Book excerpt: UNLOCK THE SECRETS OF CHEMISTRY with THE PRINCETON REVIEW. High School Chemistry Unlocked focuses on giving you a wide range of key lessons to help increase your understanding of chemistry. With this book, you'll move from foundational concepts to complicated, real-world applications, building confidence as your skills improve. End-of-chapter drills will help test your comprehension of each facet of chemistry, from atoms to alpha radiation. Don't feel locked out! Everything You Need to Know About Chemistry. • Complex concepts explained in straightforward ways • Walk-throughs of sample problems for all topics • Clear goals and self-assessments to help you pinpoint areas for further review • Guided examples of how to solve problems for common subjects Practice Your Way to Excellence. • 165+ hands-on practice questions, seeded throughout the chapters and online • Complete answer explanations to boost understanding • Bonus online questions similar to those you'll find on the AP Chemistry Exam and the SAT Chemistry Subject Test High School Chemistry Unlocked covers: • Building blocks of matter • Physical behavior of matter • Chemical bonding • Chemical reactions • Stoichiometry • Solutions • Acids and bases • Equilibrium • Organic chemistry • Radioactivity ... and more!