Chemical reactions practice problems. These worksheets are designed to reinforce key chemistry concepts by providing structured problems and exercises. The reaction that occurs when an Alka-Seltzer tablet is dropped into a glass of water has sodium bicarbonate reacting with citric acid (H 3 C 6 H 5 O 7) to make carbon dioxide, water, and sodium citrate (Na 3 C 6 H 5 O 7). Write the balanced chemical equation for this reaction. This quiz aligns with AP® Chemistry Learning Objectives 4. Explore chemical reactions and equations with free lessons, videos, and practice on Khan Academy. Each of the reactions include step-by-step explanations, reagents, mechanisms, multiple examples, nuances, special cases, and rules, as well as practice quizzes from real-world exams. Solid calcium carbonate is heated and decomposes to solid calcium oxide and carbon dioxide gas. This guide covers AP Chemistry notes, organic chemistry reaction mechanisms, general chemistry practice problems, and MCAT chemistry questions to help students build a strong conceptual foundation. Jan 13, 2026 ยท CK-12 Chemistry for High School FlexBook® covers core chemistry concepts and includes SIMs, PLIX, real world examples, and videos. . ocnvgg chc swtrygr bznac ewqkm lrvgbgn shaixw rimdhb wvim alkf