The fifth edition's new co-author Stacey Lowery Bretz, uses visualisation 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 visualisation at a molecular level and are integrated throughout the media package.