基于学科大概念的初中化学单元教学——酸、碱、盐

Unit Teaching of Junior High School Chemistry“Acid,Alkali and Salt”Based on Subject Big Ideas

以建构学科大概念为核心,分析“酸、碱、盐”的教学现状,整合人教版九年级化学第十单元“酸和碱”和第十一单元“盐化肥”知识内容为一教学单元,建立“基于物质类别认识物质的性质与反应规律”这一学科大概念。本单元教学设计以探寻医药应用中的酸、碱、盐原理奥秘的主题活动为情境,利用元素守恒思路、微观探析活动发展学生的化学学科思维、树立学生的科学态度与社会责任感,充分彰显化学学科的育人价值。

With the construction of the subject big ideas as the core,this paper analyzes the current teaching situation of"acid,alkali and salt",integrates the knowledge contents of unit 10‘acid and alkali"and unit 11"salt and chemical fertilizer"of ninth grade chemistry of people's education edition as one unit,and establishes the concept of this discipline that"understanding the nature and reaction law of substances based on substance categories".The teaching design of this unit is based on the theme activity of exploring the mystery of the principle of acid,alkali and salt in medical applications.It uses the idea of conservation of elements and microscopic analysis activities to develop students'chemistry thinking,establish students'scientific attitude and sense of social responsibility,and fully demonstrates the education value of chemistry.