讲到初中化学新课本(许国培、王世显、周芬编)第一章第五节中,糖在加热时变成了炭和可燃性气体的演示实验时,我感到在实验仪器上需要改进一下。这个实验主要是说明糖经加热后,变成了炭和可燃性气体,当用火点燃来证明有可燃性气体放出时,因为试管口太粗,气体跑得太快,使火焰很难站住,这样所得到的现象就不够明显,最好用一个带有导管(不很长的玻璃管) Speaking of the new textbook for junior high school chemistry (Xu Guopei, Wang Shixian, Zhou Fenbian) Chapter I, Section 5, when sugar turns into a demonstration experiment of charcoal and combustible gas on heating, I feel that there is a need to improve on the experimental apparatus . This experiment is mainly to explain the sugar after heating, into a carbon and flammable gas, when ignited with a fire to prove flammable gas release, because the test tube mouth is too thick, the gas ran too fast, so that the flame is difficult to stop, This phenomenon is not obvious enough, it is best to use a catheter (not very long glass tube)