Principles of Chemistry

Principles of Chemistry: A Molecular Approach, 4th Edition, by Nivaldo Tro, is a general chemistry textbook designed for two-semester college courses. The text establishes fundamental principles regarding chemical structures, quantitative reasoning, and molecular interactions.

The material progresses through early foundational topics, including matter, measurement, atomic structure, elements, molecules, and chemical quantities in aqueous solutions. Subsequent chapters address gases, thermochemistry, quantum-mechanical models, periodic trends, Lewis structures, valence bond theory, and molecular orbital theory. The remaining units examine states of matter, solutions, chemical kinetics, equilibrium systems, acid-base chemistry, free energy, electrochemistry, and radioactivity.

A defining feature of the 4th Edition is how it depicts core chemistry concepts through multi-level imagery across macroscopic, molecular, and symbolic scales. Integrated active learning tools engage students to build critical-thinking and problem-solving skills throughout each unit. This volume supports both students and chemistry instructors across a full two-semester curriculum.