This is a great experiment that i use when teaching my science class.
Step 1: Materials
An empty soda bottle
Measuring table spoon
Step 2: Pour the Peroxide
First, measure 3/4 of a cup of peroxide.
Then pour it into the soda bottle.
Step 3: Food Coloring
If you choose to, add food coloring to the bottle.(10-15 drops).
Step 4: Add Dishsoap
Add about two tablespoons of dish soap to the bottle.
Step 5: Shake It Up
Simply shake the mixture to blend all its contents
Step 6: Add the Yeast
Add about 2.5-3 tablespoons of dry yeast to the empty cup.
Then pour warm water in the cup as well.
Step 7: Mix It Up
Take the small spoon and mix the yeast until it becomes a watery substance like in the picture below.
(Note: I transferred the mixture to a larger cup for easier mixing)
Step 8: Ready for Action
Simply pour the yeast mixture into the soda bottle and watch it erupt.
Make sure to do this outside because it can get messy.
ATTN: The yeast i used was a year old, and was not as active as a new package of yeast would usually be. So in that case it was not as foamy as it should have been. i put a picture of what it usually looks like at the bottom.