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Potato and Hydrogen peroxide Investigation

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Background information: I'm going to drop a piece of potato into Hydrogen peroxide and examine the rate of reaction while changing the surface area of the same size potato. Hydrogen peroxide is made during some reactions in cells. It is an oxidizing agent so it will damage the cell that is making it. It slowly decomposes into water and oxygen. 2H O 2H O + O Hydrogen peroxide Water + Oxygen An enzyme called catalase is in living cells, which helps speed up this reaction. If you put bits of potato or liver into hydrogen peroxide the mixture fizzes as oxygen is released. This happens inside the hydrogen peroxide where the catalase enzymes meet or collide together. The potato cells have to be in the hydrogen peroxide for the enzymes to work on the reaction. All this is relevant to the Collision Theory: The speed of reaction can increase if the molecules reacting collide or move faster. Here are some ways that the reaction time can fasten. Temperature: Increasing the temperature causes the speeding up of particles (in liquids and gases). ...read more.


3. I purred some water in the test tube and set up the delivery tube and bung. 4. I dropped the first 4cm potato and quickly put on the bung. 5. I shock the tube once and started taking the time. 6. I started counting after the first bubble. 7. When the 15th bubbles came out I stopped the time and written the results. 8. For the next one I got the next tube with 20ml of hydrogen peroxide and did the whole process again with 4, 8 and 16 pieces of potato. Safety: To keep safe in this experiment you shouldn't: ==> Keep your head or eyes too close to the hydrogen peroxide. ==> Wear goggles when using hydrogen peroxide. ==> Put your hand behind the potato while cutting it with borer. Fair test: For making this test a fair one we will have to keep these measurements the same: ==> The amount of hydrogen peroxide. (20ml) ==> The size of the potato chip. (4cm) ==> The volume or the amount of the bubbles. (0.8cm�) Or (15 bubbles) ...read more.


The concentration of hydrogen peroxide could be increased to fasten the experiment. Evaluation: The results from this experiment are quite reliable, except the fact that some inaccuracy may have happened during the experiment. This could affect the graph and change the results. I had some problems during the experiment, chopping the potatoes, especially when I had to chop it into 16 pieces. I think the last one that we did was a bit unreliable, as you could see in the graph, all the other ones are in quite a straight line and the last one is out of the rhythm. I think this is because the cutting of the potato in cross sections wasn't done properly, as you could see in the picture below: At the 1st and the 2nd time on the graph I came up with the wrong results, which I highlighted with red and excluded them from the average. This was because the potatoes I used were not cut fresh. They were cut and left aside for the other experiments, therefore the catalase around the outside of the potato was damaged and this caused the reaction to slow down. This could be improved by cutting the potato chips fresh. ?? ?? ?? ?? 1 Science Investigation Farid Froghi 10Q Mr Patton ...read more.

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