materials-chemistrylisted

# Materials Chemistry How matter behaves — its phase, its response to temperature and pressure, its interactions with the atmosphere, and whether its production harms or heals the environment — is the domain of materials chemistry. This skill connects the microscopic world of molecules and intermolecular forces to the macroscopic behavior of substances, the chemistry of Earth's atmosphere, and the design of sustainable chemical processes. **Agent affinity:** franklin (materials/applied chemistry, primary) **Concept IDs:** chem-states-of-matter, chem-atmospheric-chemistry, chem-green-chemistry ## States of Matter ### The Four States | State | Particle arrangement | Particle motion | Shape | Volume | Compressibility | |---|---|---|---|---|---| | Solid | Fixed, ordered lattice | Vibration only | Fixed | Fixed | Nearly zero | | Liquid | Close but disordered | Slide past each other | Container shape | Fixed | Very low | | Gas | Far apart, random | Rapid, random | Container shape | Container volume | High | | Plasma | Ionized gas | Extremely rapid | Container shape | Container volume | High | **Kinetic molecular theory (KMT) for gases:** 1. Gas particles are in constant, random motion. 2. The volume of individual particles is negligible relative to the container. 3. No attractive or repulsive forces between particles. 4. Collisions are perfectly elastic (kinetic energy is conserved). 5. Average kinetic energy is proportional to absolute temperature: KE_avg = (3/2)kT. Assum