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初中化学全一册第74页,氢气还原氧化铜的实验,一些刊物上已介绍过不少改进做法,其目的都是提高演示实验的成功率和实验现象的明显程度。课本上对该实验所采用的试管型号没作具体要求,但从实验装置图的比例看,是采用的大号试管,口径在25mm 以上,需要较多量的气体才能充满试管,这是造成实验现象不佳的原因之一。再者,试管倾斜角度,也会影响实验的效果。因为在实验时,氢气流
The chemistry of junior high school on page 74, hydrogen copper oxide reduction experiments, a number of publications have introduced many improvements, the purpose is to improve the success rate of demonstration experiments and the apparent extent of experimental phenomena. Textbook on the experimental tube used in the model did not make any specific requirements, but the ratio of the experimental device diagram is the use of large test tube diameter of 25mm or more, requires a larger amount of gas to fill the test tube, which is caused by the experimental phenomenon One of the reasons for poor. In addition, the tube tilt angle, will also affect the experimental results. Because in the experiment, hydrogen flow