一、前言笔者有幸观摩了山东省茌平县杜郎口中学一堂初中化学展示课,教学内容是《化学式相对分子质量》。学生学习热情高涨,态度积极,任参观者穿梭,却丝毫动摇不了对学习的专注。因此,笔者认为非常有必要将这堂化学展示课实施小组合作教学的情况呈现于广大同行面前,以期达到共享、共商之目的。杜郎口中学经近 I. Preface I was fortunate enough to observe a junior high school chemistry demonstration class at Du Lang Kou High School in Chiping County, Shandong Province. The content of the teaching is “Chemical Molecular Weight”. Students enthusiasm for learning, positive attitude, any visitors shuttle, but the slightest shake the focus on learning. Therefore, I think it is very necessary to present this group of chemical demonstration class teaching team co-operation presented in front of the majority of peers in order to achieve the purpose of sharing, discussing. Du Lang mouth secondary school by the near