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初中化学教学是化学的启蒙阶段,某些基础知识不能讲解得过于绝对,因为知识本身就需要持续更新。教师在教学过程中不能模糊处理某些知识点而让学生死记硬背,应该细化分析过程,以培养学生的思辨能力。一、关于CO_2的收集方法初中阶段,有关CO_2的收集方法的试题的几乎都源自于人教版义务教育教科书《化学(九年级)上册》课题2的“练习与应用”中的习题,即认为“收集CO_2的方法是向上排空气法,因为CO_2的密度比空气的大”。部分
Chemistry teaching junior high school chemistry is the enlightenment phase, some of the basic knowledge can not explain too much, because knowledge itself needs to be continuously updated. Teachers in the teaching process can not obfuscate some points of knowledge and let students rote, you should refine the analysis process to develop students’ ability to think. First, on the CO_2 collection method In the junior high school stage, almost all of the questions about the CO_2 collection method originated from the exercises in “Practice and Application” of Question 2 of the textbook “Chemistry (Grade 9)” in the PEP , That is, “The method of collecting CO_2 is to move the air upward, because CO_2 is denser than air.” section