The AP Chem Solutions app provides deeper explanations of the concepts covered in the lesson slides for all 37 lectures. The new edition also has two multiple choice practice tests for each unit with detailed explanations of the concepts and procedures that are necessary to solve each question. This app is an excellent resource to help you rebuild and strengthen your knowledge of content when studying for tests and reviewing for the AP Chemistry Exam. If you are absent from school, you can still learn everything you missed with this app!