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# How does the length of Magnesium affect the rate of reaction?

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Introduction

How does the length of Magnesium affect the rate of reaction? Input Variables - Magnesium strip Hydrochloric acid Outcome Variable - Release of hydrogen I have chosen to investigate whether the difference in length of a Magnesium ribbon, would change the speed in which the reaction between Hydrochloric acid and Magnesium takes. We will measure this by timing how long until the magnesium strip vanishes and there is no release of Hydrogen. Aim: I am trying to find out whether the length of Magnesium causes any alterations in the rate of reaction between Hydrochloric acid and Magnesium. I will be measuring this by timing how long it takes for the magnesium to be no longer visible and there is no hydrogen released. Prediction: I think that when Hydrochloric acid of the same volume come in to contact with Magnesium of different lengths of ribbon,, the rate if reaction for the longer strip would be far slower than the shorter one. I believe that this as the collision theory tells us that molecules collide which cause to react and merge to create a compound. ...read more.

Middle

I'll perform the investigation twice, and include the preliminary results with the main investigation to get a more accurate comparison. The test will take no longer than an hour. Equipment: � Hydrochloric acid � Test tube rack � Goggles � Measuring cylinder � Test tubes � Stopwatches � Magnesium strip Safety Procedure: Place test tubes in rack properly, secure goggles on and tie long hair back. . Keep Hydrochloric acid at a safe distance away and on a safety mat. Method: 1 - Place 4 test tubes in rack 2- Measure length of magnesium ribbon and cut into four pieces of 2cm, 3cm, 4cm and 5cm 3 - Place one into each test tube 4 - Measure 10ml of Hydrochloric acid in a measuring cylinder 5- Pour the acid into one test tube and start one stopwatch in synchronisation 6 - Repeat this action with other 3 test tubes 7- Stop the stopwatch and record down the timing when it stops fizzing Results Chart: Length of Magnesium 1^st attempt 2^nd attempt 3^rd attempt Averages 2cm 8.00 8.15 9.05 8.40 3cm 19.29 19.29 19.32 19.30 4cm 50.03 51.00 50.88 50.63 5cm 50.38 ...read more.

Conclusion

However, the tests that were performed were a fair test as the method used was very simple, so error wasn't a large factor. This meant that the solution could react without being tampered with. Although, on performing the second attempt for the 5cm strip, the tube was accidentally split by passers - by, so we had to stop the time and record the time thus far. This could be the cause for the anomalies within the results and if I were to do it again, I would expect the results to be greatly different. Due to the amount of stopwatches used in the experiment, we were able to get the exact time for each test tube, which was easier for recording than just using one, which I did during the preliminary experiment. Conclusion: In conclusion, I found out that my prediction was right and that the longer strip took a comparatively longer reaction time than the short two centimetre strip. This can be seen from the evidence gathered, which I believed to be accurate and would appear again if this experiment were to be performed once more. ...read more.

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