一、设计理念本节课的教学是让学生对分子世界形成初步认知,帮助学生初步构建微观世界.对于初次接触分子世界的学生而言,教师要在知识教学时选取合适的引导方式.本教学设计中融入了四个教学活动辅助知识教学,透过四个在生活中经常看到的演示实验,不仅给学生直观呈现了分子的存在、运动规律等,也让学生对于理论知识更容易接受,从而达到教学目标.二、教学目标通过活动了解分子模型的主要内容,知道分子是保持物质化学性质的最小单元,对分子大小有一 First, the design philosophy The teaching of this lesson is to enable students to form a preliminary understanding of the molecular world to help students preliminarily build the micro-world for the first contact with the molecular world of students, teachers should choose appropriate guidance in the teaching of knowledge. Four teaching activities have been integrated into the design to assist knowledge teaching. Through four demonstration experiments often seen in life, students not only intuitively present the existence of molecules and their laws of movement, but also make students more receptive to theoretical knowledge. So as to achieve the teaching goal .Third, teaching objectives Through the activity to understand the main contents of the molecular model, know that the molecular is to maintain the minimum chemical and physical properties of the unit, the molecular size of a