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Factors affecting the rate of cooling

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Introduction

Science Coursework Factors affecting the rate of cooling Aim: To investigate and acknowledge factors of heat loss efficiency, radiation. Introduction: The experiment will take place with three conical flasks with the same amount of water in each flask. The three flasks will be different colours, which are black, silver and a clear glass. The experiment will be carried out twice, in one case the factors affecting the rate of cooling will be experimented in the lab and in the other case the factors affecting the rate of cooling will be experimented on the data logging, produced as a graph. Scientific Knowledge: Loss of heat travels in three different ways. These are conduction, convection and radiation. Conduction is when something is heated and the heat energy causes molecules at the heated end to vibrate violently and the vibrating molecules cause nearby molecules to vibrate as well. In this way heat travels slowly through solids. ...read more.

Middle

In this piece of coursework we are studying radiation, the loss of heat and transfer from one place to another by electromagnetic waves, and how quickly it cools down. Method (1) and Diagram: Thermometer Black Silver Clear glass I will set up my apparatus as the diagram shown above. Each flask will contain a maximum of 250cm3 of water. There will also be a polystyrene top on, with a hole on the top to allow the thermometer through. The top will help prevent convection, which is the transfer of heat by movement of a liquid or a gas dependent on its density. Where as in this case we are studying radiation, which is the energy transfer from one place to another by electromagnetic waves. I will pour some boiled water in to each of the three conical flasks and then quickly put the thermometer in. I will then record the temperature of the water every minute for twenty-five minutes, using the facility of a stopwatch. Method (2): Apparatus: Conical flask (black, silver and glass) ...read more.

Conclusion

Results table: Temperature of how fast each flask cooled down (degrees Celsius). Time (min) Black Silver Clear glass 1 79 82 84 2 77 81 83 3 76 81 81 4 75 78 80 5 73 76 79 6 72 76 77 7 70 75 76 8 69 72 75 9 68 70 74 10 67 69 73 11 66 68 73 12 65 68 72 13 64 67 71 14 63 66 70 15 61 65 69 16 61 64 68 17 60 64 66 18 58 64 64 19 56 63 63 20 55 63 62 21 55 62 60 22 54 60 58 23 54 59 57 24 53 59 56 25 51 58 55 Results (2): Data logging Results: Red: Black flask Blue: Clear, glass flask Green: Silver flask Conclusion: In this experiment I can conclude to say that the higher the rate of concentration the more the rate of reaction. This proves my theory of the collision theory. In order to complete this experiment more efficiently and effectively I could have had used better ffff ...read more.

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