CHEMISTRY PRINCIPLES ENHANCED EDITION has been specially updated to include instant access to ENHANCED WEBASSIGN, the most widely-used and reliable homework system. Also, as an added bonus, the Start Smart Guide has been bound into this book. This guide contains instructions to help users learn the basics of WebAssign quickly. This market-leading book meets the rapidly changing instructional demands of General Chemistry professors. Known for its carefully developed, thoroughly integrated, step-by-step approach to problem solving, General Chemistry helps users master quantitative skills and build a lasting conceptual understanding of key chemical concepts. The Ninth Edition retains this hallmark approach and builds upon the conceptual focus through key new features and revisions.