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Investigation To See The Effects Of Increasing The Surface Area Of A Potato When Mixed With Hydrogen Peroxide.

2007 words - 8 pages

In my coursework I will investigate about enzymes in potatoes reacting with Hydrogen Peroxide. In particular I will investigate the effects of changing the surface area of a potato when added to Hydrogen Peroxide. This is because, when increasing the surface area of the potatoes it will increase the rate of reaction because there will be more surface area on which particles from the potato and the Hydrogen Peroxide will collide on, and with more surface area there would be more particles carrying kinetic energy, and by carrying more kinetic energy the chance of the reaction to reach its activation energy is more higher and therefore creates more successful collisions and by making more successful collisions the speed of the reaction is increased.Prediction: Therefore I predict that the crushed potatoes would produce 4.5cm3 of bubbles under the time of 3 minutes, which will be quicker than the not crushed potatoes because increasing the surface area of the potato would increase the rate of reaction and therefore increase the amount of oxygen being produced in the form of bubbles, which will fill up the test tube in the crushed potatoes more quicker.In my experiment Hydrogen Peroxide is being used as a reactant with the potato, with an unstable structure the Hydrogen Peroxide will be changed after the reaction with a substance called catalyse which can break it down into oxygen and water which is a more sustainable, as shown:Hydrogen peroxide Water + oxygen2H2O2 2H2O + O2And with oxygen being produced in the form of bubbles, I can then read off the amount of oxygen being produced during the reaction through the height of the froth.Enzymes such as catalyse are protein molecules, which are found in living cells of potatoes. They are used to speed up specific reactions in the cells by reacting particles gathered on the catalyst surface and1) collide more frequently with each other,2) more of the collisions result in a reaction between particlesbecause the catalyst can lower the activation energy for the reaction. Although they are all very specific, as each enzyme just performs one particular reaction, this is used for removing Hydrogen Peroxide from the cells which can be done with the help of Catalyse, which can speeds up the decomposition of Hydrogen Peroxide into water and oxygen. It is able to speed up the decomposition of Hydrogen Peroxide because of the shape of the Hydrogen Peroxide molecule, which follows a method called lock and key where Hydrogen Peroxide molecule can fit into an active site within the potato, which makes the chemical reaction. This type of reaction where a molecule is broken down into smaller pieces is called an anabolic reaction. This reaction can be therefore speeded up through the rate of reaction.The rate of a reaction depends on two factors.1) The number of collision per unit time between the reacting species.2) The fraction of these collisions those are successful in producing a mew molecule and can be increased...

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