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近来国外的中小学教育工作者,以极大的热情关注着使用身边易得的材料进行学生实验和演示实验的问题,这样做不仅可以加深学生对周围事物的深入理解,提高学习兴趣,扩大他们的知识面,而且也为学生课后自己在家动手和那些设备较差的学校提供实验条件,同时这样做也符合我国勤俭节约的时代精神。希望本文和以后编译的一些材料,能给读者以启迪。一、SO_2的还原作用(1) 目的:了解火柴燃烧后产生的刺激性气体是SO_2以及SO_2具有还原性和漂白作用。
Recently, foreign primary and secondary school educators have followed with great enthusiasm the use of readily available materials for student experiments and demonstration experiments. This will not only deepen students’ in-depth understanding of the surrounding things, increase their interest in learning, and expand their interest. The knowledge surface, but also for the students to teach themselves at home and those poorly equipped schools to provide experimental conditions, and at the same time to do so is also consistent with the spirit of our times and thrifty spirit. I hope that some of the materials compiled in this article and later will give the reader inspiration. I. Reduction of SO 2 (1) Objective: To understand that the irritating gases produced by combustible matches are SO 2 and SO 2 with reducing and bleaching effects.