ELEPHANT’S TOOTHPASTE
EXPERIMENT!
2H2O2 +
Yeast
Hydrogen Peroxide
2H2O + O2

Water + Oxygen gas
PROCEDURES
1. Pour the 50ml of lukewarm water into the 150ml beaker of yeast. Mix together for about 30 sec.
and set aside.
2. Pour 100ml of Hydrogen Peroxide into the flask.
3. Pour the cup of dish soap into the flask.
4. Put on your googles and carefully (and quickly) pour the yeast water mix into the flask
5. Observe what happens, and ANSWER THE QUESTION BELOW!
Question for 9th graders ONLY:
Which one of the following is a lab safety precaution?
(Circle the correct answer)
Goggles or a table
Question for 10th, 11th and12th graders ONLY:
Was this experiment an example of a chemical change or physical change?
(Look at formula above)
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