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Elephant's Toothpaste - Kid Version

A kid-safe version of the classic Elephant's Toothpaste

Elephant's Toothpaste - Kid Version

This is a kid-safe version of the popular Elephant's Toothpaste demonstration using common household materials. A child with a great adult helper can safely do this activity and the results are wonderful.

Materials

  • 16 oz empty plastic soda bottle (preferably with a narrow neck such as those made by Coca-Cola)
  • 1/2 cup 20-volume hydrogen peroxide (20-volume is 6% solution, purchased from a beauty supply store)
  • Squirt of Dawn dish detergent
  • 3-4 drops of food coloring
  • 1 teaspoon yeast dissolved in approximately 2 tablespoons very warm water
  • Funnel
  • Foil cake pan with 2-inch sides
  • Safety glasses
  • Lab smock
  1. Have students put on their safety glasses and lab smock.  Each student should have in front of them a cake pan, plastic bottle, Dawn in small cup, food coloring, 1/2 cup peroxide, and the dissolved yeast mixture.
  2. Stand the bottle up in the center of the cake pan. Put the funnel in the opening. Add 3-4 drops of food coloring to the peroxide and pour the peroxide through the funnel into the bottle. Show a water molecule diagram and a peroxide molecule diagram, pointing to the extra oxygen that will be set free in the reaction.
  3. Add the Dawn detergent to the peroxide in the bottle.
  4. Pour the yeast mixture into the bottle and quickly remove the funnel.
  5. The students can touch the bottle to feel any changes that take place.

Observations

The reaction creates foam that shoots up out of the bottle and pools in the pan. After a minute or so, it begins to come out in a moving stream that looks like toothpaste being squeezed out of a tube. The students can play with the foam as it is just soap and water with oxygen bubbles. The bottle will feel warm to the touch as this is an exothermic reaction.

How does it work?

Talk about the addition of the yeast as a catalyst, which makes the peroxide molecule release the oxygen atom faster. The teacher who submitted this experiment claims to have done this with hundreds of students from kindergarten through fifth grade and some adults who all loved the experiment. It is very easy and safe to do again at home using regular hydrogen peroxide from the drugstore.

    Click the thumbnail below to see the video.

  • Monster Foam
    July 4th, 2011

great experiment!!

jerianne    -  November 2, 2011

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This user gave 5/5 stars


I did it with 3% too, not as great as a reaction, but still good enuf!! Thanx!!!

doing it today semptember 6 2011

amaris    -  September 6, 2011

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This user gave 5/5 stars


this was really awesome i mean it is awesome it is better when you have a big soda bottle

Big mess, big fun!

hollyml    -  March 23, 2011

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This user gave 5/5 stars


I did this experiment with 20 fourth-graders at a birthday party, and they thought it was very cool. Rather than give each kid a cake pan, we just had them all sit around the edges of a big plastic sheet on the ground, and let the foam spill out on that. They enjoyed playing with it and most of the mess was cleared away simply by picking up the plastic sheet.

Instead of supplying 20 funnels, we dissolved the (pre-measured) yeast in little paper cups (the kind meant to hold candy party favors), using popsicle sticks to stir. The kids were able to pour the contents of the little cup right into the bottle by pinching the edge of the cup to form a spout.

We used drugstore hydrogen peroxide (3%) which results in a less dramatic eruption than the higher-strength stuff, but it does work. I could not find a source for more concentrated solution, other than "food grade" which can be ordered online but was expensive and would have taken too long to ship to me. I even bought a jug of what claimed to be 29% H2O2 from a local hydroponics supply store, but it did not work -- when we tested it foamed only a little, not even enough to reach the top of the bottle. Although my science-teacher friends were happy to speculate, nobody could tell me for sure why it didn't work. (I guess I'll use the rest of the jug for cleaning something...)

Ah well, at least the 3% drugstore version is cheap! Which is good, given that I needed a lot of it. And the effect was impressive enough for this group of kids.

Loads of Fun!

Phill Arizona   -  January 11, 2010

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This user gave 5/5 stars


I did this experiment with my daughter, and she loved it. It's fun to do and it works really well. Plus, kids get to play around with the sudsy water at the end.

WOW!!

Kikikomo Hikirombo U.S.A.   -  October 15, 2009

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This user gave 5/5 stars


this is an expirement that id did as a kid.

elephant's toothpaste

sdearman texas   -  October 15, 2009

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This user gave 5/5 stars


My 2nd grader performed this at his school for "nutty professor" day. It was very cool!

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