Wednesday, October 27, 2010

Green Goo

Preschool Chemistry 101-Green Goo
For letter G and Halloween, we made green goo today. Originally, I had wanted to make the goo in small batches to send home. Aren't you glad that didn't pan out? :-) After a few failures, we went with larger batches. Many of the recipes you find on the Internet (including the one I have) show mixing a teaspoon at a time. Go big or go home, I say. This activity does require adult supervision. Here is what worked for us...

You will need:
Liquid starch
Food coloring
Small container/bowl for mixing
Spoon (we used Popsicle sticks and then disposed of them)

There are thousands of recipes out there for slime but this is what really worked for us today. I put a several drops of food coloring in the container and then added about 1/4 cup of glue. The kids mixed the food coloring and the glue. When the glue was green, I slowly added the liquid starch (less than a 1/4 cup). The kids stirred and stirred and were able to see and feel the chemical reaction. We let the goo sit for about five minutes and then rolled and kneaded the goo. Store goo in a zip-loc bag in the refrigerator.

I didn't measure the glue or the starch. It's preschool science not rocket science. It was just easier to pour the glue in and then add the starch. The consistency of the goo is between Silly Putty and Jell-o. We talked about chemistry, chemical reactions and molecules. Serious science mixed with serious fun.

If you make goo- try pulling the goo quickly, try pulling the goo slowly, roll the goo into a ball and drop onto the table, roll into a ball and set in a bowl or put on a table. Put the goo into the freezer for about an hour. What happens???

For more recipes search 'slime recipes' or 'silly putty recipes'. There are also lots and lots of video demonstrations on YouTube.

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