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How varying surface area affect rate of reaction - plan

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Aim: The aim of this investigation is to investigate how varying surface area affects the rate of reaction (amount of Oxygen produced). The hypothesis being tested is 'an increase in the catalyses surface area causes the rate of Oxygen production to increase (rate of reaction).' In order to test this hypothesis, the substrate Hydrogen Peroxide and enzyme catalase in potato will be used. The substrate concentration will be kept constant whilst, the catalyses surface area will be varied, by changing the surface area of the potatoes. The rate of reaction used can be represented by measuring the volume of oxygen produced in a fixed period of time. Prediction: I predict that an increase in surface area of potato, whilst the hydrogen peroxide concentration is kept constant will result in an increase in the amount of oxygen produced. The scientific reasoning behind the prediction is, as the surface area of the solid increases there is more solid available for the enzyme to react with, therefore causing an increase in the rate of reaction. ...read more.


of decomposition is dependent on the temperature and concentration of the peroxide, as well as the pH and the presence of impurities and stabilizers. From further research I have found out that a reaction occurs on a solid's surface. Therefore the particles inside the solids will not react until the particles on the surface have reacted and moved away. So, the longer catalyse is kept in the hydrogen peroxide, the more oxygen produced, as there are more collisions of particles. Based on these reasons I predict that as the number of 1cm� cubes increases, there will be more fruitful collisions resulting in a faster rate of reaction. However, as time increases the reaction on each surface area will start to slow down. Enzymes are a particular kind of protein that have the ability to catalyze reactions in living organisms. Proteins are very long chain molecules made up of amino acid building blocks. ...read more.


Catalase is also used in the textile industry, removing hydrogen peroxide from fabrics to make sure the material is peroxide free. A minor use is in contact lens hygiene, some lens cleaning systems sterilize the lenses by soaking them in a hydrogen peroxide solution, and catalase is used to decompose the peroxide before reinserting the lenses in the eye. Catalase is an enzyme present in living cells. Potatoes are going to be used as they contain catalase enzyme, within their cells. The substrate on which the catalyse shall work on is Hydrogen Peroxide producing oxygen and water. Factors: The Rate at which a chemical reaction takes place can be affected by certain factors: * Concentration of reactant: If the concentration of any reactant in a solution is increased, the rate of reaction is increased. This is as increasing concentration increases the number of successful collisions between the substrate and solid. So above it can be seen that Fig 1.2 has more concentrated acid particles than Fig 1.1 so there is more fruitful collisions resulting in an increase in the speed of product formation. ...read more.

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