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中师化学课本第一册的演示实验2-1,是通过点燃按比例混和的氢气和氧气来测定两者化合时的体积比。这个实验在实际操作中会遇到下述困难:1,当点混和气体的配比在爆炸极限以内时,该反应非常剧烈,爆炸时,高压气体会从玻璃管底部喷出。2. 当点混和气体的配比爆炸极限以外时,该反应过程就比较缓和,
The demonstration experiment 2-1 in the first volume of the textbook for the middle school chemistry textbook is to determine the volume ratio when the two are combined by igniting a mixture of hydrogen and oxygen in proportion. This experiment will encounter the following difficulties in actual operation: 1. When the mixing ratio of point mixing gas is within the explosion limit, the reaction is very violent. During the explosion, high-pressure gas will be ejected from the bottom of the glass tube. 2. When the mixing point of the mixed gas exceeds the explosion limit, the reaction process is more moderate.