Hi folks,
First off, NO CLASS NEXT WEEK. We have spring break next week so we won't be holding class.
Second, no video of class this week. Just about the entire class was spent doing the lab, so there was nothing much to record.
Today we took the time to do another lab. I had the students create silly putty using water, borax and glue. The point of the experiment was to carefully measure the masses of the three different substances and determine the ideal ratios of the materials needed to create just the right amount of silly putty with nothing left over.
Homework for this week is to:
1. Figure out (if you haven't already in class) how much water, borax and glue you would need to create 1000g of silly putty with nothing left over.
2. Using the masses you found in class, calculate how many moles of materials you used to create your "perfect" silly putty. The formulas for Borax and glue are on the sheets you received in class. Borax has a very strange formula with a 10H2O thing tacked to it. That's what happens when it combines with water.
Read pp. 271 - 279 in the Conceptual Chemistry book.
Do exercises pg. 303 #'s 1 - 9
Do problems pg. 304 #'s 1-4
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