Find More  Science Experiments
A chemical reactionoccurs when substances are mixed together and are changed. Sometimes substances mix together and not much happens, at other times the results are pretty dramatic. Today we will look at a turbo charged chemical reaction. We will mix two substances together and add a catalyst, something to make the reaction happen faster.
What You Need:
- Plastic Soda Bottle
- Hydrogen Peroxcide
- Measuring Cup
- Dish Soap
- Food Coloring
- Dry Yeast
- Hot Water
Pour a cup of hydrogen peroxide in the liter soda bottle. Add a few drops of food coloring and a few drops of dish soap. In a separate bowl mix 1 teaspoon of yeast with two tablespoons of hot (not boiling – just use hot water from the faucet) water. Use the funnel to pour the yeast mixture into the mottle. Stand back!!
- HINT: Do this one OUTSIDE!
- HINT #2 If you want your geyser to spew more, use a plastic soda bottle that is smaller than a liter – a bottle that is smaller will have more foam shoot out of it.
Hydrogen peroxide has a lot of bubbles in it. If you let it sit long enough it will go “flat” – just like soda if you let it sit, the bubbles pop and eventually no carbination is left. When you add the yeast to the hydrogen peroxide the yeast makes this “going flat” happen super fast. The yeast breaks the hydrogen peroxide down into oxygen and water – a chemical reaction. The oxygen combines with the dish soap to make a whole lot of bubbles. In this experiment yeast is a catalyst. A catalyst speeds up a chemical reaction. Once the chemical reaction is over touch the foam – how does it feel? You might notice that the foam is a little bit warm. This chemical reaction is an exothermic one, that means that the chemical reaction produced a little heat.
Here are some websites and books that will give you more chemical reaction experiments to try:
- Science Bob: Fantastic Foaming Fountain 
- Science Rocks  Elephant’s Toothpaste (page 34-35)!
- Science Experiments that Fizz and Bubble : Foaming Fountain (pages 18-19)
- Super Simple Things To Do With Bubbles : Elephant’s Toothpaste (pages 14-15)
Words to Know:
Chemical Reaction – When a substances or substances is changed into a new substance.
Exothermic – A chemical reaction that produces heat.
Catalyst – Something that makes a chemical reaction happen faster.