核心素养导向下的科学概念教学——以“氧化还原反应”为例

Core Literacy-Oriented Teaching of Scientific Concept:Oxidation-Reduction Reaction

“氧化还原反应”是化学学科的核心概念。氧化还原反应理论是对微观粒子发生变化的认识,其学习过程应从化学反应的宏观现象出发辨识物质种类,借助反应物微观粒子模型和生成物微观粒子模型探析粒子变化,从而得出发生氧化还原反应时反应物中原子是如何转化成生成物中原子的,通过分析典型反应对氧化还原反应本质有清晰的认识之后,可不直接研究反应,而间接分析化学方程式得出反应物到生成物是否有电子的转移。

Oxidation-reduction reaction is the core concept of chemistry.The theory of oxidation-reduction reaction is the understanding of the change of microscopic particles.During the learning process,it’s necessary to identify the types of substances by studying chemical reactions from the macroscopic perspective.By studying the change of particles with the help of the microscopic modeling of reactants’particles,as well as the microscopic modeling of derivatives’particles,we come to know how atoms of the reactants are converted into atoms of the derivatives when an oxidation-reduction reaction occurs.After analyzing typical reactions and having a clear understanding of the nature of oxidation-reduction reaction,instead of directly studying the reaction,we can indirectly analyze the chemical reaction equation to find out if there’s any transfer of electrons from the reactants to the derivatives.