Immersion - elephants toothpaste

On Wednesday for immersion we got into pairs and grabbed a water bottle and walked down to the kitchen to make elephants toothpaste. We got  all the ingredients and started following the recipe. First we had to pour the hydrogen peroxide into the bottle. Then we added 8 drops of food colouring  I then added a teaspoon of liquid dish soap into the bottle. Then I shook the bottle around a little bit to mix it. Then we got a another small cup, and combined the warm water and the yeast together and we mixed it for about 25-30 seconds. Then we poured the yeast mixture into the bottle. It worked it was foaming right out of the bottle. I think that it was a chemical reaction because the carbon peroxide and yeast mixed with it and then it started to foam.