- 125ml 6% Hydrogen Peroxide (ask at the chemist)
- 1 Sachet Dry Yeast (powder) + a few tablespoons of warm water
- Detergent
- Food colouring
- Empty bottle
- Funnel
The reaction occurring is hydrogen peroxide decomposing into water and oxygen:
2H2O2 → 2H2O + O2
The bubbles are caused by the detergent capturing the oxygen. The foam is water and the colouring is made by the food colouring. The yeast is acting as a catalyst. The first few times I tried this, I was using yeast well past its used by date, and it didn't work very well, so make sure your yeast is relatively fresh. Yeast contains an enzyme called catalase. Catalase is found in nearly all organisms exposed to oxygen, and helps prevent cell damage caused by the by-products of oxygen metabolism. It actually catalyses this hydrogen peroxide reaction in living organisms.
I did this outside on our grass, and as the by-product is water, it is safe to have on the lawn. If you are inside, make sure you have a tray to capture the toothpaste as it squeezes out. Wearing gloves minimises the chances of your skin coming in contact with hydrogen peroxide.
If you want to make the reaction more vigorous - in which case you have to wear proper safety gear - then you can use potassium iodide as the catalyst. But you might not have that lying around the house. There is some more info here.
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