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Heat combustion of Alcohol

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Introduction

High Level Chemistry Heat of combustion of alcohol Design Prac Student: Kathy Nguyen Teacher: Mr Underwood Due Date: 23rd May 2009 To investigate the effect of one factor on the heat of combustion of the alcohol Background Information Alcohols are used as a source of fuel in many countries. For it to turn into fuel, alcohol must be burnt. Alcohol is also a good clean source of energy and heat. In this experiment I will be trying to find out the amount of energy produced when different alcohols are burned. In this experiment, the type of alcohol will be tested is Ethanol. Ethanol is a colourless liquid and is sometimes referred simply as alcohol or spirits. Carbon chains with a hydroxide molecule at the end of the chain make up an alcohol. Ethanol is a straight-chain alcohol and its molecular formula is C2H5OH. Its empirical formula however is C2H6O The heat of combustion of any substance is the amount of heat energy given out when 1 mole of that substance burns completely in air. ...read more.

Middle

Avoid contamination and residue to the next experiment when using the thermometer Distilled water will be used to thoroughly clean out the equipments before experiment. Equipments will not be reused for the next experiments. Materials * 3 L of water * 200 mL of 0.5 Molar ethanol in beaker * 200 mL of 1.0 Molar ethanol in beaker * 200 mL of 1.5 Molar ethanol in beaker * 200 mL of 2.0 Molar ethanol in beaker * 200 mL of 2.5 Molar ethanol in beaker * Bottle containing 800 mL of Distilled water * 15 � 150 mL Conical flask * 1 � Metal clamp * 1 � Wooden tongs * 1 � Retort stand * 15 � Spirit burner * 1 � Thermometer (� 0.01 �C) * 1 � Match box * 1 � Electronic scale (� 0.02 g) * 1 � Permanent pen * 5 � Label stickers Method Drawing up data tables Molar of Ethanol Trials Initial temp (�C) Final temp (�C) Temp change (�C) Initial mass (g) ...read more.

Conclusion

Weigh the spirit burner attached with the lid containing the alcohol and record the initial mass 8. Place the spirit burner under the conical flask and use the matched to light the wick 9. When the water temperature reaches approximately 40�C, blow out and extinguish the flame 10. Record the exact temperature reached when flames were extinguished 11. Using the tongs, move the spirit burner and lid to the electronic scale and weigh the final mass 12. Dispose the water and alcohol inside the spirit burner 13. Repeat steps 1 - 11, but change the type of ethanol in respect to independent variables 1.0 Molar, 1.5 Molar, 2.0 Molar and 2.5 Molar of ethanol 14. When repeating steps 1 - 11, make sure a new conical flask and water is used and also a new spirit burner is used 15. When all five experiments of the different molar concentration of ethanol is completed, repeat the experiment another two times for each molar concentration of ethanol in reference to the data table Calculations 1. Final temp - Initial temp = Temp change (�C) 2. Final mass - Initial mass = Mass used (g) ?? ?? ?? ?? Mr Underwood HL Chemistry Design Prac Kathy Nguyen Page 2 of 6 ...read more.

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