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prove Boyles Law

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GCSE Chemistry - Boyle's Law In the experiment to prove Boyle��s Law we set-up the following apparatus: {DIAGRAM} METHOD We pumped air into the tube until the pressure was as high as possible, which was 3.4x105 Pa. We recorded the volume of gas; it was 16.0cm3. We then let the pressure down slightly and recorded the pressure and volume again. We repeated this about 15 more times, which was when the pressure reached 1.03x105 Pa. Here are the results: Gas Pressure (x105 Pa) Gas Volume (cm3) 3.4 16 3.23 16.9 3.09 17.8 2.91 18.8 2.78 19.7 2.62 21 2.48 22.1 2.31 23.7 2.15 25.7 1.97 28.1 1.73 31.9 1.6 34.9 1.41 39.1 1.28 43.3 1.12 50 1.03 56 EXPLANATION Boyle��s law states that the volume of a fixed mass of ideal gas at constant temperature is inversely proportional to the gas pressure: P "f 1/v OR pv = constant This means that if p is doubled then v is halved, or, if p is halved then v is doubled. MOLECULAR EXPLANATION At room temperature and pressure, there are a certain number of gas molecules in 10cm3 of air. ...read more.


Therefore, if I plot a graph of p against 1/v and get a straight line then that means that Boyle��s Law is correct, this does roughly happen. EVALUATION For my evaluation I will know see what can be improved in the experiment. Firstly, the scales for both the volume and pressure were not sensitive enough. This leads to results being in accurate due to the results being hard to get right. However, this inaccuracy is a systematic error because it would affect all the results. Secondly, when we decreased the pressure the oil did not go down immediately. Instead, it clung to the sides of the tube. This would therefore make the volume lower than it should be and can cause the graphs to be inaccurate. Thirdly, the temperature of the apparatus could have changes towards the end of the experiment. This could explain why the last two results of pv are higher than the rest. Although our experiment did contain inaccuracies, it is accurate enough for a school experiment. ANOMALOUS RESULTS The main reason for an anomalous result in this experiment could be a human error. ...read more.


This would give me a more accurate result. I would also increase the pressure instead of decreasing it. This would stop the oil clinging to the sides so the volume reading would be correct. The next thing I would change would be the tube. I would make the tube longer and thinner. This would make the scale more accurate because the smallest of changes in volume would be seen easier. Although we did enough results, I would probably like to do the experiment one or two times extra to make sure I did not get it wrong. Looking at my graph, the last couple of results of pv are the highest, which could be due to the temperature changing. To stop this I would like to keep the temperature of the oil to be monitored to see if it goes up or down. If it did change then we would have to wait until it went back to normal to keep the experiment accurate. My final improvement I would like to make would be to use different gases so we can really say that Boyle��s Law is true for all gases and not just air. There are no comments on ""Boyles Law Investigation" - Why not be ...read more.

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