最近,我在讲压力对化学平衡的影响一课时,作了一些改进,效果较好,特写出来与同志们一起学习、研究。我设计了这样一个实验:首先准备好两个大小相同的广口瓶和两个大小相同的玻璃钟罩,钟罩底部涂上凡士林,放在玻璃板上。接着,利用铜与浓硝酸反应制出二氧化氮,充入广口瓶中,用涂凡士林的表玻璃盖好,设为甲瓶;立另一个广口瓶中滴入数滴溴,同样用涂过凡士林的表玻璃盖好,设为乙瓶;调整两瓶的颜色,使达一致。然后,分别将甲瓶、乙瓶倒转与两个钟罩口对齐,迅速抽出表玻璃。不久,即可看到两个钟罩中颜色显著不同。做完实验后,给学生讲清楚,二氧化氮和四氧化二氮之间有一个化学平衡的问题,其反应式两边的体积数与分子数为: Recently, when I talked about the effect of stress on the balance of chemistry, I made some improvements and got better results. I used close-ups to study and study together with comrades. I designed such an experiment: First, prepare two jars of the same size and two glass jars of the same size. The bell jar is painted with vaseline on the bottom and placed on the glass plate. Next, use nitrogen to react with concentrated nitric acid to produce nitrogen dioxide, fill it into a wide-mouth bottle, cover it with Vaseline glass, and set it as a bottle; add another drop of bromine to another wide-mouth bottle. Spread the Vaseline glass cover and set it as the B bottle; adjust the color of the two bottles to make it consistent. Then, the bottles A and B are inverted and aligned with the two bell mouths, and the watch glass is quickly drawn out. Soon, you can see the color of the two bell jars is significantly different. After completing the experiment, explain to the students that there is a chemical balance between nitrogen dioxide and dinitrogen tetroxide. The volume and number of molecules on both sides of the reaction equation are: