Chemistry 9th Edition

Book Preface

Features of Chemistry, Ninth Edition

Conceptual learning and problem solving are fundamental to the approach of Chemistry. For the Ninth Edition, we have extended this emphasis by beginning the problem-solving approach in Chapter 1 (rather than Chapter 3 as in the Eighth Edition) to assist students as they learn to use dimensional analysis for unit conversions. Our philosophy is to help students learn to think like chemists so that they can apply the process of problem solving to all aspects of their lives. We give students the tools to become critical thinkers: to ask questions, to apply rules and models, and to evaluate the outcome.

It was also our mission to create a media program that embodies this philosophy so that when instructors and students look online for either study aids or online homework, each resource supports the goals of the textbook—a strong emphasis on models, real-world applications, and visual learning.

What’s New

We have made extensive updates to the Ninth Edition to enhance the learning experience for students. Here’s what’s new:
❯ A new emphasis has been placed on systematic problem solving in the applications of dimensional analysis.
❯ Critical Thinking questions have been added throughout the text to emphasize the importance of conceptual learning.
❯ Interactive Examples have been added throughout the text. These computer-based examples force students to think through the example step-by-step rather than simply scan the written example in the text as many students do.
❯ ChemWork problems have been added to the end-ofchapter problems throughout the text. These problems test students’ understanding of core concepts from each chapter. Students who solve a particular problem with no assistance can proceed directly to the answer. However, students who need help can get assistance through a series of online hints. The online procedure for assisting students is modeled after the way a teacher would help with homework problems in his or her office. The hints are usually in the form of interactive questions that guide students through the problem-solving process. Students cannot receive the correct answer from the computer; rather, it encourages students to continue working though the hints to arrive at the answer. ChemWork problems in the text can be worked using the online system or as pencil-and-paper problems.
❯ New end-of-chapter questions and problems have been added throughout the text.
❯ The art program has been modified and updated as needed, and new macro/micro illustrations have been added.
❯ In Chapter 3 the treatment of stoichiometry has been enhanced by the addition of a new section on limiting reactants, which emphasizes calculating the amounts of products that can be obtained from each reactant. Now students are taught how to select a limiting reactant both by comparing the amounts of reactants present and by calculating the amounts of products that can be formed by complete consumption of each reactant.
❯ A section on photoelectron spectroscopy was added to Chapter 9 (Section 9.6).