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本章教材内容比较多,而且是理论性问题较为集中的一章,通过本章学习是要使同学初步地建立起这样的概念,即:①化合与分解反应的概念;②原子是真实存在的,它是组成分子的微粒,并得到关于原子量和分子量的知识;③理解元素、单质、化合物的概念;④在掌握化学基本定律的基础上进一步理解分子式及化学方程式的含义。这就是本章的讲授任务,这个任务的确是繁重的,但是由于本章的系统性很强,各节间有机地联系着,所以学生在接受上尚无多大困难。本章从分解反应一节揭露了分子结构的本质。通过氧化汞分解一例,明显地说明了物质是可分的。由于在第一章中认识了物质由分子构成,所以就可从此建立起分子可
The content of this chapter is more teaching materials, but also a more focused theoretical issue chapter, through this chapter is to enable students to initially establish such a concept, namely: ① chemical and decomposition reaction concept; ② atomic is real, it Is the composition of the particles and get knowledge about the atomic weight and molecular weight; ③ understand the concept of elements, elements, compounds; ④ master the basic laws of chemistry to further understand the meaning of formulas and chemical equations. This is the task of teaching in this chapter. This task is really heavy. However, because of the systematic nature of this chapter and the links among the sections, there is no difficulty for students in accepting them. This chapter explores the nature of the molecular structure from the section on decomposition. A case of mercury oxide decomposition clearly shows that the material is separable. Since we know that matter is composed of molecules in the first chapter, we can establish the molecular