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Evaporation Coursework.

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Introduction

Evaporation Coursework By Alex Powell Background and Prediction Evaporation is the process of a substance turning from its liquid form to its gaseous form. This occurs when a substance (in liquid form) is heated to a certain temperature - this temperature varies between substances and is called the boiling point. What happens is that as heat is applied to the liquid the particles inside it absorb the energy from the heat and become more and more excited (they vibrate more quickly) as more heat is applied. Eventually the particles become so excited that they break free from the surface of the liquid and become vapour. Evaporation has occurred at this point. The reason a liquid becomes a gas when the particles become excited is that a gas has much weaker inter-molecular bonds than a liquid. ...read more.

Middle

Equipment I will need: * Incubator; * Stopwatch; * Thermometer; * 3 measuring cylinders * 3 beakers; * Ethanol; * Paraffin; * Water. Prediction I predict that the water will evaporate the most because it has the lowest atomic mass (18) of the three substances. Paraffin will hardly evaporate, if at all, due to its huge atomic mass (632!). Results Water Ethanol Paraffin Before 20cm� 20cm� 20cm� After 18cm� 10cm� 20cm� The data that I have collected may be inaccurate because while the beakers were in the incubator somebody tampered with the temperature control. However, there was not enough time for me to repeat the experiment and recollect all of the data so I am continuing with the data I already have. ...read more.

Conclusion

Evaluation The only part of my results which I expected was that of paraffin not evaporating. The results for ethanol and water surprised me as the substance with the lower atomic mass (water) did not evaporate nearly as much as the substance with the higher atomic mass (ethanol). The experiment could be improved for greater accuracy by weighing the beakers of liquid before and after they are placed into the pre-heated incubator for a set amount of time. This would prevent loss of water when transferring substances between containers. To be entirely satisfied with my data I would need to do this experiment at least three times to ensure that I had collected accurate data. I would also ensure that the actual liquid was at 60�C for 30 minutes rather than the environment into which the liquid was placed being at 60�C for 30 minutes. Alex Powell - Evaporation Coursework - Page 1 of 3 ...read more.

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