Tuesday, October 25, 2022

Chemistry on a Budget: Hand Warmer Design Challenge Update!

 The kids are setting up and testing different combinations of chemicals. I have charcoal, iron filings, calcium chloride, hydrogen peroxide, vinegar, and water.  I have Epsom salts, too.  I’ll let the kids test that, too.  Right now, the kids are combining the water gel crystals with the three liquids.  I instructed the kids to do several trials: charcoal and water, charcoal, salt, and water, charcoal and peroxide, etc.  The goal is a hand warmer which is 30-40 degrees Celsius for at least five minutes.  We might to a cost analysis, too.  So far, so good.

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