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Factors affecting the rate of Cooling

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Introduction

Adam Painter 11 set 1 Mr.Carter Factors affecting the rate of Cooling Purpose The purpose of the investigation is to find the factors affecting the rate cooling. Also to show that there is a relationship between two factors that affect the rate of cooling if there is two factors. Prediction In my experiments I am going to use 6 varied sized beakers, I will keep the volume inside the beakers at a constant 50ml. I would like to prove that when I change the size of the beaker, larger, then the cooling would take less time. This will be because more surface area will be exposed. 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. ? In the first experiment a lot of heat will be lost because the particles have a large amount of energy. ? ...read more.

Middle

I will keep the total volume of water at a constant 50cm3. The stopwatch will be started as soon as the liquid reaches 95oC and when the Bunsen burner has been removed. For this experiment I am going to change the surface area exposed to the surrounding air. I will use six different sized beakers each with a different radius in order to gather enough information to see a pattern if there is one. Results Experiment Number Area of Beaker Cm2 Capacity of Beaker Time (Minutes) Average Time (Minutes) ____10000____ Average Time (to 1 decimal place) 1 13 50 18:51 18:51 8.8 2 - 1 23 100 16:04 16:04 10.4 2 - 1 47 250 10:08 10:08 16.4 2 - 1 55 400 9:48 9:48 17.0 2 - 1 65 800 9.34 9.34 17.4 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) ...read more.

Conclusion

To help with this problem I could have heated more than enough water and the poured the correct amount into another beaker, however, a lot of heat my have been lost in this way. A waterproof container may have also been helpful as it was have meant that no water to could be lost through evaporation. Another factor affecting my results could have been the humidity within the room on different days. This would have effected the cooling slightly but enough to make a difference. The slight heat would have made the molecules slightly more energetic but not enough to disrupt the experiment I don't believe. An alternative may have been to use a sealed off laboratory or to do all the experiments within the same climate Overall I was delighted with how the experiments ran and how my results were gathered and turned out. To perform the experiment again I would need to use many mechanical aids as possible so that I could exclude human error wherever needed. Thus making more accurate and fairer results. ...read more.

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