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My goal with this book is not to make you into a chemistry major. My goal is simply to give you an understanding of some basic chemical topics that commonly appear in high school or college introductory chemistry courses. If you’re taking a course, use this book as a reference in conjunction with your notes and textbook. Simply watching people play pickleball, no matter how intently you watch them, will not make you a pickleball star. You need to practice. And the same is true with chemistry. It’s not a spectator sport. If you’re taking a chemistry course, then you need to practice and work on problems. I show you how to work certain types of problems — gas laws, for example — but use your textbook or 1001 Practice Problems For Dummies for practice problems. It’s work, yes, but it really can be fun. As I updated this third edition of Chemistry For Dummies, I reflected on what to include. I’ve enjoyed getting emails from people all over the world asking questions about the first and second editions or thanking me. However, looking at the overall feedback, I felt that I hadn’t quite concentrated enough on calculations and some other topics that students taking a college or high school-level class really needed. So, in this third edition I beefed up the calculations a little and included some extra topics normally found in the first year of high school chemistry or the first semester of general chemistry in college. Overall, this edition will be more useful to those of you taking a chemistry course. For those of you who want some help with second-semester topics, I can highly recommend my Chemistry II For Dummies.