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1. Enzymes are proteins, such as catalase, that act as a natural catalyst that speed up reactions between an enzyme and a product, known as a substrate.
2. When hydrogen peroxide was added to the liver in Test Tube B, the catalase split the hydrogen peroxide into oxygen gas and water.
3. It causes a small flame, which is due to the oxygen gas being trapped in the bubbles, and it sets the oxygen on fire.
4. The temperature, if it is do high or cold, will denature the enzymes, proven in Test Tube E.

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http://bit.ly/qJ1c51

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As believed, the catalase did break down the hydrogen peroxide into oxygen and water, and when the resulting "foam" was lit with a match it ignited, proving the presence of oxygen. As proven by Test Tube E, when the liver containing the enzyme was heated to a certain point, the enzyme denatured and the reaction did not occur.

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I believe that the enzyme, catalase, which is found in liver will break down the hydrogen peroxide into oxygen and water, until a certain temperature or pH at which point the enzyme will denature.

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Click on For Larger Image

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In Order from left to right:
A, B, C, D, E

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Step 1:
Take 5 Identical Test Tubes and add 2 cm of water to two of them and add 2 cm of hydrogen peroxide to the other three.
Step 2:
Put a piece of liver into each test tube, except Test Tube C
Step 3:
Take Test Tube E and boil it.
Step 4:
Test Tube B and D should react, giving off oxygen, which is flammable, and water.
Step 5:
Light the Wooden Splint and let it burn out until red ashes remain, and then touch it to Test Tube B, C and D. Test Tube C should not react, but B and D should.
Step 6:
Add Hydrogen Peroxide to Test Tube E, and follow the instructions given in Step 5.
Step 7:
Record Results

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Water
Liver
Test Tubes- 5
Hydrogen Peroxide
Wooden Splint
Match

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Will the liver break down the hydrogen peroxide into both Oxygen and Water, O₂ and H₂O?

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The effect of hydrogen peroxide on catalase, an enzyme found in the liver that breaks down hydrogen peroxide.