Specially updated to include instant access to OWL, the only online learning system specifically designed to support mastery learning, this ENHANCED NINTH EDITION of GENERAL CHEMISTRY helps readers master quantitative skills and build a lasting conceptual understanding of key chemical concepts. The book creates a context for numerical problem solving and helps readers master the big ideas in each chapter through Concept Checks and Conceptual Problems, as well as Concept Explorations and Strategy Problems that challenge students to think step by step and not rush for a numerical answer.