This means that if you mix yeast with hydrogen peroxide, the hydrogen peroxide will rapidly break down into water and oxygen gas. The oxygen gas forms bubbles. These bubbles would usually escape from the liquid and pop quickly. But, adding a little dish soap provides additional surface tension, allowing the bubbles to get trapped and creating lots of foam. This foam looks like a giant squeeze of toothpaste—almost big enough for an elephant!
In a measuring cup mix together one tablespoon of yeast and three tablespoons of warm water. Stir for about 30 seconds. Pour the yeast mixture into the bottle then quickly step back, and watch your reaction go!
What happens? How long does the reaction last? Extra: Try the activity without the dish soap. How was the result different? Extra: Try the activity with different-shaped containers. What happens if you use a bottle with a narrower or wider neck—or a cylindrical drinking glass with no neck? Build a Cooler.
Get smart. Sign up for our email newsletter. Sign Up. Support science journalism. Knowledge awaits. Pour the hydrogen peroxide into the PET bottle via the funnel. Remove the funnel and place the PET bottle on the plastic tray or baking dish. Add a large squirt of dishwashing detergent to the PET bottle. Add a squirt of food colouring. In the small cup, empty a sachet of dry yeast and add four tablespoons of lukewarm water. Mix well.
Quickly add the yeast mixture to the PET bottle via the funnel. Quickly remove the funnel, stand back and watch what happens. Further investigation Try making the elephant toothpaste in different sized PET bottles or in containers with different shaped openings to determine how these affect the stream of foam.
What's happening? Real world links Hydrogen peroxide is commonly found in hair colouring products. Become a Q Club Member. Step 4 — Next, add a squirt of dish soap into the bottle. Again, take a moment observe what happened. Did adding the dish soap appear to have any effect on the liquid already in the bottle?
Step 5 — Finally, pour the mixture of water and yeast into the bottle. Watch carefully and observe what happens. Helpful Tip: You may need to gently swirl the bottle in order to get the items to completely combine. Sit back and watch what happens. Write down your observations as you watch the experiment. Can you describe what happens when you add the water and yeast mixture to the bottle. Wondering what caused the liquid to react that way?
Find out the answer in the how does this experiment work section below. This experiment shows a very impressive and fast chemical reaction! Hydrogen peroxide is a combination of hydrogen and oxygen H2O2. In this experiment, yeast is a catalyst that helps release oxygen molecules from the hydrogen peroxide solution.
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