Chapter 4 CHM 341 Fall 2016.

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Presentation transcript:

Chapter 4 CHM 341 Fall 2016

II. Energy & Metabolism Activities of organisms constantly demand energy Study of energy = thermodynamics

A. 1st Law Energy is conserved and cannot be created or destroyed Universe is made of 2 parts

B. 2nd Law Entropy tends to increase Spontaneous processes are characterized by conversion of order to disorder

C. 3rd Law and Gibbs Free Energy Entropy of perfect crystal is zero at 0K For spontaneous process DH <0 DS >0 DG < 0 (free energy must be negative)

2. Why is life thermodynamically possible? Must be thermodynamically spontaneous Many cells have DG > 0 when tested alone, but are spontaneous in the body – how is that possible?

D. Equilibrium equation Relating Gibb’s Free energy to equilibrium