Lecturez10SHWeb

Lecturez10SHWeb - Wed. Sept. 28, 2011 Todays Lecture...

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1 Wed. Sept. 28, 2011 Today’s Lecture Energy, Enthalpy, and Thermochemistry • 9.1 The Nature of Energy • 9.2 Enthalpy Lecture 10
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2 • 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 _______________________
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3 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 difference Work: force acting over a distance ____________: _____________
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4
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5 State function: a property of a system that depends only on its present state. i.e., it is path independent – Important points:
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Lecturez10SHWeb - Wed. Sept. 28, 2011 Todays Lecture...

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