Comparing the enthalpy changes of combustion of different alcohol’s

liquid fuel. Put 100cm3 of cold water in a copper can and record its temperatureSupport the copper can approximately 2cm over a spirit burner containing the fuel you are going to test. Arrange a draught system to reduce energy loss.Weigh the spirit burner Replace the spirit burner under the copper can and light the wickUse the thermometer to stir the water al the time it is being heated. Continue heating until the temperature has risen by 15oC – 20oC. Do not let the thermometer touch the bottom of the copper can as this is the hottest part of the can and so the experiment would be unfair.Extinguish the burner and immediately weigh the fuel burner to note the mass of fuel burned Keep stirring the water and note the highest temperature reached.Subtract the starting spirit burner weight from the second to retrieve the amount of fuel burned within the experiment.Clean the copper can of any carbon on the outside with water and a cloth.Replace the copper can in its original place and put 50ml of water inside it.Replace the spirit burner under the copper can and redo the experiment as many times as required. Risk Assessment Ethanol and Methanol – -    Highly flammable and harmful -    May cause narcotic effect if inhaled Handle with care and use eye protectionIf alcohol catches fire then cover with a heat proof mat to starve of oxygen Propanol – Highly flammable and harmfulHave flash points below 21oC and may easily catch fireVapors may cause headaches and dizziness and can irritate the eyes and skinWear eye protection The room should be well ventilated The plan I have devised is likely to provide precise and reliable results as I have carried out the experiment myself and written down a step by step procedure of what I did when I carried out the experiment myself. The points are easy and clear to understand, so that any student would be able to follow them. The sources I have used to devise my plan are:   Hazard cardsChemical ideas – Salters advanced chemistryWorksheet DF1.2