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Investigation into Rates of Reaction when Concentration is changed.

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Introduction

INVESTIGATION INTO RATES OF REACTION WHEN CONCENTRATION IS CHANGED In this investigation, I will try to work out what concentration a reaction takes place in fastest; a highly concentrated solution or a highly dilute solution. 2H2O2 2H2O + O2 In this experiment we need to use Hydrogen Peroxide, a chemical in a liquid state which is similar in structure to water (Hydrogen Peroxide being H2O2, just one more oxygen atom than a water molecule). Hydrogen Peroxide normally decomposes very slowly over a long period of time; however, when added with Manganese Oxide whilst the Hydrogen Peroxide is in air or water, the reaction instantly speeds up. The reaction is based upon the collision theory; the rate of reaction depends on how often and how hard collisions of particles take place. The catalyst works by providing a surface which the reacting particles can stick on to. They can then collide easier with each other once they are on or going toward the surface. Enzymes are the catalyst of all living beings, as they are produced in living things. Enzymes help chemical processes in a living organism happen faster, and a way to speed them up with the enzyme is by raising the temperature of the body. ...read more.

Middle

To do this experiment, I will measure out the Hydrogen Peroxide and Water in each of the small measuring cylinders. Then I'll fill the container until just over the half mark with water. I shall then place the lead oxide, whilst on the paper on top of the scales and measure out 5cm of it. Then, I will add the Lead Oxide, Hydrogen Peroxide and Water together into the conical flask, put the delivery tube on top and put the end of the tube into the water. Then I'll put the Eudiometer tube, filled with water, upside down into the water and over the end of the glass tube. As soon as that's done, I'll see how much oxygen is collected in one minute. When I have added the solutions together, I will shake the conical flask slightly so that the particles can move. To keep this experiment being a fair test, I shall keep the amount of Lead Oxide the same, I will only raise up the amount of water by 10cm every time as well as reducing the amount of Hydrogen Peroxide by 10cm every time. I shall also use the same size measuring cylinders to measure the substances, and I will try to keep the amount of water in the Eudiometer Tube the same. ...read more.

Conclusion

Next time I do this experiment, I would change the amount of Hydrogen Peroxide to reduce and Water to increase by 5cm , not 10 . I would also get properly marked measuring cylinders and Eudiometer tube. I would also try even more to keep the temperature the same, as we were working next to people using Bunsen burners. All my results in the first experiment were correspondent with the repeated experiments results, so at least they were all around the same number. The only result that wasn't 'in line' was the first result of the second experiment, as the second experiments' results were slightly higher than the first experiments' apart from that one. To extend and improve this experiment, I could do a number of things. These include changing Lead Oxide to a different catalyst or maybe the same catalyst but in a pellet or gauze form, just to show a varied result. Also, I could change the experiment slightly by using a gas syringe connected to the delivery tube, so then there would be no need for the Eudiometer tube and the large container filled with water. The gas syringe would also help in accuracy, as it is already marked and has the same volume all around (the end of the Eudiometer tube is rounded and may affect the volume of Oxygen evolved being shown). ...read more.

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