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To find the effects of change of the variable on a reaction between Magnesium and Hydrochloric acid

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Introduction

Aim: To find the effects of change of the variable on a reaction between Magnesium and Hydrochloric acid Reactions occur when Hydrochloric acid particles collide with the Magnesium. They all work by increasing the number of Magnesium collisions. There are a number of factors that change the speed of a reaction: * Temperature * Concentration of Hydrochloric acid * Surface area * Addition of a catalyst To make a choice for this experiment we have to choose which is the most feesable in the circumstances. Temperature: Temperature will affect the rate of reaction because an increase will speed up the movement of the Particles so that they collide more frequently. However, it is not a good option in the circumstances because the required amount of variations is 5, and using an icebox, room temperature and heating (we would not be able to keep different levels of heat constant) gives us only three variations. In addition, the reaction between a metal and an acid is exothermic, so the temperature of the experiment would not be the same half way through as at the beginning. ...read more.

Middle

Volume of Hydrogen produced (cm3) Average of 2 and 3 Experiment6.1 Experiment6.2 Experiment6.3 30 3 6 6 6 Experiment 2: 0.5 molars, 50ml Hydrochloric acid, 80mm Magnesium, Time (seconds) Volume of Hydrogen produced (cm3) Average of 1 and 2 Experiment 5.1 Experiment 5.2 0 0 0 0 30 11 12 12 60 22 20 21 90 30 29 30 120 37 35 36 150 44 44 44 180 50 50 50 210 57 57 57 240 62 63 63 270 67 67 67 300 72 72 72 330 76 75 76 360 80 77 79 390 83 81 82 Time (seconds) Volume of Hydrogen produced (cm3) Average of 1&4 Experiment4.1 Experiment4.2 Experiment4.3 Experiment4.4 0 0 0 0 0 0 3 3 4 3 3 3 6 5 5 6 6 6 9 6 7 8 8 7 12 8 9 11 9 9 15 11 11 14 11 11 18 12 13 17 13 13 21 15 17 21 15 15 24 17 20 24 16 17 27 19 22 27 20 20 30 21 24 30 22 22 33 23 25 33 25 24 36 25 27 36 27 26 39 27 30 40 29 28 42 29 32 44 32 31 ...read more.

Conclusion

Keeping things constant through the results and during the experiment Temperature: We recorded different results on different days, which means that the temperature is variable throughout the course of our experiments. The temperature effected each experiment, and as we did not record the temperature on each day, it is impossible to tell how much difference it made to the overall picture. Result reliability: Many anomoulous results were produced. The ones recorded here are significantly out of line with the others. Experiment 1: the first point was not anomolous, but the gradient of the line from 0-60 seconds is vastly different from 60 onwards, so it is not counted. Experiment 2: (390,82) Experiment 3: (86.5,65), (90,65) Experiment 4: (6,9), (9,12), (12,16), (15,19) Experiment 5: none Experiment 6: (12, 82.5) Conclusion: The final graph shows my prediction was correct in some aspects but not others. It is true (as shown in the graph) that as the concentration increases the rate of reaction increases. However the line is not y=x but a smooth curve with no anomoulous results, so it is not proportional. Conclusion verification To corroborate my conclusion I could experiment with different methods of recording the results and investigate the properties of the substances used to suggest why the rate of increase is not proportional. ...read more.

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