The Fifth Edition's new coauthor Stacey Lowery Bretz, uses visualization tools—based on Chemistry Education Research and focused on the particulate nature of matter—to help students self assess what they know before, during, and after each chapter. Smartwork5 allows instructors to use this pedagogy as a diagnostic, and students receive hints and answer-specific feedback within the system. New ChemTour animations further support visualization at a molecular level and are integrated throughout the media package.