This text explores the the fundamental principles of chemical phenomena including thermodynamics, equilibria and states of matter, and chemical kinetics. Front Matter 1: Systems and Variables 2: Zeroth Law of Thermodynamics 3: First Law of Thermodynamics 4: Thermochemistry 5: Thermodynamic Cycles 6: Second Law of Thermodynamics 7: Calculation of Entropy and the Third Law of Thermodynamics 8: Thermodynamic Potentials 9: Gibbs Free Energy 10: Chemical Equilibrium 11: Ideal and Non-Ideal Gases 12: Phase Equilibrium 13: Multi-Component Phase Diagrams 14: Properties of Solutions 15: Chemical Kinetics 16: The Motivation for Quantum Mechanics 17: Classical Mechanics 18: The Schrödinger Equation 19: Analytically Soluble Models 20: The Hydrogen Atom 21: Operators and Mathematical Background 22: Spin 23: Postulates of Quantum Mechanics 24: Quantum Weirdness 25: Many-Electron Atoms 26: Introduction to Molecules 27: The Chemical Bond in Diatomic Molecules 28: The Chemical Bond in Polyatomic Molecules 29: Spectroscopy 30: Appendix Back Matter