AIM:
The objective of the experiment is to release the surplus amounts of oxygen in the hydrogen
peroxide. This is because the sign for it is H2O2 ; the additional two basically means that there is
an additional amount of oxygen in the hydrogen peroxide. The objective is to see how much
foam is produced if you change the amount of the hydrogen peroxide.
RESEARCH:
The hydrogen peroxide we used during the experiment was low grade hydrogen peroxide which
was (3%) concentration, therefore this hydrogen will not create the same amounts of foam,
that other experiments with stronger concentrations, have produced. When hydrogen peroxide
(H2O2) decomposes, it breaks down to form water (H2O) and oxygen (O2). The soap bubbles that
erupt from the cylinder are actually filled with oxygen. As the reaction takes place, you'll also
see steam rising from the erupting foam. This shows that the reaction is exothermic (gives off
heat). This is why out of the three (3) times we did the experiment, we increased the amount
of hydrogen; by doing this , there was a bigger reaction, therefore bigger amounts of foam.
HYPOTHESIS:
I predict that whilst we increase the concentration of the hydrogen peroxide the changes will
drastically improve the final outcome. This is because when you increase the percentile, it
creates a bigger chemical reaction.
VARIABLES:
Independent: The amount if concentration that is applied for the hydrogen peroxide
Dependent: The amount of foam that is produced
Control:
1.
2.
3.
Amount of yeast
Type of plastic bottle
Type of dishwashing liquid
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MATERIALS:
1. A clean 16 ounce plastic soda bottle
2. 1/2 cup 20-volume hydrogen peroxide liquid (20-volume is a 6% solution)
3. Tablespoon (one packet) of dry yeast
4. 3 Tablespoons of warm water
5. 3 drops of dish-washing liquid soap
6. 2 cap full’s of food coloring
7. Small beaker to mix the yeast
8. Safety goggles
9. Lab coat
10. A cake pan to collect the foam when overflowing.
APPARATUS:
1. 16 oz empty plastic soda bottle (preferably with a narrow neck such as those made by CocaCola)
2. 1/2 cup 20-volume hydrogen peroxide (20-volume is 6% solution, purchased from a beauty
supply store)
3. 2 drops of Dawn dish detergent
4. 3-4 drops of food coloring
5. 1 teaspoon yeast dissolved in approximately 2 tablespoons of warm water
6. Meter ruler to measure amount of foam created
7. Glass rod- used to stir, and mix components
8. Lab coat- used for safety from chemicals
PROCEDURE:
Step 1- Stand the bottle up in the center of the cake pan.
Step 2- Put the funnel in the opening.
Step3- Add 3-4 drops of food coloring to the peroxide and pour the peroxide through the funnel
into the bottle.
Step4- Show a water molecule diagram and a peroxide molecule diagram, pointing to the extra
oxygen that will be set free in the reaction.
Step5- Add the Dawn detergent to the peroxide in the bottle.
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Step6- Pour the yeast mixture into the bottle and quickly remove the funnel.
Step7-The students can touch the bottle to feel any changes that take place.
Step8- Change the amount of hydrogen peroxide, during the process. This will show if there is
a significant affect.
EXPERIMETAL SETUP:
Hydrogen
peroxide, main
role in the
chemical
reaction.
Use glass to
mix water and
yeast
Measurin
g cup, use
to hold
yeast,
leave until
time to
mix.
Soap, this helps create
foam. Plays a role in
the chemical reaction.
Bottle – use as holder
of all substances. If
foam amounts
increase, use bowl or
measuring cylinder
to hold overflowing
foam.
Measuring cup, use
to measure amounts
of water, hydrogen,
yeast and soap.
Photo take on Amber’s ipod.
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Scientific Report, Elephant Toothpaste, experimental data.
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If you use all of the correct materials, this is how the experiments should turn out. As you can
observe, the foam is overflowing, this is due to the reaction between the hydrogen and yeast.
SUFFICENCY OF DATA:
Amount of hydrogen peroxide
(ml)
Amount of foam (ml)
100
1,000
150
1, 200
300
2,500
GRAPH:
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Scientific Report, Elephant Toothpaste, experimental data.
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GRAPH ANYLISIS:
The graph shows that the when the amount of hydrogen peroxide increases, the more foam is
created. Each time we increased the amount of hydrogen peroxide, the results changed. When
the amount of hydrogen peroxide was 100, the foam created was 1,000, when the amount
increased by 50 the foam created was 1,200, during the last part of our experiment, when we
had the largest amount of hydrogen (300), the foam levels increased to 2,500. Therefore, the
graph shows these results, and the changes when hydrogen peroxide is increased, and how the
foam is affected by this, and how the millimeters reach higher figures.
CONCLUSION:
In conclusion, when the amount of hydrogen peroxide is increased, the higher the chemical
reaction; amount of foam created. When adding more components to the bottle: such as
hydrogen, soap and hot water, the amount of the foam increased, due to there being more
chemicals, therefore an higher chemical reaction. My hypothesis is correct, because I previously
stated when there is more hydrogen peroxide, there is more of a chemical reaction. This is
shown throughout the graph, data table and procedure. These results prove my hypothesis,
correct.
EVALUATION:
If given a second chance, I would have been more prepared and brought all of the materials on
the first day, this would have given us the change to have more trials, and observe the changes
more carefully. Used measurements more carefully. Also, we could of increased the amounts of
water and soap, observed if it changed the chemical reaction, then we could conclude that
hydrogen is the main trigger, in this reaction; therefore there would be a more precisely
written, conclusion.
Source of Error
Measurements
Amounts of water
Amounts of soap
Improvements
More precisely done/ measurements specific,
and properly used throughout experiment/
with materials.
Could have seen if this changed the
outcome/chemical reaction.
Could have seen if the amount of soap
changed the results, created a stronger
chemical reaction.
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SAFETY PRECAUTIONS:
1. Wear safety goggles- protect eyes from dangerous chemicals.
2. Lab coat- prevent chemicals; having contact with skin.
3. Gloves- dyes, chemicals and equipments can hurt you, protect your hands.
SOURCES:
http://www.sciencebob.com/index.php
©2012 sciencebob.com
http://labwareexpert.com/glass-stirring-rods-5835cm-p-39.html
Copyright © 2012 labwareexpert.com.
http://www.stevespanglerscience.com/experiment/hydrogen-peroxide-eruption
© 2012 Steve Spangler Science
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Scientific Report, Elephant Toothpaste, experimental data.
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