Maintaining the clear and approachable writing style characteristic of author Karen Timberlake, Basic Chemistry with MasteringChemistry®, Fourth Edition, adds to its suite of problem-solving tools and techniques necessary for educational and workforce success. Engaging new features such as Key Math Skills and Core Chemistry Skills, and Math Review Modules allow students of various levels and learning styles to practice and master quantitative skills. Popular features, including “Combining Ideas” sections and end-of-chapter questions, have also been strengthened and expanded. Modern real-world applications help students connect chemical principles to events in their world, while stories involving careers illustrate the importance of chemistry in future careers. This new edition also expands the resources available in MasteringChemistry, the most widely used and effective online homework, tutorial, and assessment system for the sciences.