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Explain what is meant by thermal pollution and discuss the implications for life if a body of water is affected by thermal pollution

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Introduction

CHEMISTRY Explain what is meant by thermal pollution and discuss the implications for life if a body of water is affected by thermal pollution Thermal pollution is the degradation of water quality by any process that alters the temperature of a natural water body. This state predominantly arises from the waste heat generated by industrial processes, such as the generation of electricity. Water when used as a coolant for electrical power systems is simply returned back to the water source, affecting the dissolved oxygen (D.O) levels as well as water temperature, as shown in the diagram, posing significant implications for aquatic life. ...read more.

Middle

This is fatal for stenothermic organisms, like the Rainbow Trout, that rely on enzyme systems that operate in only narrow temperature ranges. Process and present information from secondary sources to assess the limitations of calorimetry experiments and design modifications to equipment used A Calorimeter is an instrument that measures the amount of heat released or absorbed by the contents during a reaction. Laboratory Calorimeter Bomb calorimeter - The predominant limit of the laboratory calorimeter is keeping the system enclosed, as the heat that the experiment aims to capture is susceptible to loss to the external environment, making it immeasurable - Even with the design modification of a tightly sealed lid, heat still escapes - ...read more.

Conclusion

A Bomb calorimeter. - Bomb calorimeters are usually used to attempt to ensure complete combustion of the sample, as they use a large volume of water as a heat sink for insulation, with a stirring rod to keep the water temperature homogeneous. Heat loss however cannot be fully eradicated - Bomb calorimeters cannot withstand reactions which liberate more than a set amount of energy, thus limiting the amount of sample that can be used - Accurate experimentation must also calculate the heat capacity of the reaction vessel, and their thermal conductivity, as heat liberated by the reaction is also absorbed by the calorimeter Reference list http://www.eoearth.org/article/Thermal_pollution?topic=49471 http://www.pollutionissues.com/Te-Un/Thermal-Pollution.html http://www.join2green.com/ThermalPollution.aspx http://www.chem.duke.edu/~bonk/EnvSupp/Chp10/Chp10.html http://www.ehow.com/info_8290898_calorimeter-its-limitations.html http://www.scribd.com/doc/27259289/Introduction-to-Bomb-Calorimetry http://abundantbrain.com/2010/05/is-a-calorie-a-calorie/ Jacaranda HSC science : preliminary course by Geoffrey Thickett ...read more.

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