基于建构化学基本观念的对比教学法——以“质量守恒定律”教学设计为例

Application of Contrast Teaching Method in Teaching of“Law of Conservation of Mass”Based on Construction of Basic Chemical Ideas

在质量守恒定律的教学中,将对比教学法巧妙地运用于史料知识、实验探究、数据分析中,有助于实现学生宏观表征从＂质＂到＂量＂的突破,微观表征从＂静＂到＂变＂的转化,符号表征从＂孤立＂到＂联系＂的完善,从而建立宏观-微观-符号表征之间的联系,学生对定律的认识在从模糊到清晰并臻于科学的过程中,构建物质变化观。

In the teaching of law of conservation of mass,the contrast teaching method was applied to the historical knowledge,experimental inquiry and data analysis.This method was helpful to students to understand from ＂quality＂to ＂quantity＂in macroscopic representation,from ＂static＂to＂change＂in microscopic representation,and from ＂isolated＂to ＂connection＂in symbolic representation,to establish the connection of triple representation,to grasp law of conservation of mass scientifically,and to construct the ideas of matter change.