基于三重表征的离子反应教学设计

Instructional Design of Ionic Reactions Based on Triple Characterization

离子反应作为关键化学概念知识,标志着高中化学从微观角度认识水溶液中物质变化的起点。文章以离子反应为例,以“电离、离子反应等知识”为载体对离子反应进行教学设计。通过创设真实有效的情景,让学生直观感受宏观现象,并从微观视角解释酸、碱、盐在水溶液中的转化及微粒变化,进一步分析离子反应的本质及发生条件,最后以符号的形式表征整个过程。建立“宏—微—符”三重表征思维,有效提升核心素养。

As a key chemical concept,ionic reaction marks the starting point of high school chemistry to understand the substances and their changes in aqueous solutions from a microscopic perspective.In this paper,ionic reaction is taken as an example,and the teaching design of ionic reaction is carried out with “knowledge of ionization and ionic reaction” as the carrier.By creating real and effective scenarios,students can intuitively experience macroscopic phenomena,explain the transformation of acids,alkalis and salts in aqueous solutions and the changes of particles from a microscopic perspective,further analyze the nature and conditions of ionic reactions,and finally characterize the whole process in the form of symbols.We establish the “macro-micro-symbolic” triple representation thinking to effectively improve the core literacy.