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学生在学习了氧化-还原反应以后,往往感到,对某些物质相遇能否反应,反应后生成什么物质,不易判断。我们认为,对高中学生可以向他们介绍,氧化-还原反应的方向是:强氧化型_1+强还原型_2→弱还原型_1+弱氧化型_2需指出:这里的“强”、“弱”是相对的。例如:Cu~(2+)+Zn→Cu+Zn~(2+)在反应中,对铜元素而言 Cu~(2+)为氧化型,其氧化能力比 Zn~(2+)强,因此 Cu~(2+)是强氧化型,对锌元素而言锌单质的还原能力比铜单质强,因此
After learning the oxidation-reduction reaction, students often feel that it is not easy to judge whether or not certain substances can react and react. We believe that high school students can introduce to them that the direction of oxidation-reduction reaction is: strong oxidation type 1+strong reduction type 2→weak reduction type 1+weak oxidation type 2 It is necessary to point out that “strong” here. “Weak” is relative. For example: Cu 2+ Zn 2+ Cu Zn 2+ In the reaction, Cu 2+ is an oxidized type for copper, and its oxidizing ability is stronger than that of Zn 2+ . Therefore, Cu~(2+) is a strong oxidized type, and the ability to reduce elemental zinc is stronger than that of copper alone for zinc.