Lesson 4 in Apologia’s Chemistry and Physics textbook mentions polymers. The project to grow crystals. But these are younger kiddos! We’re making slime, one polymer kiddos can understand. I happen to like making slime and have a few recipes: Stretchy Hair Gel Slime, Hair Conditioner Slime, and these slime recipes from HST.
Do you want a little background? ACS The Joy in Toys has a bit of background about polymers. Playing with Polymers and teacher’s notes comprise a lesson, Please note that the links in the teacher’s guide are broken. However, the notes can guide you if you want details about how to present the polymers materials.

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