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一、穿插有关氧化还原反应的知识教学化学反应可分为四种基本反应类型:化合反应、分解反应、置换反应、复分解反应.氧化反应与还原反应.氧化反应:物质与氧的反应;还原反应:物质中的氧被夺去的反应.此处的氧既可以指单质形态的氧(游离态),又可以指化合物中的氧(化合态).对于氧化还原反应的判断,初中教学仅从得氧、失氧的角度进行区分.如果给定下列信息让学生做题也未必不可.例如,在化学反应中,物质所含元素的化合价发生了变化的反应就是氧化还原反应.示例,2Na+Cl2=点燃2NaCl,反应前后Na、Cl的化合价发生了变化,该反应是氧化还原反应.
First, interspersed with knowledge about the redox reaction Teaching Chemical reactions can be divided into four basic types of reactions: chemical reaction, decomposition reaction, displacement reaction, metathesis reaction. Oxidation reaction and reduction reaction Oxidation reaction: substance and oxygen reaction; reduction reaction : Substance oxygen is taken away reaction .Oxygen here can be both simple form of oxygen (free state), but also refers to the compound of oxygen (compound state) .For the redox reaction to judge, junior high school teaching only from Oxygen, oxygen loss perspective.If given the following information to allow students to do the question may not necessarily.For example, in the chemical reaction, the valence of the elements contained in the material reaction is the redox reaction.For example, 2Na + Cl2 = 2NaCl is ignited, before and after the reaction Na, Cl valence has changed, the reaction is a redox reaction.