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Stay on current Cengage site**OWLv2** is a powerful online learning system for Chemistry with richly dynamic problems, interactive learning modules, and other resources to help students move beyond memorization to higher level thinking.

This fully updated Eighth Edition of CHEMICAL PRINCIPLES provides a unique organization and a rigorous but understandable introduction to chemistry that emphasizes conceptual understanding and the importance of models. Known for helping students develop a qualitative, conceptual foundation that gets them thinking like chemists, this market-leading text is designed for students with solid mathematical preparation. The Eighth Edition features a new section on "Solving a Complex Problem" that discusses and illustrates how to solve problems in a flexible, creative way based on understanding the fundamental ideas of chemistry and asking and answering key questions. The book is also enhanced by an increase of problem-solving techniques in the solutions to the Examples, new student learning aids, new ‘Chemical Insights” and “Chemistry Explorers” boxes, and more.

1. Chemists and Chemistry.

2. Atoms, Molecules, and Ions.

3. Stoichiometry.

4. Types of Chemical Reactions and Solution Stoichiometry.

5. Gases.

6. Chemical Equilibrium.

7. Acids and Bases.

8. Applications of Aqueous Equilibria.

9. Energy, Enthalpy, and Thermochemistry.

10. Spontaneity, Entropy, and Free Energy.

11. Electrochemistry.

12. Quantum Mechanics and Atomic Theory.

13. Bonding: General Concepts.

14. Covalent Bonding: Orbitals.

15. Chemical Kinetics.

16. Liquids and Solids.

17. Properties of Solutions.

18. The Representative Elements.

19. Transition Metals and Coordination Chemistry.

20. The Nucleus: A Chemist’s View.

21. Organic and Biochemical Molecules.

Appendix 1. Mathematical Procedures.

Appendix 2. Units of Measurement and Conversions Among Units.

Appendix 3. Spectral Analysis.

Appendix 4. Selected Thermodynamic Data.

Appendix 5. Equilibrium Constants and Reduction Potentials.

Appendix 6. Deriving the Integrated Rate Laws.

Glossary.

Answers to Selected Exercises.

- ChemWork problems have been added to the end-of-chapter problems throughout the text and can be worked in OWLv2 or with pencil and paper. Students who need help with core concepts from each chapter can get assistance through a series of online hints in OWLv2—usually in the form of interactive questions that guide students through the problem-solving process.
- In Chapters 3-5, the discussion of how to use the problem-solving approach in the examples was increased to model for students the types of questions they should be asking and answering when solving problems.
- Section 3.4 “Conceptual Problem Solving” has been expanded to increase the emphasis on the importance of having students think their way through a problem.
- A new section, Section 3.11, “Solving a Complex Problem,” has been added. In this new section, the authors discuss at length a complex problem (that is, one which requires the students to utilize knowledge and understanding of many concepts). Alternative solutions are also considered to show students that there is always more than one method to solve a complex problem.
- Section 10.1 includes a more rigorous discussion of the mathematics involved in relating the number of microstates to the concept of entropy.

- Unique Organization: The authors cover equilibria and acid-base chemistry early and delay coverage of atomic theory and bonding until the second half of the text. The text includes sections on Exact Treatment of Buffered Solutions (Chapter 8), Adiabatic Processes (Chapter 10), and Molecular, Rotational, Vibrational, Electronic, and Nuclear Magnetic Spectroscopy (Chapter 14). These sections provide more depth at a slightly more rigorous level, consistent with the book’s overall focus.
- Section 3.4 "Learning to Solve Problems" emphasizes the importance of conceptual problem solving by showing students how to think their way through a problem. This section discusses how to solve problems in a flexible, creative way based on understanding the fundamental ideas of chemistry and asking and answering key questions. Students will learn that this "big picture approach" produces more long term, meaningful learning rather than simply memorizing specific steps that are easily forgotten.
- Chemical Insights Boxes. These boxes showcase various applications and topics and their relationship to the field of chemistry.
- Chemistry Explorer Boxes. These boxes profile chemistry professors who currently are pioneering research in their fields and introduce students to today’s role models in chemical research.
- Mathematical Support. All mathematical operations required for the text are conveniently described in an Appendix or are illustrated in worked-out examples. Knowledge of calculus is not required, and differential and integral notations, used only where absolutely necessary, are accompanied by explanations.
- In-text and Online ChemWork Exercises: ChemWork assignments developed by Steven and Susan Zumdahl coach students through the process of becoming independent problem solvers. Available online within OWLv2, ChemWork exercises provide students with challenging problems and hints for practicing concepts from the chapter.

**Steven S. Zumdahl**

University of Illinois, Urbana-Champaign

Steve Zumdahl is the author of market-leading textbooks in introductory chemistry, general chemistry, honors-level chemistry, and high school chemistry. Recently retired from his long-time position as Director of Undergraduate Programs at the University of Illinois, he has received numerous awards for his contributions to chemical education. These include the National Catalyst Award in recognition of his contribution to chemical education, the University of Illinois Teaching Award, the UIUC Liberal Arts and Sciences Advising Award, and the School of Chemical Sciences Teaching Award (five times). He earned his B.S. in Chemistry from Wheaton College (IL), and his Ph.D. from the University of Illinois.

**Donald J. DeCoste**

University of Illinois, Urbana-Champaign

Donald J. DeCoste is Associate Director of General Chemistry at the University of Illinois, Urbana–Champaign and has been teaching chemistry at the high school and college levels for 26 years. He earned his BS in Chemistry and PhD from the University of Illinois, Urbana–Champaign. At UIUC he has developed chemistry courses for nonscience majors, preservice secondary teachers, and preservice elementary teachers. He teaches courses in introductory chemistry and the teaching of chemistry and has received the School of Chemical Sciences Teaching Award four times. Don has led workshops for secondary teachers and graduate student teaching assistants, discussing the methods and benefits of getting students more actively involved in class. When not involved in teaching and advising, Don enjoys spending time with his wife and three children.

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