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# The aim of this investigation is, to find out which molecules transfer the most energy - investigating fuels

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Introduction

INVESTIGATING FUELS DO LARGE MOLECULES TRANSFER MORE ENERGY WHEN THEY BURN? AIM: The aim of this investigation is, to find out which molecules transfer the most energy. PREDICTION: I predict that as the numbers of particles are increased, the energy transferred will also be increased. We will use methanol, ethanol, propanol, butonol and octanol. The word and symbol equations for these reactions are: Methanol: Methanol + oxygen carbon dioxide + water C2H5OH + 3O2 2CO2 +4H20 Ethanol: Ethanol + oxygen carbon dioxide + water C2H5OH + 3O2 2CO2 + 3H20 Propanol: Propanol + oxygen carbon dioxide + water 2C3H7OH + 9O2 6CO2 + 8H2O Butanol: Butanol + oxygen carbon dioxide + water C4H9OH + 6O2 4CO2 + 5H2O Octanol: Octanol + oxygen carbon dioxide + water C8H17OH + 12O2 8CO2 + 9H2O All of these reactions are exothermic reaction. ...read more.

Middle

7) Repeat this 3 time. 8) Repeat step 1-7 for each substance. Variables that stay the same: Amount of water (100g) Calculate energy per gram Same increase in temperature. APPARATUS: 1) Thermometer 2) Metal beaker 3) Copper tin 4) Substance 5) 100g water RESULTS: methonal repeats mass at start mass at end change in mass temp at start temp at end increase 1 134.4 136 1.6 21 41 20 2 129.8 128.3 -1.5 19 39 20 3 128.3 126.8 -1.5 19 39 20 average -1.5 20 butanol repeats mass at start mass at end change in mass temp at start temp at end increase 1 105.8 104.3 -1.5 22 44 22 2 104.4 102.6 -1.7 22 49 27 3 102.6 101.4 -1.2 19 39 20 average -1.5 23.5 octanol repeats mass at start mass at end change in mass temp at start temp at end increase 1 104 102.9 ...read more.

Conclusion

8400 1.2 =7000 CONCLUSION: My results show that as the number of particles are increased, the energy transferred was also be increased. EVALUATION: I think that the test was not a fair test. There are a number of reasons for this: 1) The copper can is metal. Metal is a good conductor of heat; therefore some of the heat released in this reaction would have been collected in the copper can. 2) There was window close by to where we did the experiment. A draft could have come through and made a few results inaccurate. 3) Not all-key variables were controlled i.e. "the same increase in temperature." To improve this experiment we could have closed the window so the draft could not interfere with our results. If this was controlled we would have got more accurate result. I think the apparatus we used was good enough for the experiment. ...read more.

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