“如何鉴别氢气、一氧化碳、甲烷三瓶无色气体”?此题在中学教材及辅导书中经常出现。检验方法多采用点燃法,利用三种气体燃烧及燃烧产物不同加以鉴别。从反应原理看学生容易接受,但在回答具体操作即如何点燃气体,又如何检验燃烧产物时,学生感到茫然,教材及辅导书也没有讲清楚。 “How to identify the three colorless gases of hydrogen, carbon monoxide, and methane?” This question often appears in middle school textbooks and counseling books. The ignition method is often used in the inspection method and it is identified by using three kinds of gas combustion and combustion products. From the reaction principle, students are easy to accept, but when answering specific operations, that is, how to ignite the gas and how to examine the combustion products, the students feel guilty. The textbooks and counseling books are also not clear.