化学计算是中学化学教学的重要组成部分。学生对这部分内容常常感到类型多变、无规可循。其原因是概念不清、思路僵化。怎样引导学生联系双基、拓宽思路、灵活运用、举一反三。这是教师值得探究的重要课题。本文拟从运用当量定律解化学计算题的角度,谈几点肤浅的体会,仅供同志们参考。一、知识的结构化是运用当量定律的基础:知识的结构化就是将许多相互关联的知识组成网络,融会贯通。这样经过整理的系统知识,学生容易理解记忆。解化学计算题时往往可以从中找出思路、顺藤摸瓜、左右逢源、事半功倍。因此知识的结 Chemical calculation is an important part of chemistry teaching in middle school. Students often feel that this type of content is variable and irregular. The reason is that the concept is unclear and the thinking is rigid. How to guide students to contact the double-base, broaden their thinking, use it flexibly, and give an analogy. This is an important issue for teachers to explore. This article intends to discuss some superficial experiences from the perspective of using the law of equivalents to solve chemical calculation problems and is for reference only by comrades. First, the structuring of knowledge is the basis for applying the law of equivalents: The structuring of knowledge is the synthesis of many interconnected knowledge networks. After this sort of system knowledge, students can easily understand memories. When solving a chemical calculation problem, you can often find ideas, follow things, get on with each other, and do more with less. So the knowledge of the knot