### Physical Chemistry Quiz Screencasts

Each screencast has at least one interactive quiz during the video. The description above each video provides a brief summary.

- How to Calculate Entropy Changes: Ideal Gases
- How to Calculate Entropy Changes: Liquids, Solids, and Phase Changes
- How to Calculate Entropy Changes: Mixing Ideal Gases
- Introduction to First Law: Closed System

**Description**: Derives equations to calculate entropy changes for an ideal gas as temperature and pressure change.

**Description**: Derives equations to calculate entropy changes for liquids and solids and for phase changes.

**Description**: Derives equation to calculate entropy change when ideal gases are mixed at constant temperature and pressure.

**Description**: Introduces the first law for a closed system and considers cases of constant pressure and constant volume.