Experiment to investigate reaction.

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                        Experiment to investigate reaction

                                                                Catalase                

Aim: I want to find out what will speed up the reaction H2O2→O2+2H20.

Factors: The factors of my experiment which could affect what happens in my investigation are; Temperature, amount of potato catalase, amount of concentration of hydrogen peroxide, time, amount of fairy liquid used and sunlight or darkness.

The investigation: In order to make sure it is a fair test I am only going to change one factor which is the amount of potato catalase used. I will keep all the other factors the same in each test tube.

My prediction: In my investigation I think the rate of reaction will increase the more potato catalase used. I think this because of my scientific knowledge of how an enzyme works and how reactions speed up. In order to explain this to you I will use the lock and key theory and the collision theory as examples. The lock and key theory is when sufficient subtrate locks into the active site then splits into two separate compounds. E.g. potato catalase splits hydrogen peroxide into two separate compounds. The collision theory is when particles have sufficient energy to collide together and react, the minimum amount of energy needed is known as the activation energy. I used both of these theories in order to describe what I think will happen.

Below I have drawn a diagram in order to show what I mean:

The books which I used for my research into my prediction are biology for AQA and chemistry for AQA. I also researched on the internet. Here is a screenshot.

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Apparatus: The equipment which I will use are; 5 test tubes, a test tube rack, borer to cut the chips the same shape, weighing scales, stopwatch a measuring cylinder and a pipette.

Preliminary work: For my preliminary work I tested 4 different weights of potato and used 10cm³ of hydrogen peroxide solution. We then put 2 drops of fairy liquid inside each test tube which had the potato chips (0.7g, 1.5g, 3g, 4g, 5g,) in each solution. Then timed it for 5 minutes. Because of our preliminary work ...

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