Atomic Emission Kit

Submitted by Maggie Geselbracht / Reed College on Mon, 04/07/2008 - 17:24

Does anyone have any experience with the atomic emission kit that is available from Flynn Scientific?  The set-up is a metal can that fits over a Bunsen burner.  H2 gas is generated from Zn and HCl, which supposedly carries metal ions (Li+, Na+, etc.) up through the can and into the flame for easy viewing of the atomic emission spectra.

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Teaching

Question about an observation in the laboratory

Submitted by Hilary Eppley / DePauw University on Sat, 04/05/2008 - 17:02
I have a question that perhaps someone will have an answer to-- in the lab last week I had students adding TiCl4 to water to show that it creates a very acidic solution and generates HCl gas. One thing that has always bothered me when I've done that reaction is that in addition to the expected white TiO2 precipitate, a bright yellow compound is also generated in many cases. Anyone have any idea what that could be? It has always stumped me...
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Teaching

Avoiding the long afternoon

Submitted by Adam Johnson / Harvey Mudd College on Sat, 03/08/2008 - 11:00

What are strategies you have/use to deal with/help students who all of a sudden (or slowly, gradually, all afternoon) find themselves with 30 minutes left in a lab period, with 2 hours of work left to do.  How do you head this off, especially in a large lab section?  How do you deal with it once its too late?

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Teaching
Tags
procrastination
slow students
student preparation
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