The main goals of this text are to develop students' appreciation for the molecular world and stress the fundamental role it plays in our daily lives. It also strives to help students understand the major scientific, technological, and environmental issues affecting our society. To accomplish these goals, the author has made extensive efforts to clearly identify and explain connections between the molecular world and macroscopic world as well as between principles and applications. The Third Edition of CHEMISTRY IN FOCUS adds new pedagogy and technological resources, such as OWL for Liberal Arts, that further enhance learning and appreciation of the molecular world.