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Finding out the amount of energy given off by different types of alcohol when ignited.

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Introduction

For my investigation I will be finding out the amount of energy given off by different types of alcohol when ignited. To do this I will be burning the alcohol in a small glass burner, with the flame coming of the burner I will heat a set amount of water in a metal can for two minutes. After the two minutes is up I will extinguish the flame and record the rise in temperature of the water. I will also record the difference in mass of the alcohol after the two minutes. I will use five different alcohols in this investigation with a wide range of structures to hopefully produce five valid results. The Equipment: * Alcohol Burner * Metal Can * Retort Stand * Boss & Clamp * Thermometer * Wooden Splint These alcohols are hydrocarbons, this means they are made up of Hydrogen and Carbon. I'm predicting that the alcohol with the most amount of Hydrogen will give off the most energy. ...read more.

Middle

Start Temperature : 26? c, 28?c, 25?c Finish Temperature : 55?c, 46?c, 45?c Alcohol Start Mass: 10.7, 10.2, 9.9 Alcohol Finish Mass: 10.2, 9.9, 9.7 Pentanol - 55ml of H2O heated for 2 mins. Start Temperature: 26?c, 27?c, 25?c Finish Temperature: 60?c, 52?c, 53?c Alcohol Start Mass: 14.6, 14.0, 13.6 Alcohol Finish Mass: 14.0, 13.6, 13.2 Butanol - 55ml of H2O heated for 2 mins. Start Temperature: 26?c, 28?c, 25?c Finish Temperature: 49?c, 54?c, 45?c Alcohol Start Mass: 14.6, 14.3, 14.0 Alcohol Finish Mass: 14.3, 14.0, 13.6 Methanol - 55ml of H2O heated for 2 mins. Start Temperature : 25?c, 26?c, 27?c Finish Temperature: 43?c, 45?c, 44?c Alcohol Start Mass: 10.3, 9.9, 9.5 Alcohol Finish Mass: 9.9, 9.5, 9.2 Ethanol - 55ml of H2O heated for 2 mins. Start Temperature: 23?c, 23?c, 24?c Finish Temperature: 36?c, 35?c, 36?c Alcohol Start Mass: 12.3, 12.1, 11.7 Alcohol Finish Mass: 12.1, 11.7, 11.5 Working Out Energy Values: I will use the following formula to work out the energy of each alcohol: Energy (J) ...read more.

Conclusion

has 12 of these bonds the total energy given off should be 4944Kj compared with Methanol with four C-H bonds that should have a total of 1648Kj. The is a big difference explaining the difference in this investigation. The procedure is used was safe and successful and produced good results. The quality of the results was fine as there was one anomaly. There are many reasons why this could have happened, as the method was not very accurate some heat would have been lost t the air and the metal can. If I had positioned the can too far away from the flame the results would not be accurate, this could be a reason for the anomaly. The graph shows a strong positive correlation proving that my prediction was correct and the more carbons the more energy is released. For more accurate results the experiment could be held in room of constant temperature. Equipment could be used to reduce the amount of heat lost to the surrounding air. ?? ?? ?? ?? Investigation Into Burning Alcohols ...read more.

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