Ace Education Book Series aims at giving detailed material in the simplest way to help students understand and recall information easily. The books also highlight the importance and application of each topic in real life so that students can understand why they are learning the material, how the material relates to or can be used in real life. Ace Education Chemistry O'level consists of 19 units. Each unit begins with the introduction and overview of the unit, and ends with the review questions and solutions. To fully benefit, students are advised to cover everything in each unit considered. Students can also learn more from our social media platforms. On these platforms, students can find additional information, ask questions or participate in helping other students. With full confidence, this book will help a number of students, not just by boosting their scores, but also to understand Chemistry Ordinary Level.