CEM131 Issue with Problem

While I am grading the exam I noticed that I didn’t use the final (corrected) form of one problem and left a typo in that makes the problem unsolvable.

42. Iodine-131 is used to image thyroid tissue to determine the presence of thyroid cancer.  Iodine-131 degrades through a beta followed by gamma mechanism.  Determine the final product that is produced by the decay of iodine-131.  If you can make a 2.0 mCi/ml solution of iodine-131 how much would have to be made 72 hours before the test (half-life: 8 hours) to make a solution with an activity of 7.4 x 10^3 Bq/ml for the test?

The last unit should have been in Bq, not Bq/ml.  The question makes no sense at the end with the volume in the unit.  However, much of the problem is solvable.  So for the five points I will divide it as follows.  One point for the decay equation.  One point for the conversion of mCi/ml to Bq/ml or Bq/ml to mCi/ml. One point for the determination of the number of elapsed half-lives.  If you made an effort at those you will get the last two points (even if you lost some in the previous three) for what would have been determining the amount of radiation needed and then the volume of stock needed.  However, if you did not attempt the problem, or only trivially addressed it, you will not get the two final points.

My apologies, I pulled up an old draft when I printed it out.

Week 4


  • CEM131 – Start Chapter 3, Daily Quiz
  • No later office hours, Curriculum Meeting


  • BIO220 – Exam 1 (starts at 9:00), Endospore Staining Lab
  • BIO161 – Exam 1, no lab


  • CEM131 – Daily Quiz, Continue in Chapter 3, Emission Spectra Lab


  • BIO220 – Start Chapter 5
  • BIO161 – Daily Quiz, Start Chapter 26

Grades for CEM131

I have finished the first grade set for CEM131.  However, you will have to wait till Monday to get your student number.  The class median on the exam was a 79%, so there was no curve.  In addition, a number of students scored greater than a 90% on the exam.

CEM131 Post Exam 1 PDF

You need a student number to really find your grades, though you could probably do it with your quiz grades if you tried.

Drop Date for Classes

Jackson College LogoNot that I think this applies to anyone, but in the spirit of information, the last day to drop any of my courses without receiving a “W” is Friday, January 27th.  After that point you will be considered Withdrawn (“W”) rather than dropped and that has implications on your transcript/financial aid.

CEM131 DQ Answers

Image of a checked box on an examOne of the real challenges in Chemistry is simply getting enough worked examples and practice.  Since I rewrite the Daily Quizzes every term, it is easy for me to post the answers from the quizzes I give you with the calculations worked out.  This isn’t meant as a substitute for actual practice, but rather as a supplement for your use and as insight into how I write chemistry problems.  The PowerPoint is at the bottom of the PowerPoint files on the CEM131 page. It is a live document on Office 365, so it will update each day when I change it.

Week 2 of Winter 2017

It is the second week of the term.  As we progress you need to focus on the Daily Quizzes (BIO161/CEM131) and think about the first exams coming up in a couple of weeks.

Monday:  CEM131-DQ2, Finish Chapter 1, start Chapter 2

Tuesday:  BIO220-Chapter 2 (Chemistry), Finish Nature of Science Lab, Microscope Use.  BIO161-DQ2, Chapters 21 (with some brought in from outside of the text and Chapter 20), Basic Techniques Lab (you should have the microscope labelled and metric system calculations done).

Wednesday:  CEM131-DQ3, Chapter 2 (Energy, Specific Heat), Dimensional Analysis practice, Specific Heat of a Metal Lab.

Thursday:  BIO220-Chapter 2(Chemistry)/Chapter 4(Cell Biology).  BIO161-DQ3, Chapter 21/22

Basic Website Navigation

Hello to all the new students.  This is my external website that I use as a Course Archive and Announcement page.  The website is based on a WordPress setup so many of you are probably familiar with the layout, but just in case here are a few pointers.

This is the Homepage.  Here is where I will post course announcements.  Each announcement will be tagged by class so you can use the tags to filter for your class.  You should keep this page bookmarked as it will have the most current status of the course, so if times get changed or class gets cancelled, it will be here first.

To the left (on a desktop/tablet) or in the hamburger menu (on mobile devices) are the individual course page listings.  Each class has its own archive.  These are where I will post the materials for the course and any handouts I may give.  I post all my PowerPoint files and numerous other files, but I do not provide a “course pack.”  I feel that such devices do not help you learn, but rather to simply memorize material.  In order to truly learn you must put information in your own context, not mine.  If you miss a class you are responsible to get the information (including schedule changes) you missed.  I will provide you with sections covered and schedule changes (if asked) but not notes for a missed class (ask a colleague).