the summer. If you complete the prerequisite during the summer and your institution is “slow” to send a transcript of your summer work to Reed, have your summer instructor send me a note (email is fine) that you have passed these classes and I will override the prerequisite requirement during pre-registration in August.
  • I will approve conflicts with the lab lecture on Th evening. However, I do this only with the mutual understanding that the student accepts full responsibility for any missed material. I will not give make-up lectures, explain parts of lecture, provide copies of my lecture notes, and so on, to students who miss class because of a conflict with another activity.

If a student finds that a must-have lab or conference section closes during pre-registration, I recommend the following: first, pre-register for courses assuming that the section will stay closed (call this Plan B), and second, contact me during the August pre-registration period and explain which “closed” section you want to enter and why, i.e., give me Plan A. The Registrar and I will use our (limited) powers of persuasion to move students around and accommodate requests.

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Chem 201-202 Transition State

Welcome back!

Chem 202 pretty much picks up right where Chem 201 left off: same book, same rooms, same hours. There are some important changes, however, so please check out the following.

  • Lecture. My role will be reduced. Pat McDougal will take over all of the lectures and all that that entails (homework assignments, exams, and so on).
  • Conference. Pat and I will swap conference sections. He will direct the morning sessions and I will direct the afternoon sessions.
  • Lab. I will continue on in the Tuesday lab, and Pat will take over the Monday and Wednesday labs.
  • Online materials. Pat will distribute assignments in whatever way he likes best, but with only one important exception: he won’t use this website. The exception is the online lab manual. This manual includes all of the experiments currently planned for Chem 202.

If you have questions about how Chem 202 will operate, please direct them to Pat (Rm. 420, ext. 7206, Patrick.McDougal@reed.edu)

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The Final Exam

The final exam was a 200 point exam. All kinds of scores were obtained, but they seemed to fall into three groups. Medium-low, medium, and high. Interesting.

After grading the exam and reflecting on the degree of difficulty, I decided to add 10 points to the “raw score” on each exam to arrive at a “final score”. The following distribution is based on final scores.

60-79 points – 3 exams
80-99 points – 14 exams
100-119 points – 9 exams
120-139 points – 16 exams
140-159 points – 8 exams
160-179 points – 11 exams
180-200 points – 2 exams

Median score: 128 points

If you have questions or comments about the exam, come see me.

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Last Semester's Paperwork

I spent a good chunk of winter break buried in paperwork. The stack of final exams, lab reports, and late homework assignments was almost 10 inches thick, but I eventually got through it.

Now I want it to go away, all of it. Well, not just go away (I could have dumped it in the recycling if I just wanted to make it go away), but actually get it back into your hands where it might do some good.

Please stop by Kathy Kennedy’s office, room 303, and collect your papers before next Friday, January 29. Thanks.

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Exam #4 answers

The answers to the final exam have been posted on the Exams page.

I haven’t finished reading the exams yet (I’ve read page one of about
40 exams so far), but an interesting thought occurred to me this past
week that I wanted to share with you.
Continue reading

Posted in Exams | 2 Comments

The Paper Trail

I will try to keep you up-to-date by email, but here is where things stand:

HW #1-7 – everything that I have ever received has been read and returned. If you don’t have your assignment, check the box outside my door. If it isn’t there …

HW #8 – I am currently reading these and adding them to the papers outside my door. I expect to finish them before I leave work today, but I can’t promise that.

Exam #1-3 – everything that I have ever received has been graded and returned. If you don’t have your exam, check with Kathy Kennedy, Rm. 303.

Lab reports – I have returned all lab reports except for the isopentyl acetate (banana oil) and acetylferrocene. I will begin returning some of the isopentyl acetate reports today and that will continue through the weekend. I hope to have them all read by Sunday afternoon, but we will see … You will not be allowed to revise either the isopentyl acetate or acetylferrocene reports. What’s done is done.

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Q&A session for Final Exam

Where: Rm. 301, Chemistry
When: Sunday, Dec 13, 1:45-3:00

I decided to go with Rm. 301 because the number of students attending these Q&A sessions has fallen considerably. I hope there will be enough room. The Chem 101 people will want to use the room from 3-4 PM so please *ask* your questions during the allotted time. Don’t wait until after its over.

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(Somewhat) polar C-H bonds

Today’s activity (ChemActivity 34R) used potential surfaces to assign charges to hydrogen atoms in ethylene and acetylene. The charge trend goes like this (I’ve added ethane for good measure):

(least +) H in ethane < H in ethylene < H in acetylene << H in water (most +)

This trend can be rationalized by thinking about the energies of the overlapping atomic orbitals.

Continue reading

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Move over Facebook

The web is a great place to waste, uh, invest one’s spare time, assuming one has any time to spare. YouTube, Facebook, they all have their aficianados, but my cousin Arkee, a retired professor at Tel Aviv University, just alerted me to a totally cool, totally science geek-oriented web site: Trailblazing: Three and a half centuries of Royal Society publishing.

It’s simple to use. You zoom along the time line, click on a year, and see what pops up. Not only do you get beautiful images and well-written explanations about amazing scientific trivia (do you know what kind of animal blood was used in the first blood transfusion?), you also get links to the original Royal Society publications. The following abstract was written by Isaac Newton himself (click on it to expand the image).

Isaac_Newton.gif

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