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化学中经常会遇到辨别物质成分的问题,而在解决这类问题时常常会用到对照法。所谓对照法,就是事先把各种物质的性质了解清楚,然后再通过实验对比的方法对未知物质进行鉴别。下面是王涛他们化学兴趣小组的同学运用对照法检验未知粉末成分的一个实例,让我们通过这个实例来了解这种方法的运用过程。
Chemistry often encounters the problem of distinguishing substance components, which are often used in the resolution of such problems. The so-called control method, that is, prior knowledge of the nature of various substances to understand clearly, and then through experimental methods to identify unknown substances. Here is Wang Tao students of their chemical interest group using the contrast method to test an example of unknown powder composition, let us use this example to understand the use of this method.