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在盛有氧气的集气瓶中进行物质燃烧实验,因集气瓶里氧气量有限,燃烧时间短,现象消失快,难于满足学生的观察需要。人教版九年级化学教材中的实验是将氧气收集与物质燃烧两个过程分开的,若把此两个过程重叠,如家用液化气灶,氧气从集气瓶底部进入,物质从集气瓶口伸入,两个过程同时进行。这样就能既连续供氧,又持续燃烧,使学生能清楚地观察到实验现象。针对有些物质燃烧会产生有害气体的现象,可采用及时有效的设计处理方式,让学生真正体会到实验绿色化的理念。
The material burning experiment was carried out in a collection cylinder containing oxygen. Due to the limited amount of oxygen in the collection cylinder, the burning time was short and the phenomenon disappeared quickly. It was difficult to meet the observation needs of students. The experiment in the 9th grade chemistry textbook of the People’s Education Press separates the two processes of oxygen collection and material combustion. If the two processes overlap, such as a household liquefied gas stove, oxygen enters from the bottom of the gas cylinder and the material from the gas cylinder. The mouth is extended and both processes are performed at the same time. In this way, both continuous oxygen supply and continuous combustion can be achieved so that students can clearly observe experimental phenomena. For the phenomenon that some substances will produce harmful gases, timely and effective design and processing methods can be adopted, so that students can really understand the concept of experiment green.