“物质的量”是化学中的一个很重要的基本概念,被广泛的应用于工农业生产和科学研究领域.在中学化学中学习这部分知识,会使学生进一步理解微观粒子与宏观物质之间的关系,培养学生化学计算技能和实验技能都有十分重要的意义.本章概念较多,理论性强而且都很抽象,在学习时应尽量将抽象的概念形象化,恰当的把握好教材的深广度,以适应新教材、新大纲的要求.因此在学习过程中要恰当处理好以下几个问题. “Quantity of matter” is a very important basic concept in chemistry and it is widely used in industrial and agricultural production and scientific research. Learning this part of the knowledge in middle school chemistry will enable students to further understand the relationship between microscopic particles and macroscopic matter. The relationship between developing students’ chemistry calculation skills and experimental skills has very important significance. This chapter has many concepts, strong theoretical and abstract, and we should try to visualize the abstract concepts while learning, and properly grasp the depth of teaching materials. Breadth to adapt to the requirements of new textbooks and new programs. Therefore, we must properly handle the following issues in the learning process.