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Experiment to find the effect of temperature on rates of reaction

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CHEMISTRY G.C.S.E COURSEWORK Experiment to find the effect of temperature on rates of reaction I would like to find out the effect temperature has on the speed of a reaction. In order to do this, I plan to react 20mm X 5mm strips of magnesium with 20cm� of 1.5Molar hydrochloric acid. In the experiment, I will time how long it takes for the strip of magnesium to fully dissolve at different temperatures. List of Equipment 1. 20cm� measuring cylinder 2. 1.5M diluted hydrochloric acid 3. 10 X 2cm strips of magnesium 4. 1 test tube 5. Test tube holder 6. Bunsen burner 7. Tripod 8. Gauze 9. Heat mat 10. Water bath 11. Crushed ice 12. goggles 13. Thermometer Method 1. First I will assemble the apparatus as shown in the diagram. While doing this I have to secure any loose items such as my tie for safety reasons. Also I have to wear goggles throughout the experiment because of the dangerous nature of Hydrochloric acid. 2. Next, I have to measure the temperature of the acid carefully, looking at the thermometer at eye level to make sure it is an accurate reading. To adjust the temperature I will use crushed ice to lower the temperature and use a Bunsen burner to raise the temperature. ...read more.


This is linked with the collision theory that states that for a successful reaction the particles must collide with enough energy (activation energy) to break bonds and that the collision must be of the correct orientation and not just glancing. By creating a rise in temperature, you are increasing the speed of the particles. And so the particles are moving around faster, and so are more likely to collide on target and with enough energy. It has been proved that a simple 100C rise in temperature changes the speed of the particles and raises the amount of particles that have the necessary activation energy, as shown in this Bolzman distribution curve. There are a couple of reasons this experiment may not achieve the results I expect. First, if the experiment is not kept in a constant environment, should the room in which it is kept is warm one day, and cold the next time I do the experiment it could affect the results. Within the experiment itself, even minute alterations in the length of Mg or the temperature of the HCl could have a large impact on the results. Both of these reasons mean that the experiment is not a fair one, therefore the results are unreliable. ...read more.


For instance, if you look at points E1 and E2 on the graph above, you would see that they have only a 0.01 point difference (3 points). Also on this graph, the furthest a point is from the line of best fit is 0.05 away (13 points). All of this proves that this experiment has very accurate results. In my experiment, I had in fact planned to repeat each experiment three times. However, once I had repeated each one twice, I realised that the results were coming fairly consistently and so I had no need to repeat it a third time. If I were to do this experiment again I would have amended my method, and done each temperature with two test tubes at the same time. This would minimise the difference in result, and made sure both were done at the same temperature with no chance of error. Also, if I had the resources I would have replaced a couple of the instruments I used, for example: => I would have replaced the analogue thermometer I used, with a digital thermometer which would have been easier to read from, making sure I got the perfect temperature each time. => I would have replaced the measuring cylinder I used with a mouth pipette because it is more accurate, and so would make sure I got the right amount of HCl each time. => => => => ?? ?? ?? ?? 1 1 ...read more.

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