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为了解决不使用石棉,既能使实验易做,而现象又明显的问题,我们采用用粉笔未取代石棉来进行钻在氯气中燃烧的实验。〔实验步骤〕:在燃烧匙里铺上一层粉笔末,放入已擦尽表面煤油的一小块金属钠,加热,等钠刚开始燃烧,就立刻连匙带钠伸进盛氯气的集气瓶里。此时,很明显地观察到黄色火焰、白色浓烟。实验结束,还可看到,烧烧匙内粉笔末上留有氯化钠晶体。
In order to solve the problem of not using asbestos, which can make the experiment easy to do and the phenomenon is obvious, we used an experiment in which chalk was not used to replace asbestos for combustion in chlorine gas. (Experimental step): Spread a chalk powder in the burning spoon, place a small piece of metal sodium that has been wiped off the surface of kerosene, and heat it. When the sodium just starts to burn, immediately put the spoon with sodium into the set of chlorine. In the cylinder. At this time, yellow flames and white smoke were clearly observed. At the end of the experiment, it can also be seen that sodium chloride crystals remain on the end of chalk in the burning spoon.