论文部分内容阅读
在中学化学教学中,学生对酸、碱、盐的认识是建立在电离理论基础上的.酸、碱、盐都是电解质.溶于水电离出的阳离子全部都是H+的化合物是酸.而与酸的分类、性质相关的概念比较多,学生在学习过程中由于受前概念的影响,对概念的内涵和外延缺乏深层次理解,在运用过程中容易出现一些模糊认识.下面通过对酸的几组相关概念进行教学探讨,以便使我们对这类物质有更深刻的理解.一、酸性、氧化性和还原性在化学反应中,酸不仅可以表现出酸性,而且也常常表现
In chemistry teaching in middle school, the students’ understanding of acid, alkali and salt is based on the theory of ionization.Acid, alkali and salt are all electrolytes.All compounds that are soluble in water and have all H + In the process of learning, due to the influence of the preconception, the students lack of deep understanding of the connotation and extension of the concept, and some fuzzy understanding tends to appear in the process of application. Several groups of related concepts for teaching discussion, so that we have a more profound understanding of these substances.A acidic, oxidizing and reducing In chemical reactions, acid not only can show acidic, but also often show