... may damage to our body. When I heating the measuring cylinder, I have to make sure the retort stand hold the measuring cylinder exactitude. Spirit burners are the safest way of burning the alcohol but we should not be to fill them. Scientific knowledge Stress the important of fair testing, for example the height of the flask above the wick. We can work out the number of moles used and find the energy produced per mole. A temperature sensor attached to a computer can be used in place of a thermometer. It can plot temperature change on a graph and allow better quantification of the heat produced. A fair test To make a fair investigation, I have to keep the water at the same volume at each time when I start doing my experiment, and try to keep checking the temperature nearly. Also repeat the experiment at least two times to get the average; ...

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