Investigating Factors Affecting the Rate of the Decomposition of Hydrogen Peroxide

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Investigating Factors Affecting the Rate of the Decomposition of Hydrogen Peroxide

Aim: To see how the rate of the decomposition of Hydrogen Peroxide is

affected by the concentration of Hydrogen Peroxide.

[IMAGE]Prediction: I know that Hydrogen Peroxide is unstable and

gradually breaks down into water and oxygen over time. The equation

for this reaction is 2H2O2*(aq) 2H2O (l) + O2 (g).

I think that the higher the concentration, the faster the rate of

reaction will be. I think this because the higher the concentration,

the more atoms there are, then there are more chickens and therefore

there are more collisions as a direct result of the concentration.

This is based on the Collision theory, which states that if there are

more atoms, there are more collisions, therefore it is more likely to

reach the activation energy level required to have a reaction.

This likelihood is improved by the fact that there are catalysts

(Manganese (IV) Oxide) involved in the equation. Catalysts lower the

activation energy requirement, thus increasing the chance of a


My preliminary results show me that the higher the volume of Hydrogen

Peroxide, the faster the rate is. Also that the higher the amount of

catalyst, the faster the reaction. The lower the particle area the

faster the reaction. The higher the temperature the faster the

reaction. Also the more concentration, the faster the reaction.

Method: Set up apparatus as below:


I will be measuring the amount of oxygen that is released by the

solution by reading from the syringe every 15 seconds for 5 minutes.

Then I shall draw the results on a graph. The gradient of the graph

will show me the speed of the reaction.

Fair Test:As mentioned earlier, many things can speed up/slow down the

rate of this reaction. Therefore, in order to have a fair test, I

shall have to be careful of all my key variables. Between observations

all I will alter is the concentration of the Hydrogen Peroxide. This

means that the volume, amount of catalyst, particle area and
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