lecture11 - Fri. Sept. 26, 2003 Todays Lecture Energy,...

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Fri. Sept. 26, 2003 Today’s Lecture Energy, Enthalpy, and Thermochemistry • 9.1 The Nature of Energy • 9.2 Enthalpy
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• The nature of energy: – energy: capacity to do work or produce heat – law of conservation of energy: • energy can be converted from one form to another, but it can be neither created nor destroyed – i.e., energy of the universe is constant First law of thermodynamics
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– Thermochemistry: • the study and measurement of heat evolved or absorbed during chemical reactions – 2 types of energy: kinetic energy: energy due to the motion of an object KE = ½mv 2 potential energy: energy due to position or composition – Definitions: Temperature: reflects the random motion of particles Heat energy transferred due to a temperature
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State function: a property of a system that depends only on its present state. i.e., it is path independent – Important points: • energy can be transferred through work or heat state functions: internal energy (E)
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This note was uploaded on 01/16/2010 for the course CHEM CHEM 121 taught by Professor Peggy during the Spring '09 term at Simon Fraser.

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lecture11 - Fri. Sept. 26, 2003 Todays Lecture Energy,...

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