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1 问题的提出 在中学化学实验教学中,以二氧化氮转化为四氧化二氮的可逆反应为例,通过观察气体的颜色变比,得到温度对化学平衡的影响结论。出于二氧化氮为气体,它的制取、收集、存放,都有一定的困难;又由于二氧化氮为有毒气体,在实验过程中,因操作不当和装置密封不良,均会造成空气污染,进而危害师生的健康。所以,这个实验对实验室仪器设备的要求较高,不利于一些实验条件较差、经费紧张的学校开设这项实验。徐伶针对这个问题作了
1 The problem is raised. In the middle school chemistry experiment teaching, taking the reversible reaction of nitrogen dioxide into nitrogen tetraoxide as an example, the effect of temperature on the chemical equilibrium is obtained by observing the color transformation ratio of gas. For nitrogen dioxide as a gas, its preparation, collection, storage, have certain difficulties; because nitrogen dioxide is a toxic gas, in the experimental process, due to improper operation and device sealing is bad, will cause air pollution , and thus endanger the health of teachers and students. Therefore, this experiment has a high requirement for laboratory equipment and is not conducive to the opening of this experiment in some schools with poor experimental conditions and financial constraints. Xu Hao made a comment on this issue