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Investigating Energy from Alcohols Coursework

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Introduction

Investigating Energy from Alcohols Coursework Aim: The aim of this investigation is to discover the energy given from alcohols when they are heated. Plan: In this experiment we are going to be investigating the energy given from alcohols. We are going to be using very precise equipment in this experiment so that our results are very accurate, for example the thermometer we are using can take a reading to the closest 0.1 decimal place. We are also going to make this a fair test by heating the alcohol for 3 minutes each time. I will be using fresh water each time. I will need to calculate the difference in mass before and after the experiment and calculate the difference in temperature before and after. ...read more.

Middle

You can use these bond energies to predict whether any given reaction will be endothermic or exothermic. Melting and boiling are both endothermic processes, as energy must be put in to break the interparticle forces. The relatively high figures for water reflects the high energy needed to overcome the unusually strong forces between the water molecules. When a fuel burns, it reacts with the oxygen in the air to give waste gases in a combustion reaction. During this reaction the fuel is oxidised. More importantly, the reaction gives out heat energy. Which means that combustion reactions are strongly exothermic. If there is not enough oxygen to go around, the carbon is not fully oxidised to give carbon dioxide. ...read more.

Conclusion

= (2 X 743) + (6 X 463) 4636 - 5750 = -1114 Propanol:- 2C3H8O + 9O2 = 6CO2 + 8H2O 2 X C - C = 696 7 X C - H = 2884 1 X C - O = 358 1 X O - H = 463 4401 + (9 X 496) 4401 + 4464 = 8916 + 3704 8865 - 12620 = -3755 Butanol:- C4H10O + 6O2 = 4CO2 + 5H2O 3 X C - C = 696 9 X C - H = 3708 1 X C - O = 358 1 X O - H = 463 5225 + 2976 8201 - 10574 = -2373 As the length of the carbon chain increases the energy produced also increases. ...read more.

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