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人教版九年义务教育三年制初级中学《物理》第一册第四章“热现象”中碘的“升华”实验,是一个必做的演示实验,教师按课本中的方法进行演示实验时,加热的程度掌握不好,很难控制瓶壁和瓶内碘块的温度,往往造成碘在升华的同时,与烧瓶内壁接触的小颗粒碘很快熔化了。学生往往认为;碘是先熔化,再汽化形成紫红色的碘蒸气。不仅演示实验的目的没有达到,反而使学生造成错误的认识。
The “Sublimation” experiment on iodine in the “Thermal Phenomenon” in Chapter 4 “Physics” of the nine-year compulsory education for junior high school of the People’s Education Press is a must-do demonstration experiment. The teacher conducts the demonstration experiment according to the method in the textbook. When the degree of heating is not well controlled, it is difficult to control the temperature of the bottle wall and the iodine block in the bottle, often causing iodine to sublime, while the small particle iodine in contact with the inner wall of the flask quickly melts. Students often think that iodine is first melted and vaporized to form a purple-red iodine vapor. Not only did the purpose of the demonstration experiment not be achieved, but it also caused students to misunderstand.