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初中化学第2章第1～5节的教学,可使学生进一步获得学习元素及化合物的一些基本规律和方法。第4、5节是初中化学的3个分化点之一。因此这5节的教学至关重要。本文分节次谈谈教学点滴。第1节水通过讲解水在自然界的分布情况、与人类的关系以及预防和防止水源污染的重要性,说明水虽是宝贵的财富,但保护不好,又会危害人类。为调动学生的积极性,可简介自来水厂是如何净化水的。讨论水的组成是从电解水的实验开始的。
The teaching of Sections 1 to 5 of Chapter 2 of Junior Chemistry provides students with some basic rules and methods for learning elements and compounds. Sections 4 and 5 are one of the three differentiation points of junior high school chemistry. Therefore, the teaching in these 5 sections is of vital importance. This article is divided into sections to talk about teaching. In the first section, water explains the importance of the distribution of water in nature, the relationship with humans, and the prevention and prevention of water pollution. It shows that although water is a valuable asset, it is not well protected and will endanger humanity. In order to mobilize the enthusiasm of students, we can introduce how the water plant purifies water. Discussing the composition of water begins with the experiment of electrolyzing water.