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Testing Alcohol

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Introduction

Testing Alcohol Aim To find out if the number of carbon and hydrogen atoms in alcohol affect how well they burn. Apparatus Clamp stand, alcohol burners containing: methanol, ethanol and propanol, splints, goggles, heat mat, copper beaker, water, thermometer, scales, water. Method Put 100g of water in a copper beaker and put in a thermometer, record the temperature and attach to clamp stand. Weigh the alcohol burner containing methanol and record the result, place under the beaker. Light the alcohol burner and wait till the water has reached 10 c more than the starting temperature. Put out the alcohol burner and weigh again. ...read more.

Middle

24 24 24 24 End Temp ( c) 36 50 54 64 Change in temp ( c) 12 26 30 40 Start Weight (g) 217.8 164.1 175.34 216.53 End Weight (g) 216.53 159.82 172.46 213.51 Change in weight (g) 1.27 4.28 2.88 3.02 Ethanol 10 c 20 c 30 c 40 c Start temp ( c) 24 25 26 22 End temp ( c) 34 45 56 63 Change in temp ( c) 10 20 30 41 Start Weight (g) 119.96 255.60 135.06 119.09 End Weight (g) 119.09 254.18 132.92 117.03 Change in weight (g) 0.9 1.42 2.14 2.06 Propanol 10 c 20 c 30 c 40 c Start Temp ( c) ...read more.

Conclusion

I think the errors may have occurred because each group in our class was doing a separate part of the experiment, then we combined our results. This could mean that one group did the test slightly differently to the other. One group may have had the beaker further away from the flame than the other. Also the flame may have been longer for some groups than others, and this would cause a fluctuation in results. Some groups had different size beakers to other groups, meaning it would take more alcohol to heat up a smaller volume of water. If I were to repeat this experiment I would do the entire test by myself so I could ensure that all the tests were carried out in the same way. ...read more.

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Response to the question

A basic experiment. The candidate does not draw very valid conclusions as discussed below from their data and does not show scientific reasoning behind their statements. However, the candidate does show good consideration of possible errors in the experiment ...

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Response to the question

A basic experiment. The candidate does not draw very valid conclusions as discussed below from their data and does not show scientific reasoning behind their statements. However, the candidate does show good consideration of possible errors in the experiment by pointing out things that may have confounded the experiment which is good. Overall an okay baseline essay.

Level of analysis

The method should be set out in bullet points rather than continuous prose because this makes the different steps easier to follow and the text easier to read. The candidate does not make a prediction about the number of carbon and hydrogen atoms and the candidate should do this to show greater width of scientific research and a better understanding of the topic and experiment. The candidate states in their conclusion that they expected Propanolol to be the best alcohol and they should have stated why with a prediction earlier in the text rather than make sweeping statements in the conclusion without science to back their claims up. The candidate should also have stated what they kept the same e.g. mass of fuel to avoid bias in the experiment. By having different masses the candidate biased the experiment which makes their conclusion not very well thought out or valid. The conclusion points out some errors and do not point out any possible valid improvements which would indicate their understanding.

Quality of writing

The essay is set out into clear sub-sections which helps the reader to clearly identify each section. Spelling, grammar and punctuation are to a good standard and the candidate communicates concisely and clearly.


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Reviewed by skatealexia 10/07/2012

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