Just a reminder for CHM 100 students:  We’ll be having our first lab exam next week (10/6 for section 1, 10/8 for section 2).  If you have not done so already, please have a look at the [study guide for the first lab test] to help you prepare.

Note for those with a lab absence:  You are responsible for knowing what went on in each experiment whether you were there or not, so if you missed an experiment, you should contact your lab partner(s) and find out what you missed – and you should also read the entire experiment in the book several times to make sure you understand what the experiment was about.

Any questions?  Ask here, or ask me via e-mail or in person.

Here’s the shared data from CHM 110 Experiment 3B. These are the ratios of mass product / mass barium chloride dihydrate that you need to complete the table on page 74 and answer the questions on pages 75 and 76.  This is data for the Wednesday lab section (section 2)!

Ratio of (mass product / mass BaCl2.2H2O):

• 0.8495
• 0.8519
• 0.8520
• 0.8510
• 0.8503

The write-up for Experiment 3B is due at our next lab meeting. If you have any questions about either the calculations or the rest of the write-up, either come by my office or ask here in comments.  We will discuss the calculations for this lab in Tuesday’s class.

I recommend that you use your TI-83 calculator or a spreadsheet to find the standard deviation – you don’t have to calculate it by hand.

If you’re reading this, you probably already know that I was out sick on 9/28/09 (Monday).  Here’s how that will affect your chemistry classes:

CHM 100 (all sections):  Turn in the quiz that was due today on Wednesday (9/30).  Lab will meet as scheduled tomorrow, and lecture will meet as scheduled on Wednesday.

CHM 110 – 01:  Monday’s lab is cancelled.  We will do Experiment 4C next week as scheduled.

CHM 110-02:  Wednesday’s lab (Experiment 3B) will meet as scheduled.