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学习了氧气和化学方程式的初步知识后,为巩固氧气性质、实验室制法,使学生初步学会称量、加热、过滤、仪器组装等基本操作技术,初步培养学生实验方法、观察和分析能力,我结合课本“化学实验基本操作”的内容,组织了“用实验证明KMnO_4热分解产物是K_2MnO_4、MnO_2和O_2”的综合性课外活动,在教师的指导下进行。做法是: 1.布置讨论题 (1)查阅 KClO_3、KMnO_4、MnO_2、O_2、K_2MnO_4的重要性质(教师提示有关资料)。 (2)根据哪些性质证明O_2、MnO_2、K_2MnO_4的存在?
After learning the basic knowledge of oxygen and chemical equations, in order to consolidate the nature of oxygen and laboratory methods, students learn basic techniques such as weighing, heating, filtration, and instrument assembly, and initially train students’ experimental methods, observation and analysis capabilities. I combined the textbook “Basic Operation of Chemical Experiments” and organized a “comprehensive demonstration of the thermal decomposition products of KMnO_4 as K_2MnO_4, MnO_2, and O_2” in a comprehensive extracurricular activity conducted under the guidance of teachers. The approach is: 1. Arrange discussion topics (1) Check the important properties of KClO_3, KMnO_4, MnO_2, O_2, and K_2MnO_4 (teachers’ tips for relevant information). (2) According to which properties prove the existence of O_2, MnO_2, K_2MnO_4?