30-thermodynamics - Energy, Enthalpy, & Thermochemistry...

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1 Week 12 CHEM 1310 - Sections L and M 1 9.1 The Nature of Energy 9.2 Enthalpy 9.3 Thermodynamics of Ideal Gases 9.4 Calorimetry 9.5 Hess’s Law 9.6 Standard Enthalpies of Formation 9.7 Present Sources of Energy 9.8 New Energy Sources Week 12 CHEM 1310 - Sections L and M 2 Review of Terms q = heat absorbed or emitted If heat is absorbed, then q is positive If heat is emitted, then q is negative w = work done by or on a system w = -P external V E = q + w H = enthalpy = q We’ll look at calculations involving these terms more closely later Week 12 CHEM 1310 - Sections L and M 3 Additional Review Enthalpy of a Reaction Discussed during last class… Enthalpy of a Phase Change H fusion H freezing H vaporization H condensation Δ H rxn = H products – H reactants
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2 Week 12 CHEM 1310 - Sections L and M 4 Phase changes are not chemical reactions but involve enthalpy change H 2 O (s) H 2 O (l) Δ H fusion = + 6 kJ at 0 °C Notice what the enthalpy change is called for this phase transition! Enthalpy of Phase Changes
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This note was uploaded on 08/23/2011 for the course CHEM 1310 taught by Professor Staff during the Spring '11 term at University of Florida.

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30-thermodynamics - Energy, Enthalpy, & Thermochemistry...

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