“用木炭还原氧化铜”和“用一氧化碳还原氧化铁”两个还原实验虽不太复杂,但却不容易得到理想的效果。笔者对这两个实验作了改进,使实验现象明显,并容易得到成功。一、“用木炭还原氧化铜”的实验这个实验用木炭还原氧化铜,要求看到反应生成的二氧化碳使澄清的石灰水变浑浊。把试管里的粉末倒在纸上,可以看到游离态的铜。但是按照课本上介绍的实验方法,混在炭粉里的铜不容易看清楚,可以用以下两个方法来解决这个问题。 1.取一干燥的试管,先在试管内加入一薄层碳粉,然后将氧化铜粉末用摺叠的小纸卷盛好,倾入试管内,抖动试管,使氧化铜粉末均匀地覆盖在木炭 Although the two reduction experiments of “reducing copper oxide with charcoal” and “reducing iron oxide with carbon monoxide” are not too complicated, it is not easy to obtain the desired effect. The author made improvements on these two experiments, making the experiment obvious and easy to be successful. First, the “reduction of copper oxide with charcoal,” the experiment This experiment with copper oxide reduction of copper oxide, asked to see the reaction of carbon dioxide to clarify the lime water turbidity. Pour the powder in the test tube onto the paper to see the free copper. However, according to the experimental methods introduced in the textbook, the copper mixed in the carbon powder is not easy to see clearly, and the following two methods can be used to solve this problem. 1. Take a dry test tube, first add a thin layer of carbon powder in the test tube, and then the cupric oxide powder filled with folded small paper roll, poured into the test tube, shaking the test tube so that uniform coverage of copper oxide powder charcoal