现行化学 (选修 )第三册第一章第二节中关于温度对化学平衡的影响演示及学生分组实验 ,均选用二氯化氮和四氧化二氮已达到平衡的混合气体来做。从我多年的实践中 ,深深体会到该实验的准备难点是 :①在制备混合气体时 ,容器内很难达到理想的混合气体浓度 ,不是过浓便是过稀 ;② The demonstration of the influence of temperature on chemical equilibrium and the grouping of students in the second chapter of the first chapter of the current chemistry (optional) in Book 3 are all made of a mixture of nitrogen dichloride and dinitrogen tetroxide that has reached equilibrium. From my many years of practice, I have learned deeply that the difficulties in preparing this experiment are: 1 When preparing the mixed gas, it is difficult to achieve the ideal mixed gas concentration in the vessel, and if it is too rich, it is too lean;