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# To find out how much energy different alcohols contain when burnt.

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Introduction

Aim: To find out how much energy different alcohols contain when burnt. Prediction: I predict that the more carbon atoms in the formula for alcohol, the more energy the alcohol will release when burnt. Reason: As some alcohols contain more carbon and hydrogen atoms burnt, they will form more Carbon dioxide. The more CO formed, the more energy is given off as energy is given off when bonds are formed. The more CO and more water is being formed each time, therefore more bonds are being created and therefore more energy is released each time. Key Factors: > Amount of water used > Width of wick (More heat could be produced as more alcohol would burn with a thicker wick) > Diameter of beaker containing water > Amount of time water is heated for (Allowing one alcohol to heat for longer would give it more time to reach a higher temperature than the alcohol heated before it therefore making the results gathered from the experiment unreliable) ...read more.

Middle

To find out how much energy is in each alcohol using the results just gathered we first use the following equation: MC? M = Mass C = Specific heat capacity of water which is a constant 4.2 ? = Temperature difference of water (the temperature you are allowing the water to be heated by) E.G. 100g x 4.2 x 30?C = 12600j We then use the following formula to work out the energy produced: Grams of burnt alcohol=6g (To work out how much alcohol has be burnt you subtract the weight before the wick was lit and then after the temperature of the water had been heated by 30?C.) Mr of Methanol=32 6 divided by 32 = 0.1875 12600j divided by 0.1875 = 67200j 67200j divided by 1000 (to convert the number into Kj)=672Kj Analysis: From out experiment we found out that the more carbon and hydrogen atoms each alcohol has in its formula, the more energy is produced when the alcohol is burnt. This can be shown from the data we collected: Mathanol (Kj) ...read more.

Conclusion

Therefore is a 100ml measuring cylinder is used, you only need to measure 100ml out once, therefore only inducing a small error. I believe that some of the evidence we gathered is not accurate, I believe that the evidence gathered for butanol is inaccurate, this is because when the average of the set of data is calculated and then plotted on a graph with the rest of the alcohols, it does not fit on the line that is produced when the first 3 alcohols have a line drawn through them. Discounting the anamolie of the results gathered for butanol, we could continue the line of the graph and use it to find out the energy contained in other alcohols such as hexanol. This can be done by knowing hexanol's Mr and then tracing a line from the Mr of hexanol to the line that is produced when we link the first three results of the alcohols on the graph. When the Mr meets the line then follow a line downwards and the line will point to an energy value for that Mr, that energy value will be close to hexanols energy value. ...read more.

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