Rates of Reaction Coursework - Hydrogen Peroxide and Catalase.
In this investigation I will be trying to find out if the rate of a reaction changes if the concentration of the substance is altered. This will happen if the Hydrogen peroxide is decompostured. .
Hydrogen peroxide (H202) is a clear poisonous liquid, which is produced during respiration. If this builds up inside the body it can kill, so an enzyme called CATALASE stops this from happening by breaking down the build up. More about Hydrogen Peroxide will be explained in my knowledge. The decomposition of Hydrogen peroxide looks like this:.
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2H2 O2 Catalase 2H2O+02.
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Prediction.
I think that the higher the concentration of Hydrogen Peroxide, the more bubbles will come out. The purer the Hydrogen Peroxide, the quicker the reaction rate. Because I am going to change the concentration of Hydrogen Peroxide after each experiment, I think that fewer bubbles will come out. This is because there will be less Hydrogen Peroxide in the beaker so there will be less to decompose.
I also think that if I double the Concentration, I will see twice the number of bubbles, and if I divide the Concentration by 2, I expect to see half the number of bubbles (e.g.-Concentration 2 molar, 36 bubbles, Concentration 1 molar, 18 bubbles). This can be seen in the graph below.
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My Knowledge.
Reactions happen all the time all around us e.g. a balloon bursting, a cake baking, an apple ripening and lighting a fire. Some of them are very slow, while some are very fast. Different reactions have different rates. The rate of a chemical reaction is the speed or time taken for it to happen.
The majority of chemical reactions are faster when the concentration is.
higher. This is because at a higher concentration, the molecules in a substance have more kinetic energy, which means they will move around quicker. This makes it easier for them to react together.
