文章从学生已有的CO2知识引出新课内容——氯水微粒种类,学生通过实验探究学习了氯水的性质,讨论分析了氯水中所含微粒,并将所学知识运用到生活实际中。在此过程中,学生亲身体验科学探究的过程,经历了“宏观认识”到“微观理解”的认知过程,感受化学知识在生产、生活中的实际应用。 In this paper, we introduce the content of the new course - chlorine water particles from the students’ existing CO2 knowledge. The students studied the nature of chlorine water through experiments and discussed the analysis of the particles contained in chlorine water, and applied the knowledge to the practical life. In this process, students experience the process of scientific inquiry and experience the cognitive process of “macro understanding” to “micro understanding” and experience the practical application of chemical knowledge in production and daily life.