Teacher resources and professional development across the curriculum

Teacher professional development and classroom resources across the curriculum

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Sub Image2:Macro to Micro Structures
1) Atoms and Molecules2) Macro to Micro Structures 3) Energetics and Dynamics 4) Theory and Practice in Chemical Systems 5) Chemical Design 6) The Chemistry of Life 7) Chemistry and the Environment 8) Chemistry at the Interface
From: Katie Johnson (johnson5@madison.k12.wi.us)
Date: Tue Mar 18 2003 - 16:44:02 EST


I really liked your ideas. Especially the density one.

>Here are some of the measurement projects I've done in the past few >years:
>2. The students make 3 different concentrations of salt water, color them
different colors and make a density column with a straw or glass tube.
I do density at the beginning of the year, and I love this idea. I think
it would be a great way to visually reinforce the idea of density.

I have my students do the density of lead shot using water displacement to
find the volume. We graph the data and use the slope as a density value.
--It is a good way to discuss accuracy and the value to making many trials
due to the potential that a single lab value may be in error.
--We also discuss the advantage of a graph to visually identify an
discrepant piece of data.
--We also discuss why the graph is better than just averaging all the data
in the table (the average will include a "bad" data point but the
line-of-best-fit can ignore it).

I have enjoyed the discussions and the videos.


Katherine Johnson
Chemistry Teacher
Madison East High School
Madison, Wisconsin


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