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给学生做演示实验,要在尽可能短的时间内达到最佳实验效果(实验现象明显)。我们在教学法实验中,对这一实验的投料进行了探讨,以便达到上述实验要求。用炭粉还原氧化铜实验,尽管有人做过改进(将木炭粉与氧化铜粉末混和加水调成糊状,涂抹在试管壁上,加强热)。但效果不是十分显著的,因为炭粉和氧化铜都为黑色扮末,如有一种物质过量,它就会遮盖了
For students to do demonstration experiments, the best experimental results should be achieved in the shortest time possible (experimental phenomena are obvious). In the pedagogical experiment, we have discussed the input of this experiment in order to achieve the above experimental requirements. The experiment of reducing copper oxide with carbon powder, although some people have made improvements (mixing charcoal powder with copper oxide powder and adding water into a paste, smear on the wall of the test tube to enhance heat). However, the effect is not very significant, because carbon powder and copper oxide are black, and if there is an excess of substance, it will cover up.