基于模型认知的“价层电子对互斥理论”学习进阶设计

Progressive Learning Design of VSEPR Theory Based on Model Cognition

遵循学生认知发展的客观规律,以及化学学科核心素养“模型认知”由低到高的水平划分,借助PhET互动仿真模型平台,通过虚拟的分子模型搭建和真实的分子构型对比,将“成键电子”“孤对电子”和“价层电子对”等抽象知识,融入认识模型、理解模型、运用模型和建构模型的递进式学习进阶设计中,在促进学生对互斥行为深度理解的同时,避免了虚拟可视化模型的过度类比可能导致的“相异构想”。

According to the objective law of students’cognitive development and the requirement of“model cognition”of core literacy of chemistry discipline from low to high level,the design of“recognition model,understanding model,application model and construction model”,has been carried out in comparison of virtual molecular model construction and real molecular configuration by using PhET interactive simulation model platform.Concepts of bonding,lone pair and valence electrons are integrated into the intuitive and game-based advanced learning step by step,which is expected to promote students in understanding mutually exclusive behavior in depth,and avoid the over analogy of virtual visualization model for“different ideas”.