**Episode 5: The Thermodynamics of Change**

**Theme: Phase Transitions, Chemical Potentials, and the Driving Forces of Transformation.**

**I. Introduction: The Spontaneity of Matter**

* **The Big Question:** Why does ice melt, water boil, or a battery discharge?

* **The Governing Principle:** Every system evolves toward the equilibrium state that **minimizes its active thermodynamic potential** (usually Gibbs Free Energy, G, at constant T and P).

* **Defining the Drivers:** Introducing **Chemical Potential** (mu) as the fundamental driving force for mass transfer and chemical change.

**II. Phase Equilibria: The Stability of States**

* **Defining a Phase:** A region of matter with uniform physical and chemical properties.

* **Criteria for Phase Equilibrium:** For two phases to coexist w ...