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甲烷,CH_4,是一个最简单的有机化合物。讲有机化学的时候,最先遇着它。它的制备方法很多,在教科书上举的例子,主要是(1)由醋酸钠或醋酸钾和碱石灰混合加热;(2)收集植物腐烂而发生的气体,或用沔泥与草作用而收集其气体。实验室里或教员演示多用第一法。这个方法的好处,在於装置简单,用的药品易於购买,出气迅速。但亦有些缺点,如能制出的气太少,而且开始发生的气体总是与试管中的空气相混合,不适於作实验,待空气排出后,已经收集不到多少了。虽然有这些缺点,但教师们仍然很少
Methane, CH 4, is one of the simplest organic compounds. Speaking of organic chemistry, the first encounter with it. It is prepared in many ways. Examples of textbooks include: (1) mixing with sodium acetate or potassium acetate and soda lime; (2) collecting gases produced by decay of plants or collecting them with mud and grass Its gas. Laboratory or instructor to demonstrate multipurpose first method. The advantage of this method is that the device is simple, the medicines used are easy to buy, and the gas is discharged quickly. However, there are also some drawbacks. For example, if too little gas can be produced, the starting gas always mixes with the air in the test tube and is not suitable for experiments. After the air has been discharged, it has not been collected yet. Despite these shortcomings, teachers are still few