From: Katie Johnson (johnson5@madison.k12.wi.us)
Date: Tue Mar 18 2003 - 16:44:02 EST
Susan,
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.
--katie
Katherine Johnson
Chemistry Teacher
Madison East High School
Madison, Wisconsin
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