基于价态分析的化学核心概念探究性教学——氧化剂和还原剂  

Teaching of Chemical Core Concepts Based on“Valence Analysis and Scientific Inquiry”:Oxidant and Reductant

作　　者：温美凤 陈谦明 钱扬义[3] WEN Mei-Feng;CHEN Qian-Ming;QIAN Yang-Yi(Guangdong Panyu Middle School,Guangzhou 511400,China;Guangzhou Panyu District Teacher Training School,Guangzhou 511400,China;College of Chemistry,South China Normal University,Guangzhou 510006,China)

机构地区：[1]广东番禺中学,广东广州511400 [2]广州市番禺区教师进修学校,广东广州511400 [3]华南师范大学化学学院,广东广州511400

出　　处：《化学教育（中英文）》2023年第13期36-42,共7页Chinese Journal of Chemical Education

基　　金：2022年度广东省教育科学“十四五”规划课题“基于手持技术数字化创新实验的混合式教学范式的实践研究——以高中化学大单元教学为例”(课题编号:2022YQJK008)。

摘　　要：在教学实践中,学生在判断哪些物质具有氧化性、哪些物质具有还原性方面存在困难,以及较难理解同一物质既能做氧化剂又能做还原剂,到底什么时候表现出何种性质。针对此现象,本教学设计提出核心元素-化合价二维图,帮助学生理解氧化剂和还原剂概念的本质,建立起元素化合价与物质氧化性、还原性的关系;并通过科学探究过程,培养学生在陌生情境中运用本节课所学知识,进行物质氧化性、还原性预测与验证的关键能力,巩固本节课所学的规律。本节课教学效果良好,有效地突破了概念教学的难点,帮助学生建立起价态观,发展了学生的科学探究素养。In teaching practice,students have difficulty in judging which substances have oxidation or reduction;and it is difficult to understand when the same substance can be used as both oxidant and reductant.In view of this phenomenon,this teaching design puts forward the core element-valence two-dimensional diagram,to help students understand the essence of oxidant and reductant concepts,build the relationship between the valence of elements and the oxidation and reduction of substances.And through the process of scientific inquiry cultivate students'key ability to use the knowledge learned in this class to predict and verify the oxidation and reduction of substances in unfamiliar situations to consolidate the rules learned in this lesson.The teaching effect of this class is good,which effectively breaks through the difficulties of concept teaching,helps students establish the starting price view,and develops students'scientific inquiry literacy.

关 键 词：氧化剂和还原剂 概念教学 价态分析 科学探究 核心元素-化合价二维图 

分 类 号：G633.8[文化科学—教育学]