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高中《化学》第三册卤代烃一节,卤代烃的消去反应没有安排演示实验,学生对“生成不饱和化合物”这句话缺乏感性认识,不易理解和掌握,为此,我设计了如下实验: 在烧瓶中加入10ml 1—溴丁烷,加2克粒状NaOH,再加入10ml无水乙醇。然后将烧瓶与回流冷凝器相连结,用导管将反应生成的气体导入盛有溴水或KMnO_4(酸性)溶液的试管中(如图一)加热。四、五分钟后即可看到溴水或KMnO_4(酸性)溶液褪
There was no demonstration experiment on the elimination reaction of halogenated hydrocarbons in Chemistry Section III of the High School Halogenated Hydrocarbons. Students lacked sentimental knowledge about the phrase “unsaturated compounds” and were not easy to understand and master. For this reason, I designed The following experiment was performed: Into a flask was added 10 ml of 1-bromobutane, 2 g of granular NaOH was added, and 10 ml of anhydrous ethanol was further added. The flask was then connected to a reflux condenser, and the reaction generated gas was introduced into a test tube containing bromine water or KMnO 4 (acidic) solution (see Fig. 1) and heated with a pipe. After four or five minutes, you can see the bromine water or KMnO_4 (acid) solution faded