Lecture2-ThermoReview

Lecture2-ThermoReview - Lecutre 2: Brief Review of...

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Lecture 2: Thermodynamic Review 1 Lecutre 2: Brief Review of Thermodynamics Review of Equilibrium Thermodynamics: Equilibrium Entropy Solution Thermodynamics Equilibrium Phase Diagrams Activity and Activity Coefficients
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Lecture 2: Thermodynamic Review 2 Entropy Entropy is a state function because the level of disorder of a system only depends on the current condition of the system. Consequently, the entropy change for any process joining the same two states is the same, whether the process is reversible or not. To calculate the entropy change for any process we just find a reversible path connecting the two states and calculate its change in entropy using the above formula.
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Lecture 2: Thermodynamic Review 3 The Second Law The Second Law : The entropy of the universe increases for all processes except reversible ones, for which there is no change in S univ . Once disorder is created, it cannot be destroyed. The changes in entropy of the system and surroundings are balanced for a reversible process. That is entropy is only transferred, and the original state of the universe can be obtained by reversing the process. If a process is not reversible, entropy is created and the disorder of the universe is increased. The entropy of the universe can never decrease.
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4 Entropy Entropy is a measure of the disorder in a system. Note that for a given process, the larger the heat flow the greater the increase in S. Also, that a given heat flow of a process causes a larger change in S at lower T’s. Also note that if a reversible process is adiabatic, it is isentropic.
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Lecture2-ThermoReview - Lecutre 2: Brief Review of...

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