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Factors affecting the rate of Cooling

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Introduction

Factors affecting the rate of Cooling Purpose The purpose of this investigation is to find the factors affecting the rate cooling. If there are more than two factors that do affect the rate of cooling then are there relationships between them. Prediction In my experiments I am going to use 6 different sized beakers, however I will keep the volume inside the beakers at a constant 50ml. It is likely that when I change the size of the beaker to a larger one then the cooling will take less time. This is because there is more surface area exposed to the surrounding air. It is also likely that if I increase the volume but keep the same size beaker the cooling will take longer. This is because the liquid not exposed to the air will retain its heat for a longer period of time. It is also likely that when the temperature of the solution is increase the speed of the cooling will increase. This is because the molecules will have more energy; this will make them move faster. This will mean that the molecules will disperse heat evenly. ...read more.

Middle

2 1 102 800 5.32 6.40 25 2 7.47 Experiment Number Volume Cm3 Temperature oC Average Temperature oC ____1000____ Average Temperature oC (1 decimal place) 1 50 57 57 17.5 2 - 1 100 64.5 64.5 15.5 2 - 1 150 65.5 65.5 15.3 2 - 1 200 71 71 14.1 2 - 1 250 72 72 13.9 2 - 1 300 73 73 13.7 2 - 1 350 75 75 13.3 2 - 1 400 76 76 13.2 2 - Conclusion When looking at the graph above it is quite obvious to see that the speed of the cooling decreases as the volumes is increases. It is therefore safe to make the assumption that the speed of the cooling is directly proportional to volume. When looking at the graph above it is quite obvious to see that the speed of the cooling decreases as the surface area is decreases. It is therefore safe to say that the speed of the reaction is directly proportional to the surface area. This graph shows the cooling curve to a greater effect. This graph shows clearly that the capacity of the beaker and the time it takes for the liquid to cool are directly proportional. ...read more.

Conclusion

A possible solution to this problem would be to have completed all experiments on the same day. This way it would be less likely for humidity levels to fluctuate too much. Another alternative may have been to use a sealed off laboratory Finally, visibility was a problem. Light in the room and eyesight quality could have made a difference. Light in the room changed several times as the experiments were carried out on different days and therefore light would have been different. This could have been overcome lighting the lab with a certain light in order to keep the light a constant; also the same person could have been used to measure the thermometer. When considering eyesight, it is easy for mistake to be made as different people have different eye quality and perceptions of when visibility is none existent. Therefore the only way to overcome different perceptions is to use an electrical thermometer. This would overcome human error. Overall I was pleased with how the experiments ran and how the results turned out. If I were to perform this experiment again I would attempt to use as many mechanical aids as possible so that I could exclude human error wherever possible. Glen Baker April 07 C:\Documents and Settings\ckd\My Documents\essays\doc\after\7886.doc Page 2 of 5 ...read more.

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