Looking for a fun an easy experiment that will excite your kids? Explore an exothermic reaction in elephant toothpaste. As always make sure your child has adult supervision with this and all of our experiments.
Plastic tablecloth and/or container,
1-liter soda bottle,
What to do:
- First, put on your safety glasses and rubber gloves.
- Then make sure to cover your work area with a plastic tablecloth or put a big container out to work over.
- Use a funnel to add 4 ounces (1/2 cup) of 40- volume hydrogen peroxide to the empty and clean 1-liter soda bottle. You can find 40-volume hydrogen peroxide in the link above or at your local beauty supply store.
- Next, add a squirt of dish soap and some food coloring to the hydrogen peroxide in the bottle.
- Give the solution a quick swirl to mix the contents together.
- Then you will mix an entire a package of dry yeast with 4 tablespoons of very warm water in a plastic cup.
- Stir the mixture with a spoon, if the mixture is too thick or paste-like, add a small amount of water to thin it out.
- Now, pour the yeast mixture into the bottle and watch what happens.
How it works:
The yeast works as a catalyst to release the oxygen molecules from the hydrogen peroxide solution. The oxygen-filled bubbles, which make up the foam, are actually the remainder of what happens when the hydrogen peroxide breaks down into water and oxygen. The bottle will feel warm to touch because this is an exothermic reaction in which energy, in the form of heat, is given off.
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