离子方程式的书写是中学化学的最基本内容之一,它不仅是一种书写技巧问题,面且涉及化学基本概念和基本理论,因而几乎是历年高考必考的试题.为了便于学生在复习中把握高考中对这一问题的考查方向,下面针对历年高考题归纳、分析书写离子方程式时应注意的一些问题.一、表示各物质 The writing of ion equation is one of the most basic contents of middle school chemistry. It is not only a writing skill problem, but also involves basic concepts and basic theories of chemistry. Therefore, it is almost a question that must be considered in the college entrance examination. It is to facilitate the students to grasp during the review. The examination direction of this issue in the college entrance examination is as follows: In the following, we should pay attention to some questions that should be noted when writing the ion equations in the previous college entrance examination questions.