Enable deep conceptual understanding Conceptual Checkpoints reinforce conceptual understanding of the most complex material. Strategically placed throughout each chapter, they prompt students to think about concepts and solve problems without doing any math. Answers and explanations appear at the end of each chapter. The fifth edition includes more than 20 new Conceptual Checkpoints, focused on visualisations and drawing as requested by reviewers. These additions reinforce the program’s focus on helping students understand all relevant concepts. Key Learning Outcomes that correlate to the Chemical Skills and Examples in the end-of-chapter material. Chapter Self-Assessment Quizzes at the end of each chapter provide opportunities for students to assess what they’ve learned. Each quiz consists of 10–15 multiple-choice questions similar to those found on standard exams. 3-4 Questions for Group Wor k have been added to the end-of-chapter problems in each chapter to facilitate guided-inquiry learning both inside and outside the classroom. Multipart molecular images depicted through Macroscopic, Microscopic, and Symbolic perspectives enable students to better visualise, and thus understand, chemistry. These multipart images help students to see the relationships among the formulas they write down on paper (symbolic), the world they see around them (macroscopic), and the atoms and molecules that compose that world (molecular). Abundant molecular-level views reveal the connections between everyday processes visible to the eye and the activities of atoms and molecules. Extensive labels and annotations for each illustration direct students to key elements in the art and help them to understand the processes depicted. Three-part visual images include a photograph of a real-world object or process, a depiction of what is taking place on the molecular level (either superimposed or shown as a magnified breakout), and a representation using chemical formulas. This three-tiered view helps students to visualise and understand key concepts. In addition to structural formulas, many molecular formulas in the text are also depicted with molecular illustrations for greater clarity and vividness. In addition, macro/micro illustrations are included. Using a h ierarchical method of labeling images, Introductory Chemistry presents complex information clearly and concisely by making the relationships between related labels and annotations immediately evident to students. Coverage of atomic masses has been revised to reflect recent changes made by IUPAC that introduce more uncertainty in atomic masses. The program’s periodic table itself has been revised to reflect the recommended atomic masses for “unspecified samples,” including using the value of 32.06 amu for S and 6.94 amu for Li. Examples are presented in several formats that foster problem-solving skills and enable understanding. All but the simplest examples are presented in a two-column format. The left column acts as the instructor’s voice, explaining the purpose of each step, while the right column shows how the step is executed. This format encourages students to think critically about problem solving, and to view each step in the context of the overall plan. Specific procedures for solving particular types of problems are presented in a three-column format. The first column outlines the problem-solving procedure and explains the reasoning that underlies each step. The second and thi