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Once the experiment is underway I will time how long it takes for the magnesium to disappear, once it has I will stop the clock. I will use 25ml of hydrochloric acid and 10g of magnesium for each experiment and I will keep the equipment and the room temperature constant during the experiments. This will make a fair test. To keep the experiment safe I will take extra precaution when handling acid and always wear goggles.
Results Temperature (i?? C) 1st result (seconds) 2nd result (seconds) Average (seconds) The results show that my prediction was correct, as the temperature increases the speed of the reaction increases. I have found out that there is a positive correlation between the temperature increase and the speed of the reaction. Evaluation I could have improved the experiment by using more accurate equipment this would have made the experiments more accurate.
I could have also done the experiment under more precise and constant conditions (e. g.if the room temperature for all the experiments was exactly 20. 6i?? C). I could have also completed more repetitions of the experiments; this would have made the results more reliable. Also when heating the acid you are not heating the metal. So when the medal is added to the acid in the experiment set-up there could be a temperature change in the mixture causing inaccuracies. I believe that all the results taken were good, none were anomalous.
The only result that could be slightly anomalous is the 1st result taken at 10i??C, but this is only slightly different to the second result, and when the average is taken the chart and line of best fit evens out well. The evidence strongly confirms my prediction, it is clear that as the temperature increases the reaction time decreases. This proves my theory and I am happy with the way the experiment has been undertaken. Show preview only The above preview is unformatted text This student written piece of work is one of many that can be found in our GCSE Patterns of Behaviour section.