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在按正确步骤做碳酸氢铵分解的实验中,发现试管总是容易破裂,通过多次的对比实验,发现同一批试管破裂的原因原来与晶体的熔点有关,对于在加热过程中会熔化且熔点远低于酒精灯焰温度的晶体,试管一般较易因内外壁温差大而破裂,但我们可以通过不时地移动酒精灯来克服;对于加热过程中会熔化,但熔点接近酒精灯焰温度的晶体,试管一般完好无损;对于加热过程中无熔化现象的晶体,试管很难破裂。
In the correct steps to do ammonium bicarbonate decomposition experiments, the test tube is always easy to rupture, through a number of comparative experiments found that the same batch of test tube rupture reason originally with the melting point of the crystal, for the melting process will be melting and the melting point Crystals that are well below the temperature of the alcohol lamp flame are generally more susceptible to rupture due to large differences in temperature between the inner and outer walls, but we can overcome this by moving the alcohol lamp from time to time; for crystals that melt during heating but have a melting point close to the temperature of the alcohol lamp flame , The test tube is generally intact; it is hard to rupture the test tube for crystals that do not melt during the heating process.