Lecture 24 - 3/13/10 UNIT 4: Thermochemistry/Thermodynamics...

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3/13/10 1 UNIT 4: Thermochemistry/Thermodynamics - concerned with heat affects accompanying chemical reactions, energy, and spontaneity 1 We will answer questions such as: If so, how far will it proceed? Does a given chemical reaction proceed in the forward direction? Or, in the reverse direction? How the conditions be modified to obtain a better yield? Does the reaction release energy? Or absorb energy? (Connection to equilibrium: large K, small K, intermediate K?) (exothermic) (endothermic) 2 System : Surroundings : Heat Work Heat Work Matter exchange of heat/ work & matter between system & surroundings exchange of heat/work between system & surroundings no exchange of heat/work or matter between system & surroundings Heat Work Heat Work Open system Closed system Isolated system 4.1. Energy, work and heat: The first Law (Sections 6.1) everything else part of universe we are studying (often: reactants + products) 3 Energy : the capacity to do work (w) or to produce heat (q) Can’t measure absolute energies Measure energy transferred: Change in energy (
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Lecture 24 - 3/13/10 UNIT 4: Thermochemistry/Thermodynamics...

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