Chapter 17 Lecture 2 written

Chapter 17 Lecture 2 written - Chapter 17 Lecture 2...

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Chapter 17 Lecture 2 Thermodynamics (completed) Third Law: The entropy of a perfect crystal at 0 K is zero Second Law: Entropy for the universe is always increasing. Suniverse = Ssystem + Ssurro~ndin~s > 0 Means: In the process of injecting order into a system, there is a bigger mess somewhere else i ytkb;b A +@- ,4S c0 hTkarT prgddh -nb hhhise , '&"+ 771ere ;1 "4 h" AS''(-) WT M -* Gibbs Free Energy: Enthalpy + Entropy - '/s 'fr -t'ts dkCk ~WM, AG = AH - TAS This is the complete thermodynamic picture, but does not tell you how fast the reaction will occur. AG is about the propensity for a reaction to occur: /G.~Ltics ;'s 7%- resr',, im+,L 0d-t 7-14 rN< k When chemicals mix . . . . . . < 0 reaction will be spontaneous AG>O reaction will be non-spontaneous
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AG = AH - TAS Case AS Result 1 - + - Spon. (all T) Spontaneous reactions occur when: heat is released and a mess results 203 + 302 Result 2 L - - - Spon. (Low T) The heat released compensates for the Increase in order, but only at low T N2 + 3H2 + 2NH3 Result 2H - - + Nonspon. (High T) Rather rare: The reaction stops when the Temperature is raised.
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This note was uploaded on 04/16/2008 for the course CHEM 1123 taught by Professor Paul during the Fall '06 term at Arkansas.

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Chapter 17 Lecture 2 written - Chapter 17 Lecture 2...

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