18-19 SpontEntLandscape - 1 CHEM112 LRSVDS Thermodynamics...

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CHEM112 LRSVDS Thermodynamics part 1 1 CHEM112 LRSVDS Thermodynamics part 1 2 reactants products ! E 1 2
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CHEM112 LRSVDS Thermodynamics part 1 3 THERMOCHEMISTRY LAWS OF THERMODYNAMICS 1 st Law: The total energy in the universe is constant. ! E universe = 0 ! E universe = ! E system + ! E surroundings ! E system = - ! E surroundings Heat and work: ! E system = q + w and for PV work at const. pressure, ! E system = q – P ! V CHEM112 LRSVDS Thermodynamics part 1 4
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CHEM112 LRSVDS Thermodynamics part 1 5 Example Problem: What is the Heat of Formation of gaseous mercury? CHEM112 LRSVDS Thermodynamics part 1 6 1. Metals: all are ___________ ( except ____ ) 2. Metalloids: all are _________ 3. Nonmetals A: Noble gases (Group 8): _________! B: Diatomics : (there are 7)_____________ which are gases? _____________ which is a liquid ? ____ which is a solid? ____ C: Other non-metals are __________ C (graphite), S, P, Se What are the Standard States of the Elements? (at 298K and 1 atm)
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CHEM112 LRSVDS Thermodynamics part 1 7 SPONTANEOUS REACTIONS Define spontaneous reaction: Note: spontaneity has nothing to do with the rate at which a reaction will occur. ( A spontaneous reaction may be fast or slow.) Bunsen Burner: Do I have to keep lighting it? CH 4 (g) + 2 O 2 (g) " CO 2 (g) + 2 H 2 O(g) Spontaneous or Non-Spontaneous? Reverse of Rusting? 2 Fe 2 O 3 (s) " 4 Fe(s) + 3 O 2 (g) Spontaneous or Non-Spontaneous? NaCl(s) " Na(s) + " Cl 2 (g) Spontaneous or Non-Spontaneous? CHEM112 LRSVDS Thermodynamics part 1 8 Is this process spontaneous? Can this process do work?
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This note was uploaded on 12/20/2011 for the course CHEM 112 taught by Professor Vandersluys,lorschmid,kylem during the Fall '07 term at Pennsylvania State University, University Park.

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18-19 SpontEntLandscape - 1 CHEM112 LRSVDS Thermodynamics...

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