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氧化——还原反应是中学阶段份量重、难度大的学习内容,历届学生对这部分内容在学习时都感到比较困难。笔者认为可以从以下几个方面进行教学。 一、用简单的典型实例搞清概念,用教材中较为复杂的氧化还原实例进行练习。 初三学习氧化还原时,只举了Cu十0_2,Na+Cl_2,Fe_2O_3+CO三个反应实例,高一教材学习氧化还原反应时,只举了Na+Cl_2,H_2+Cl_2,Cu+Cl_2,Mg+Cl_2等四个简单的反应实例,可利用这些简单的实例搞清氧化还原的基本概念,联系已学过的较为复杂的氧化还原反应,如KClO_3和KMnO_4的分解、Ca(OH)_2+Cl、MnO_2+HCl等反应。进行练习可加深对
Oxidation-reduction is a heavy-weighted and difficult-to-learn content in the middle school. Previous students have had difficulty learning this part of the content. The author believes that teaching can be conducted from the following aspects. First, use simple typical examples to clarify concepts and use the more complex redox examples in the textbooks to practice. In the third year of learning redox, only three examples of Cu 10_2, Na+Cl_2, and Fe_2O_3+CO were cited. When the textbook was used to learn the redox reaction, only Na+Cl_2, H_2+Cl_2, and Cu+Cl_2 were cited. Four simple examples of reaction such as Mg+Cl 2 can be used to understand the basic concepts of redox, and link with the more complicated redox reactions that have been learned, such as the decomposition of KClO 3 and KMnO 4 , Ca(OH) 2+ Cl, MnO 2 + HCl and other reactions. Practice exercises can deepen