Lecture-26 - Chem111 Fall, 2005 Lecture 26: Thermodynamics...

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Chem111 Fall, 2005 thermo-1 Kinetics = how fast do reactions go? Thermodynamics = which reactions go? macroscopic and experimental based on considerations of energy Definitions : Thermodynamics Thermochemistry Energy Æ Kinetic Energy + Potential Energy E = Internal Energy w = work & q = heat Joule = J = kg m 2 s -2 cal = 4.184 J (exactly) Lecture 26: Introduction Energy and Heat Conventions for q and w: q = + for heat added to the system - for heat removed from the system w = + for work done on the system by the surroundings - for work done by the system on the surroundings
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Chem111 Fall, 2005 thermo-2 Definitions (cont.) system surroundings open system closed system isolated system extensive property intensive property thermodynamic state thermodynamic process reversible irreversible State functions
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Chem111 Fall, 2005 thermo-3 First Law of Thermodynamics To change the energy of a system … 1. Add matter 2. Add heat (q) 3. Add work (w) heat (q) Æ
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Lecture-26 - Chem111 Fall, 2005 Lecture 26: Thermodynamics...

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