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To Investigate One Factor That Will Affect the Rate of Decomposition of Hydrogen Peroxide.

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INVESTIGATION OF THE Aim: to investigate one factor that will affect the rate of decomposition of hydrogen peroxide. The equation for this reaction is;~ Hydrogen peroxide -----------------------> oxygen + water 2H O -----------------------> O + 2H O Rate of reaction means the time in which the reaction takes place. Key factors that may affect this reaction are temperature, pressure, surface area, light, concentration, type of catalyst or amount of catalyst. The factor that I will investigate, will be the amount of catalyst. Prediction: I predict that when the catalyst (Maganese IV Oxide) is added to the hydrogen peroxide, small bubbles of oxygen will appear in seconds. They will then collect in the gas syringe, therefore making it expand. If I were to double the amount of catalyst then the rate of reaction would also double as a result. Hypothesis: The theory behind my prediction is that the catalyst decomposes the hydrogen peroxide at a faster rate than if the catalyst was not added at all. ...read more.


Next I will measure 5cm of hydrogen peroxide, using the pipette I will squeeze it into the measuring cylinder. Making sure that the cylinder is flat on the lab bench to ensure that the readings are precise. I will then measure x amount of catalyst on the balance. I will then take the bung from the beaker, pour in the hydrogen peroxide and add the catalyst. Immediately I will replace the bung and start the stop clock. I will then record the reading of oxygen in the syringe every 15 seconds, until the reaction has stopped. In between these readings I will twist the syringe gently to prevent sticking. I will use these different amounts of catalyst; 0.1g 0.2g 0.3g 0.4g 0.5g I will also rinse the beaker out after each experiment, and make sure that it is completely dry, before the next experiment. I will repeat each experiment twice. Risk assessment: It is important that I wear goggles throughout each experiment as a safety precaution, so that I do get any chemicals into my eyes. ...read more.


This would have also probably prevented any anomalous results that I gained. As they were not I have considered that there may have been a change in temperature which could have distorted my results. To improve my method could measure the room temperature a make sure that it remained the same throughout the experiment. Otherwise I would consider my method as being accurate and quite a sound method to use again if necessary. This is the only change I would make to my method. I feel that my results are a good source to prove my hypothesis as the reaction of the hydrogen peroxide does speed up due to the catalyst. I feel that they could be made more reliable if I have controlled the environment further by keeping the temperature the same. Another experiment that I could do to back up my conclusions would be to measure the volume of gas by collection over water. I would do this with a measuring cylinder (to collect the oxygen), a trough filled with water, an airtight beaker and a delivery tube to connect the two. See Diagram below............ ?? ?? ?? ?? Elisabeth Padberg 10BR Elisabeth Padberg 10BR Elisabeth Padberg 10BR ...read more.

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