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作为中学化学教师,应该把培养学生如何运用化学知识贯穿于整个教学中.下面谈谈我的具体做法.我在讲“自燃”这部分知识时,通过演示实验:把试纸用白磷的二硫化碳溶液浸湿,取出晾干,过一段时间,这张试纸不经点火就燃烧起来.从而,使学生了解了“自燃”是可燃物发生缓慢氧化反应,积温到其着火点而引起的燃烧,并不是什么“天火”和“神火”,而是一种自然现象.在这里,除培养学生的唯物主义观点外,同
As a middle school chemistry teacher, students should be taught how to use chemistry knowledge throughout the entire teaching process. Let me talk about my specific practice. When I talk about the “spontaneous combustion” part of my knowledge, I will use a demonstration experiment to dip the test paper with a white phosphorous solution of carbon disulfide. Wet, dry out, and after some time, the test strip burned without ignition. As a result, students learned that “spontaneous combustion” is a slow oxidation reaction of combustibles, and that the accumulated temperature rises to the point of ignition and does not result in “burning”. “Tian Huo” and “Shen Huo” are natural phenomena. Here, apart from cultivating students’ materialistic views, the