关于氯化铵的热分解实验，有一部分学生联想到升华现象，对氯化铵的热分解产生怀疑，错误地认为氯化铵也发生了升华现象。那么怎样才能排除异议，证明氯化铵确实发生了分解反应呢？这个问题可通过如下实验来说明：取一长25cm，直径2cm左右的玻璃管，于其中加入长4cm左右的一段 Regarding the thermal decomposition test of ammonium chloride, some students think of sublimation and have doubts about the thermal decomposition of ammonium chloride, and mistakenly believe that ammonium chloride also undergoes sublimation. So how can we rule out objections and prove that ammonium chloride does undergo a decomposition reaction? This problem can be explained by the following experiment: Take a glass tube with a length of 25cm and a diameter of about 2cm, and add a length of about 4cm to it.