复分解反应是九年级学生学习了化合、分解、置换反应基础上的又一反应类型。在酸、碱、盐的性质学习中,酸、碱、盐溶液间的反应一般都是复分解反应,学生往往被众多的化学反应弄得稀里糊涂的,物质间能不能反应,不能正确判断;要求写化学反应却不明所以,导致很多学生因此失去了学习化学的信心。所以,它是九年级学生学习的重点又是难点。为了扭转这种局面,我在教学中特别注意分解难点,依据复分解反 Metathesis reaction is a ninth-grade students to learn the chemical reaction, decomposition, replacement reaction based on another reaction type. In the study of the properties of acids, bases and salts, the reactions between acids, alkalis and salt solutions are generally metathesis reactions. Students are often confused by a large number of chemical reactions and can not react with each other and can not judge correctly. The chemical reaction is unknown. As a result, many students have lost their confidence in learning chemistry. Therefore, it is the ninth grader’s focus and difficulty. In order to reverse this situation, I pay special attention to the difficulty of decomposition in teaching, based on the double decomposition