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初中化学的复习有三个难点:一是基本概念、基本理论,主要指一、二章的知识;二是溶液一章,溶质和溶液关系复杂,不易理清;三是第五章,如何运用反应规律解决实际问题。1 基本概念、基本理论 初中化学第一、三章的特点是概念多、符号多,黑体字概念有四十多个,元素符号三十多个,由它们组成的分子式、化学方程式则已无法用数字统计,要完成这样多的任务,应该在两个字上多下功夫,即多“记”和多“练”。
The review of junior high school chemistry has three difficulties: First, the basic concepts, basic theory, mainly refers to the knowledge of chapter one, two chapters; two is the solution chapter, the relationship between solute and solution is complex, difficult to sort out; Third, the fifth chapter, how to use the reaction Law to solve practical problems. 1 Basic Concepts and Basic Theories The characteristics of the first and third chapters of junior middle school chemistry are many concepts, many symbols, more than 40 concepts of bold characters, and more than 30 element symbols. The molecular formulas and chemical equations formed by them are no longer usable. Digital statistics, to complete such a large number of tasks, should make more efforts in the two words, namely more “remember” and more “training.”