离子方程式是中学化学备考的重要内容,也是中学化学教学的重点和难点,它涉及面较广,头绪繁杂,是中学化学教学中的一个分化点,本文拟将中学化学教学中离子方程式归为五类,并对各类书写技巧进行简析。一、定量型所谓定量即给出参加反应的两种主要物质的定量关系,按定量关系书写离 The ion equation is an important part of middle school chemistry preparation. It is also a key and difficult point in chemistry teaching in middle schools. It involves a wide range of subjects and is a differentiating point in chemistry teaching in middle schools. This paper intends to classify the ion equation in middle school chemistry teaching as five. Classes, and a brief analysis of various writing techniques. First, the quantitative type of so-called quantification that gives the quantitative relationship between the two main substances participating in the reaction, according to the quantitative relationship written from