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我不知道化学教学同仁是否愿意讨论这个问题。就笔者的经历,我知道这是大家很难回避而又颇感棘手的问题。中学化学教材上不涉及这个问题,课堂上教师有理由可以绕过它,可是它早已铺天盖地遍及多种教参、教辅以及多种应试练习题,作为任课教师你还能在课外回避得了吗?一、双氧水跟碘化钾人们根据在KI溶液中滴入双氧水,溶液显橙黄色表示有I_2(实为KI_3),提出了如下的答案:2KI+H_2O_2=2KOH+I_2,这种表达式似乎顺利地解释了反应是生成I_2,
I do not know whether chemistry teaching colleagues are willing to discuss this issue. As far as my experience is concerned, I know this is a difficult issue that we can hardly avoid but rather troublesome. High school chemistry textbooks do not cover this issue, teachers have reason to be able to bypass it in the classroom, but it has been overwhelming variety of teaching reference, teaching aids and a variety of test exercises, as a classroom teacher you can get away from it? First, hydrogen peroxide and potassium iodide According to the KI solution in drops of hydrogen peroxide, the solution was orange yellow said I_2 (actually KI_3), the following answer: 2KI + H_2O_2 = 2KOH + I_2, this expression seems to be successfully explained The reaction is to generate I_2,