化学方程式的有关计算是初中化学教学中重要内容之一。按照大纲和教材的要求,主要让学生掌握三种计算类型,即:基本类型、选择已知量类型和差量法类型。我在教学中,针对各类型的计算特点,设计出几道程序式习题,运用习题引导学生定向思维,逐步深化,使其在已占有知识的基础上,通过演算,达到知识的迁移。具体设计如下: The calculation of the chemical equation is one of the important contents in junior middle school chemistry teaching. According to the requirements of the outline and the teaching materials, the students are mainly allowed to grasp three types of calculations, namely: basic types, selection of known quantity types, and difference method types. In my teaching, I designed several procedural exercises for each type of computing characteristics, guided my students’ directional thinking through exercises, and gradually deepened them so that they could transfer their knowledge on the basis of possessed knowledge and through calculations. The specific design is as follows: