摘要
基于结构与功能、转化与能量等大概念,对甜蜜分子木糖醇、葡萄糖的结构、性质与用途进行了单元教学设计与实施。以木糖醇(多羟基醇)和葡萄糖(多羟基醛)的鉴别创设情境,通过木糖醇发生银镜反应的实验事实激发学习兴趣,引导学生从基团间相互影响的角度构建多官能团有机物结构与性质的关系,预测并验证赤藓糖醇等饱和多元醇能否发生银镜反应;从性质决定用途的角度辩证地认识代糖,科学选择代糖产品。随后发展从位阻的角度,认识有机物中的极性不饱和键对物质性质、用途的决定作用。本单元教学发展了学生宏微结合、证据推理、模型认知及科学精神等学科核心素养,并以小组合作促进“教、学、评”一体化的达成。
Based on structure and function, transformation and energy, the unit teaching of structure, properties and applications of sweet molecules xylitol and glucose are designed and implemented. This unit teaching creates a situation based on the identification of xylitol and glucose, which stimulates students’ interest through the fact that xylitol has silver mirror reaction, and guides students to construct the relationship between the structure and properties of multi-functional organic compounds from the interaction between groups. The possibility of silver mirror reaction of erythritol and other saturated polyols is predicted and verified. The knowledge will promote students to dialectically understand sugar substitutes from the perspective that properties determine applications, and scientifically select sugar substitutes. Furthermore, the understanding of the decisive role of polar unsaturated bonds on the properties and uses of organic compounds from the perspective of steric hindrance is developed. This unit teaching develops students’ qualities such as macro micro combination, evidence reasoning, model cognition and scientific spirit, and promotes the integration of “teaching, learning and evaluation” through group cooperation.
作者
李茜
LI Qian(The Affiliated High School of Peking University,Beijing 100190,China)
出处
《化学教育（中英文）》
CAS
北大核心
2022年第23期61-66,共6页
Chinese Journal of Chemical Education
关键词
单元教学
大概念
核心素养
糖类
合作学习
unit teaching
big idea
core literacy
sugars
cooperative learning
