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初中课本《化学》第四章第四节“氧化—还原反应”的内容,在初三化学教学中既是重点又是难点。 这时学生已经学过氧气和氯气的性质,初步掌握了氧化反应的概念,又学过氢气的性质,学到了还原反应的概念,要在本节的教学中使学生能深入地理解氧化反应和还原反应的本质跟它们之间的相互关系;同时,为以后学习卤族元素的通性和碱金属的化学性质奠定了理论基础,并为第五章酸、碱、盐、化学肥料中划分化学
The content of the “oxidation-reduction reaction” in the fourth section of “Chemical” in the junior high school textbook is not only important but also difficult in the chemistry teaching in the third grade. At this time, the students have learned the properties of oxygen and chlorine, initially grasped the concept of oxidation reaction, learned the nature of hydrogen, learned the concept of reduction reaction, and in this section of the teaching students should be able to understand the oxidation reaction and The nature of the reduction reaction and the interrelationship between them; at the same time, it lays a theoretical foundation for studying the general properties of halogen elements and the chemical properties of alkali metals, and divides chemistry into five chapters: acids, alkalis, salts, and chemical fertilizers.