“先学后教”的教学模式强调教学过程的主次性,要求学生要先预习、学习,把握知识,形成良好的学习习惯,再在课堂上由教师加以引导,更好地完成教学和学习任务。从当前教学模式的发展趋势来看,可以预见的是“先学后教”将成为日后的主流教学模式。原因在于,“教”与“学”是组成完整教学活动的两大节点,二者之间不存在主次关系。因此,对于初中化学教师而言,应当依托此种模式实现对学生化学知识学习状况的摸底, “The first to teach ” teaching mode emphasizes the primacy of the teaching process, require students to preview, learn, grasp the knowledge, the formation of good learning habits, and then in the classroom by the teacher to guide and better finish the teaching And learning tasks. From the current development trend of teaching mode, it is foreseeable that “before school ” will become the mainstream teaching mode in the future. The reason is that “teaching ” and “learning ” are the two major nodes that constitute a complete teaching activity, there is no primary and secondary relationship between the two. Therefore, junior high school chemistry teachers should rely on this model to achieve a thorough understanding of the status of students’ chemical knowledge,