Transcript Elephant Toothpaste.docxx

Elephant Toothpaste
By: Ashley Morgan
Purpose
• The purpose of this lab was to mix two
solutions together and form a foam fountain.
• When performing this experiment, just by
changing one material can give you similar
results.
Funnel
• A tube or pipe that is wide at the top and
narrow at the bottom.
• It is used for guiding a liquid into a small
opening.
Catalyst
• A catalyst is a substance that increases the
rate of a chemical reaction without
undergoing any permanent chemical change.
• In simpler words:
– Helps a reaction happen faster
– Yeast
– Potassium Iodide
Exothermic
• Releases heat and causes the termperature of
the immeidate surroundings to rise.
Procedure #1
• In a 16 oz bottle mix
– 8 drops of food coloring
– 1 tablespoon of dish soap (dawn)
– ½ a cup of 3% hydrogen peroxide
– 3 tablespoons of water
– 1 packet of dry yeast (red star)
– Watch reaction
Reaction!
Observations
• Hydrogen peroxide molecules are very
unstable and naturally decompose into water
& oxygen gas.
Hydrogen Peroxide ->
Water ->
Oxygen
2H2O2
2H2O
O2
Observations
• The yeast acted as a catalyst to remove the
oxygen from the hydrogen peroxide.
– Since it did this very fast, it created lots of
bubbles!
• This solution had a scent of freshly baked
homemade bread.
• Each tiny foam bubble is filled with oxygen.
Observations
• The food coloring changed the foam to a redyellow color.
• The experiment created a reaction called an
exothermic reaction.
– That means it not only created foam but also heat
as well.
– It also created bubbles, which is a gas.
Question #1
• Why is warm water best to use in this
experiment?
– Warm water is best for yeast because yeast is a
living organism that likes to live in similar
temperatures to humants
– Put the yeast in hot water and it dies
– Put the yeast in cold water and it will be too cold
to reproduce.
What is actually happening?
• Hydrogen peroide is water with one extra
oxygen.
• When yeast is added, it acts as a catalyst to
split the hydrogen peroxide into water &
oxygen.
• Bubbles of oxygen are trapped in the soap,
which transforms into the foam fountain.
• The product formed is just soap, water, and
oxygen.
Procedure #2
• Mix in a 16 oz bottle
– 40 ml of dish soap (dawn)
– 80ml of 3% hydrogen peroxide
– 1 tablespoon of potassium iodide
– 8 drops of food coloring
– 3 tablespoons of warm water
– Watch reaction
Reaction!
Observations
• The overall equation for this reaction is:
2H2O2
2H2O (liquid)
O2 (gas)
• The dishwashing detergent captures the
oxygen as bubbles.
• Food coloring changed the foam to a bluegreen color.
Observations
• This had a soapy scent of apples due to the
dishwashing soap.
• The experiment created an exothermic
reaction as well.
– The bottle was warm as well.
– Bubbles were produced.
Similarities
Differences
• The both started
• Scents
producing foam right
– Apples
away once the
– Bread
hydrogen peroxide was • Potassium Iodide
added.
experiment looked
• The bottles was warm.
watery rather than
bubbly
• Bubbles were produced.
Conclusion
• This experiment used hydrogen peroxide and
potassium idodie/yeast mixed with dish soap and
water.
• If you add all these together, the hydrogen
peroxide’s decomposion is sped up the catalyst.
• Oxygen is given off and forms foam with the dish
soap.
• The foam pushes up in the bottle and comes out
the top looking like toothpaste.
Works Cited
• http://www.using-hydrogen-peroxide.com/elephant-toothpaste.html
• http://chemistry.about.com/od/chemistrydemonstrations/a/elephanttoot
h.htm
• http://www.sciencebob.com/experiments/toothpaste.php
• http://www.wikihow.com/Make-Elephant-Toothpaste