化学是一门以实验为基础的自然科学,根据国家课程计划,初中化学每周4节(有些地区3节)。沪教版九年级化学教材分上下两册共九章,259页。其中涉及的内容多,范围广,而且在短短的一年不到的时间中还要面临中考的挑战。因此,优化课堂 Chemistry is an experimental, science-based science that has four junior high school chemistry weekly (three in some regions) according to the national curriculum program. Shanghai Jiao Tong ninth grade chemistry textbook divided into two volumes a total of nine chapters, 259 pages. Which involves more content, a wide range, but also in less than a year's time to face the challenge of the entrance exam. Therefore, optimizing the classroom