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一、引言化学概念教学是初中化学教学中的关键组成部分~([1]),是学习化学的基础,化学知识体系的形成依赖于化学概念的正确构建~([2])。化学概念是化学现象、原理等感性知识归纳总结而成的理性知识~([3]),抽象、繁多,学生难以理解和掌握。微课短小精悍,以知识点为粒度单位~([4]),能更好地针对一个化学概念进行讲解。利用图文、视频、软件等将化学概念制作成微课,并使之系列化,能将疑难问题分解,符合学生的认知特点,满足学生碎片化学习的需要。微课,是以教学微视频为核心载体,基于一个学科
I. INTRODUCTION The teaching of chemical concept is a key part of junior high school chemistry teaching. It is the basis of learning chemistry. The formation of chemical knowledge system depends on the correct construction of chemical concepts. [2] The chemical concept is the rational knowledge that summarizes perceptual knowledge such as chemical phenomena and principles ~ ([3]). It is abstracted and numerous and difficult for students to understand and master. Micro-lectures lean, knowledge points for the granularity unit ~ ([4]), to better explain a chemical concept. The use of graphic, video, software and other chemical concepts into a micro-class, and make it serialized, difficult problems can be decomposed, in line with the cognitive characteristics of students to meet the needs of student fragmentation. Micro-class, is based on teaching micro-video as the core carrier, based on a discipline