You will need:
1- 1/2 cup 6% hydrogen peroxide (sold in beauty supply stores or online as 20 Volume Clear Developer )
2- 2 tsp. yeast (1 packet)
3- 3 tbsp. warm water
4- Dish soap
5- Food coloring (optional)
6- Empty 16oz plastic bottle
7- Funnel
8- Safety goggles
9- Tray or container to catch the foaming fun
Steps:
1- Protect your eyes since Hydrogen peroxide can irritate skin and eyes.
2- Use the funnel to carefully pour 1/2 cup of the hydrogen peroxide liquid into the empty water bottle.
3- Add 8-10 drops of food coloring to the bottle.
4- Add 1 tbsp. of liquid dish soap into the bottle and mix it a little bit.
5- Combine yeast and very warm water in a separate cup. Make sure most of the lumps disappear.
6- Pour the yeast mixture into the bottle. (using the funnel)
7- Quickly remove the funnel as bubbles rise out of the bottle. Now, the eruption of thick foam begins.
Explanation:
1- The yeast is used to speed up the reaction. It is a helper to remove the oxygen from the hydrogen peroxide.
2- This reaction is called an Exothermic Reaction. Not only did the reaction create foam, but it also created heat.
3- The tiny foam bubble is filled with oxygen.
4- The foam is just water, oxygen and soap.
“Do NOT get the foam in your mouth”.
Questions to ask your children:
1- Does the amount of yeast change the amount of foam produced?
2- Will the experiment work as well if you add the dry yeast without mixing it with water?
3- Does the size of the bottle affect the amount of foam produced?
4- What will happen if we try the activity without the dish soap?
5- What if we try the activity with different container shapes?(use a bottle with a narrower or/and wider neck)