“钠在氯气里燃烧”的实验。教师普遍反映实验效果不太理想。主要是实验稳定性差,重复性不太好,燃烧时现象不清晰,生成的白烟常常掩盖了燃烧现象,同时实验操作也不简便,还偶见有集气瓶破裂的情况。该实验如能作如下改进,以上缺点均可得到克服。 “Sodium burns in chlorine” experiments. Teachers generally reflect that the experiment results are not ideal. The main reason is that the experimental stability is poor, the repeatability is not very good, the phenomenon is not clear when burning, the white smoke generated often masks the combustion phenomenon, and the experimental operation is not simple at the same time, and occasionally there is a case where the gas cylinder is broken. If the experiment can be improved as follows, the above disadvantages can be overcome.