BIO161 Final Grades

Below are the final grades for BIO161.  There was not a curve due to the high median (in the eighties), but this is in line with course policy.  Overall performance was good, and the cladograms didn’t make me cry.

Congrats and good luck, don’t forget the student evals.  You won’t hurt my feelings, I’m sure ex-girlfriends have said much worse about me.


CEM131 Answers to Questions and the Obvious Thing I Forgot

Here is a copy of the questions from class with the last four answered.

Questions from Class

Now to the second issue, my huge brain fart in class.  I knew when I worked it out (which was about five minutes after the last person left) I would want to bang my head on the board for missing the obvious.  The problem was that we were solving the wrong problem.  The Dilution Equation (C1V1 = C2V2) works when you think about how you made each experiment, not comparing different experiments.  So looking at the second experiment you did, where you made the bleach solution by mixing 5 ml of bleach with 5 ml of water.  Instead of comparing this to experiment one, think about the dilution itself.  C1 = 1.7X10(-4) M, and the V1 = 5 ml (the amount of bleach added), C2 = x, and V2 = 10 ml (the amount of bleach plus the water added).  Solve for C2 = (C1 X V1)/V2 which gives you a concentration half the original.  in the third experiment, change V1 to 2.0 ml and you get 1/5 the original concentration.  I told you it was simple.

I apologize for the brain fart.  Sometimes when you are so used to doing the idea in your head, you forget how to translate it into the math… and this was one of those time.

Thoughts for Week of April 10th

CEM131: We will be finishing up the Gases chapter this week and starting on Solutions.  The Hardness of Water lab is this week’s lab fun.

BIO220: We will continue with Eukarya pathogens and start Unknowns.  I have posted the current grades, please review missing materials.

BIO161:  We will finish Protostomes on Tuesday and then the Exam on Thursday.  The lab will either be the field hike or dissection, depending on weather.