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Investigation of a Factor Affecting the Rate of Hydrogen Peroxide Decomposition

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Introduction

SACE Stage 2 Chemistry Design Practical: Reaction Rates Investigation of a Factor Affecting the Rate of Hydrogen Peroxide Decomposition. 1. Design Aim: To determine how the rate of decomposition of hydrogen peroxide will change with a change in concentration of hydrogen peroxide. Hypothesis: If the concentration is increased then the rate of decomposition should increase. This is because an increase in the concentration will cause more frequent collisions. An increase in collision frequency will result in more frequent formation of products. As when the concentration of hydrogen peroxide increases there will be more hydrogen peroxide molecules in the same amount of volume causing a higher frequency of collision leading to a faster rate of reaction. Variables: Independent: Concentration of hydrogen peroxide Dependant: The time taken to form a certain amount of products. Controlled: � Amount of catalyst if this is changed the rate of the reaction will change as well. � Amount of hydrogen peroxide as it is the concentration that is changing not the amount of hydrogen peroxide. � Temperature as a change in the temperature will change the rate of the reaction. � Environmental surroundings kept constant otherwise external changes may alter the results. ...read more.

Middle

All of this should be done in as short a time as possible to prevent inaccuracies in the readings. 9. Stop the timing when 40 mL of gas has been collected. Record the time that this takes. 10. Repeat Steps 2-8 using 2mL more of hydrogen peroxide and 2mL less of distilled water each time until the mixture is completely hydrogen peroxide. Make sure that the temperature and the amount of the catalyst remain the same throughout the experiment. 2. Presentation: Results: Table 1: Time taken for 40mL of gas to be collected when changing the concentration of hydrogen peroxide. H2O2 (mL �0.05mL) H2O (mL �0.05mL) Time (s �0.5s) 1/Time (s-1 �0.5s) 2 8 84.80 0.01179 4 6 46.27 0.02161 6 4 37.37 0.02676 8 2 24.38 0.04101 10 0 24.19 0.04134 3. Conclusion and Evaluation: Discussion: The first graph has a fairly high R2 value of 0.9537. However, a couple of he points on the graph are a fair way out from the line of best fit suggesting some random error in these points. Random error in these points could have been caused by human error. The second graph suggests a large systematic error. Because although the points are fairly close to the line, suggesting they are reasonably precise, the graph does not pass through the origin like it should suggesting a systematic error. ...read more.

Conclusion

This was because some of the manganese oxide would stay on the watch glass and due to its shape it made it difficult to make sure that all of it has gone into the mixture. Because the amount of catalyst was very small loosing some of it could have made a very large difference to the results obtained. This problem could have been fixed by using a funnel to convert all of the catalyst from the measuring apparatus to the hydrogen peroxide. Another problem was with the time delay of putting the stopper into the top of the flask after the catalyst had been added. This time delay meant that some of the gas might have been able to escape thus changing the results. The time delay between this could have been minimised by using a conical flask that had a hole in the side of it that could be covered so that the stopper could already be in and then the catalyst could be put in and the hole covered immediately after. This process would be a lot less difficult as it is a lot easier to place the cover over the hole than it is to put on the stopper whilst making sure that the tube does not come out of the inverted measuring cylinder. SACE Stage 2 Chemistry Design Practical Jess Goodchild ...read more.

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