Science Chemistry Controlled Assessment Part 3 Analysis And Evaluation
Science Chemistry Controlled Assessment- Part 3 Analysis and Evaluation
1) Process the data you have collected and plot a graph(s) of the results of your expected results
Please refer to the graph attached to the document for the answer to this question.
2) Describe any patterns or trends in your results. Comment on any unexpected results.
Due to the positive correlation that my graph shows, I can infer that the more mass of CaCl2 added then the higher the energy release. Through further calculations I have found out that the average energy release per gram of CaCl2 is 224.96J. I also found out, thank to my gradient, that the average temperature rise per gram is 2.14 which is expected. If you check my research then you can see that these figures are slightly similar to them however are not exactly the same due to a reason which I will explain later on. Whilst going through my results I came across an anomaly which was not included when making the graph or taking an average. The anomaly can be located in the results table. The anomaly was in the third attempt for the final experiment which was when we added 5g of calcium chloride. This was an anomaly as it matched none of our previous result due to it being too high. We dealt with this by not including it in the averages or when finding out the energy transfers because it would then provide us with inaccurate results. I believe that we encountered an anomaly because of the fact that it was the last experiment so we were in a rush to get out of school and we may have rushed this final experiment thereby causing this anomaly. The line that was shown on the graph was proportionally steep as it was a perfect straight line showing that the mass of calcium chloride is directly proportional to the temperature rise. So from this we can also infer that the mass of calcium chloride is directly proportional to the energy released.
3) Compare results of your own investigation(Part 2) with the data from other groups and
1) Process the data you have collected and plot a graph(s) of the results of your expected results
Please refer to the graph attached to the document for the answer to this question.
2) Describe any patterns or trends in your results. Comment on any unexpected results.
Due to the positive correlation that my graph shows, I can infer that the more mass of CaCl2 added then the higher the energy release. Through further calculations I have found out that the average energy release per gram of CaCl2 is 224.96J. I also found out, thank to my gradient, that the average temperature rise per gram is 2.14 which is expected. If you check my research then you can see that these figures are slightly similar to them however are not exactly the same due to a reason which I will explain later on. Whilst going through my results I came across an anomaly which was not included when making the graph or taking an average. The anomaly can be located in the results table. The anomaly was in the third attempt for the final experiment which was when we added 5g of calcium chloride. This was an anomaly as it matched none of our previous result due to it being too high. We dealt with this by not including it in the averages or when finding out the energy transfers because it would then provide us with inaccurate results. I believe that we encountered an anomaly because of the fact that it was the last experiment so we were in a rush to get out of school and we may have rushed this final experiment thereby causing this anomaly. The line that was shown on the graph was proportionally steep as it was a perfect straight line showing that the mass of calcium chloride is directly proportional to the temperature rise. So from this we can also infer that the mass of calcium chloride is directly proportional to the energy released.
3) Compare results of your own investigation(Part 2) with the data from other groups and