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Chemistry messes: Difference between revisions
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* '''What to Do''': Mix glue, water, and food coloring in one cup. In another cup, mix warm water and borax. Combine the two mixtures, add cornstarch, and knead until it becomes bouncy and moldable. Shape into balls and bounce them! | * '''What to Do''': Mix glue, water, and food coloring in one cup. In another cup, mix warm water and borax. Combine the two mixtures, add cornstarch, and knead until it becomes bouncy and moldable. Shape into balls and bounce them! | ||
* '''Mess Level''': High (sticky hands and goo everywhere). | * '''Mess Level''': High (sticky hands and goo everywhere). | ||
=== '''Walking on Water with Oobleck''' === | |||
* '''What it Teaches''': Non-Newtonian fluids behave like solids under pressure and like liquids when pressure is removed. | |||
* '''What You'll Need''': | |||
** LOTS of cornstarch (about 50 lbs for a small kiddie pool or large tray) | |||
** Water | |||
** A large plastic kiddie pool or big sturdy tray | |||
** Food coloring (optional, for extra fun) | |||
** Towels for cleanup | |||
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=== '''How to Do It''': === | |||
# '''Set Up''': | |||
#* Place the kiddie pool or tray in a wide-open space (preferably outdoors or on a tarp to minimize mess). | |||
# '''Mix Oobleck''': | |||
#* The ratio is roughly '''2 parts cornstarch to 1 part water'''. Gradually add water to the cornstarch and mix until you reach the desired consistency. The mixture should feel solid when you apply pressure but flow like a liquid when you release. | |||
#* If you want, you can add food coloring to make it colorful and exciting! | |||
# '''Walk on It''': | |||
#* Let students take turns walking (or even running) across the surface. | |||
#* They need to move quickly because if they stop, they'll sink! This demonstrates how pressure affects the properties of the oobleck. | |||
# '''Clean Up''': | |||
#* Have towels ready for cleaning feet and hands. The mixture can be rinsed away with water as it’s biodegradable. | |||
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=== '''Safety Tips''': === | |||
* Make sure students don’t try to jump or dive into the mixture—it’s not deep enough for that! | |||
* Use old clothes and shoes because it’s messy. | |||
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