2009-11-17 - Thermodynamics, Second Law - Entropy

2009-11-17 - Thermodynamics, Second Law - Entropy - Chapter...

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Chapter 10: Thermodynamics, The Second Law References: - Chemical Principles, Steven S. Zumdahl, Fifth Edition, Houghton Mifflin Custom Publishing, Boston, MA - Professor Paul Mc Cord Notes, CH 301, University of Texas at Austin 1
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1 – ENTROPY What do we know: - Heat and Work are equivalents ways of changing the energy of a system. - The enthalpy change is equal to the heat released at constant pressure. - We can predict how much heat ( D H) is produced (or consumed) by a chemical reaction. What are we going to learn today: - Why one chemical reaction has a natural tendency to occur but another one does not (second law of thermodynamics) First Law: - If a reaction takes place D E = q + w Spontaneous change: -A process is spontaneous if it has a tendency to occur without being driven by an external influence; spontaneous need not be fast. - Energy and matter tend to become more disordered. - The entropy (S) is a measure of disorder. Low entropy means little disorder; high entropy means great disorder
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Second Law of Thermodynamics : The entropy (S) of an isolated system increases in the course of any spontaneous change
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2009-11-17 - Thermodynamics, Second Law - Entropy - Chapter...

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