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一教材分析1.教材的地位和作用质量守恒定律是初中化学的一个重要化学规律,是分析物质在化学反应中的质量关系的理论依据,它的应用贯穿于整个中学化学。本节教材在初中化学里有着承上启下的作用。在此之前,学生学习了元素符号、化学式、分子和原子的初步知识,对化学反应中物质发生的质的变化已经有了一定的认识。本节课的教学将引领学生对化学反应的认识开始了从“质”到“量”的过渡,也为之后化学方程式的书写和计算的教学构建了理论铺垫,所以本课内容不仅是本单元的
A textbook analysis 1. The status and role of teaching materials The law of conservation of mass is an important chemistry of junior high school chemistry, is the theoretical basis for the analysis of the quality of the material in chemical reactions, its application runs through the entire secondary chemistry. This textbook has a connecting role in junior high school chemistry. Prior to this, students learned the elementary knowledge of elemental symbols, formulas, molecules, and atoms and gained some understanding of the qualitative changes that took place in the chemical reactions. The teaching of this lesson will lead students’ understanding of chemical reactions to begin the transition from “quality ” to “quantity ”, and also paves the way for the subsequent teaching of chemical equation writing and calculation. Therefore, the content of this lesson Not only this unit