dvb032708a4 - Thermodynamics vs Kinetics Today Kinetics How...

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Principles of Chemistry II © Vanden Bout Today Kinetics How fast are reactions? What are the rates? Principles of Chemistry II © Vanden Bout Thermodynamics vs. Kinetics Diamond Graphite ! R G° = -3 kJ mol -1 Graphite is lower in free energy than Diamond Reaction of Diamond to Graphite is spontaneous THE REACTION IS JUST VERY VERY SLOW Principles of Chemistry II © Vanden Bout Thermodynamics Compares Free energy of reactants and products This is the ideal case assuming everything can ±nd its lowest energy state (time is irrelevant) Kinetics What is actually happening How long does it take convert reactants to products Diamonds are unstable Diamonds are "kinetically trapped" in the unstable state Principles of Chemistry II © Vanden Bout What prevents reactions form going "downhill" in energy? 2H 2 (g) + O 2 (g) 2H 2 O(g) Energy Thermodynamics deals with the initial and ±nal states Kinetics deals with the path between them
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Principles of Chemistry II © Vanden Bout Why is there a "barrier"? You have to break the "old" bonds
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This note was uploaded on 05/01/2008 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas.

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dvb032708a4 - Thermodynamics vs Kinetics Today Kinetics How...

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