Wednesday, February 10, 2010

General Science: Physical and chemical properties

This week we continued our exploration of physical and chemical change by investigating 4 different white powders: sugar, salt, potato starch, and baking soda. The kids used microscopes to collect data on how these substances appear magnified 100X. They also tested and recorded if and in what way each one reacts with vinegar, iodine, and whether or not they conduct electricity when dissolved in water. Each kid now has a fairly comprehensive data sheet on these substances and their physical and chemical properties. If by chance, they should come into contact with some unknown white substance, you can rest assured, they've studied them extensively and will have no problem making an identification.

One never knows when these skills and/or data might come in handy...

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