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How does temperature affect the rate of a reaction?

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Lucy Gillett How does temperature affect the rate of a reaction? What am I trying to find out? In this investigation I am trying to find out if and how temperature affects the rate of reaction between magnesium ribbon and hydrochloric acid. What am I going to do? * I will firstly collect all of the equipment. * I will then put 20cm of acid into the boiling tube. * I will then place the boiling tube into the water bath and allow the water to reach the desired temperature. * I will then place 2cm of magnesium ribbon into the 20cm of 1.0 moldm-3 of acid, as I do this I will start the stop watch. * Once the magnesium has reacted I will then stop the stopwatch and record the time. * I will then repeat this experiment so that I can get an average. * Once I have done that I will repeat the experiment for all of the 6 temperatures. Which are: 10�C, 20�C, 30�C, 40�C, 50�C and 60�C. What do I think will happen? I think that the higher temperature will increase the rate of reaction. So the higher the temperature, the faster the rate of reaction. I think this because of the following: The rate of reaction is the speed or velocity at which a chemical reaction precedes, expressed in ...read more.


Which variables am I changing? There are many variables which can be changed in some way to effect the reaction, I have chosen to change the temperature. I have chosen 6 different temperatures to complete the experiment with, and hope that these temperatures will show a pattern into the increase of temperature and rate of reaction. My temperatures are: 10�C, 20�C, 30�C, 40�C, 50�C and 60�C. I found when choosing my temperatures there were two limits these being 0�C and 100�C, as at 0�C the solution would freeze and at 100�C the solution would evaporate. Which variable am I going to measure? I will be measuring the rate of reaction. This being how long it that's for magnesium to react with hydrochloric acid. I will be measuring in seconds. Bibliography To complete my planning I used a books and sources as reference to my knowledge. These are: * Classwork Notes * Nelson Module Textbook * Revision Guide My Results Temperature Experiment one Experiment two AVERAGE 10�C 24 26 25 20�C 17 21 19 30�C 14 14 14 40�C 11 9 10 50�C 5 9 7 60�C 5 5 5 Analysis As you can see from the graph and table, my results to show a trend, that the higher the temperature the faster the reaction, this trend also supports my prediction. ...read more.


I believe that I did get a suitable range of results for this experiment. I recorded results from temperatures that ranged from 10�C to 60� C and I think that this is a very good range to see how temperature affects the rate of reaction. However, I feel that this also reduces the chance of knowing if anything changes if the temperature reaches a certain point. Perhaps doing the temperature even higher would enhance my results, and make a clearer and more scientific response and results. Some other areas in the experiment that I feel I could have improved on were factors like controlling the stopwatch and measuring the amount of sodium hydrochloric acid and length of ribbon. There is lots of room for human error here. However the inaccuracies due to them were negligible because I paid close attention to these during the experiment. Overall, this investigation has been a very successful one. I feel my results and analysis have been as accurate and reliable as they could have been under the time allocated. However I feel with extra time, I could have repeated the experiment and made it even more accurate and adapted it to try other variables i.e. concentration or adding a catalyst. These are the ways that I could expand on the original question. Lucy Gillett Science Coursework 1 Rate of Reaction ...read more.

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