Presentation on theme: "Thermodynamics Chapter 19. First Law of Thermodynamics You will recall from Chapter 5 that energy cannot be created or destroyed. Therefore, the total."— Presentation transcript:
Spontaneous Processes and Entropy Thermodynamics lets us predict whether a process will occur but gives no information about the amount of time required for the process. A spontaneous process is one that occurs without outside intervention.
Reversible v. Irreversible Processes Reversible: The universe is exactly the same as it was before the cyclic process. Irreversible: The universe is different after the cyclic process. All real processes are irreversible -- (some work is changed to heat).
The Second Law of Thermodynamics...in any spontaneous process there is always an increase in the entropy of the universe. S univ > 0 for a spontaneous process.
Free Energy Change and Chemical Reactions G = standard free energy change that occurs if reactants in their standard state are converted to products in their standard state. G = n p G f (products) n r G f (reactants)