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现行高二课本测定乙醇分子结构实验,我们按照课本和教参的作法,反复进行过多次重复性的实验,发现产生氢气的体积都比理论量少。多次测定结果,彼此之间差别较大,很难说明乙醇分子只有一个氢原子比其他五个氢原子活泼。针对氢气体积比理论量少的问题,笔者在实验装置和操作上作了较大的改进。这样实验结果,测得的氢气体积经换算后很接近理论值,而且实验的时间短,更符合课堂演示的要求。现将实验的有关情况简介如下:
Current high school textbook determination of ethanol molecular structure experiments, we follow the textbook and teaching practice, repeatedly repeated many experiments and found that the volume of hydrogen generated less than the theoretical amount. Repeated determination of results, large differences between each other, it is difficult to explain that only one hydrogen atom of ethanol molecules than the other five hydrogen atoms lively. In view of the problem that the volume of hydrogen is less than the theoretical one, the author made great improvements in the experimental device and operation. The results of this experiment, the hydrogen volume measured by the very close to the theoretical value, and the experimental time is short, more in line with the requirements of the class presentation. The experiment is now briefed on the situation as follows: