1.氢气燃烧的产物这样看得更清楚氢气在空气里燃烧的实验,照课本第70页图2—8去做,坐在离讲台稍远的学生很难看清燃烧生成的水珠。我对此实验做了如下改进:在干燥的烧杯里,先均匀撒上一层研细的高锰酸钾粉末,然后点燃氢气。这样,烧杯壁就会出现红色的水珠。燃烧时间稍长,还可以观察到杯壁上出现红色液流。 1. Hydrogen Combustion Products The experiment of seeing hydrogen burning in the air is more obvious. As shown in Figure 2-8 on page 70 of the textbook, it is difficult for students sitting a little bit far from the podium to see the water droplets generated by combustion. I made the following improvements to this experiment: In a dry beaker, first spread a layer of fine powder of potassium permanganate and then ignite hydrogen gas. In this way, red beads appear on the beaker wall. The burning time is slightly longer, and red liquid flow can also be observed on the cup wall.