When I find an experiment that looks fun, I print it out and stash it away until we're ready to use it. This was one of those times and unfortunately, I don't remember where I 'stole' it from. So sorry about that (you can probably google it to find the original post if you'd like), but here's what we did with awesome results:
Supplies:
-Empty water bottle
-Baking dish
-Packet of yeast
-Dish soap
-Hydrogen peroxide
-Warm water-Food coloring
Directions:
Measure 2 tablespoons of warm water in a separate container.
Next, add 1 teaspoon of yeast to the water:
Stir well. The yeast will catalyze (speed up) the reaction.
Next, put your water bottle in the middle of the baking pan. Add 1/2 cup of hydrogen peroxide, a squirt of dish soap, and 4-5 drops of food coloring. Swish the bottle around to mix the ingredients a bit.
Then add your yeast to your water mixture.
This is when you tell your kids that it's called Elephant Toothpaste because it looks like toothpaste coming out of a tube that's big enough for an elephant to use :)
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