Physical Chemistry for the Chemical and Biological Sciences

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Outline of the Course 1) Review and Definitions 2) Molecules and their Energies 3) 1 st Law of Thermodynamics 4) 2 nd Law of Thermodynamics 5) Gibbs Free Energy 6) Phase Diagrams and REAL Phenomena 8) Chemical Equilibrium 9) Kinetics
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Section 5.0. Gibbs Energy (G) Goals 1) Define Gibbs Energy 2) Review conditions for equilibrium and spontaneous processes with respect to G 3) Calculate the standard molar Gibbs Energy of Formation 4) Understand Dependence of G on T 5) Understand Dependence of G on P *** read most of Chapter 6 in Chang Text
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Gibbs Energy (G) 1 st Law of Thermo. dealt with energy balance (“Conservation of Energy”) 2 nd Law of Thermo. tells us which processes are Spontaneous ……. .However, the equations we have derived/used to this point are not very convenient because they require consideration of the Surroundings and Universe…………. ……………(re: S universe = S system + S surr ) ……. .much more simple to just consider the system……………. Gibbs Energy is a thermodynamic function that only requires consideration of system.
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Consider a system in thermal equilibrium with surroundings………. if a process occurring in the system results in transfer of an infinitesimal amount of heat, dq, from system to the surroundings (-dq sys = dq surr ). dS univ = dS sys +dS surr 0 = dS sys + (dq surr /T) 0 = dS sys -(dq sys /T) 0 If the process takes place at constant pressure then dq sys = dH sys dS sys -(dH sys /T) 0 x (-T) dH sys -T dS sys 0 G = H - TS
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At constant temperature the change in the Gibbs energy of The system in an infinitessimal process is given by…………. . dG
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5a - Outline of the Course 1) Review and Definitions 2)...

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