论文部分内容阅读
在生石炭及二氧化碳的制取以及铁的冶炼中都要提到石灰石受高热所起的变化。因此,我经常在考虑:“如何以极短的时间,通过一简单的实验,来使学生亲眼看到石灰石受热的确是生在了CaO和CO_2”的问题。最近,我用图示的装置在课堂中进行了实验,实验一开始,学生们的眼光都注意着耀目的氢氧焰射到了小颗粒的石灰石上,即刻又被澄清石灰水的变混浊所吸引,并且都说:“CO_2来了!”在连续吹2—3分钟后就可得到2、3颗大豆那麽大的白色固
In the production of raw materials of carbon dioxide and carbon dioxide and iron smelting, the change of limestone subject to high heat should be mentioned. Therefore, I often consider: “In a very short period of time, through a simple experiment, to enable students to witness the limestone is indeed born in CaO and CO_2” problem. Recently, I used the illustrated device to conduct experiments in the classroom. From the very beginning of the experiment, the students’ eyes paid attention to the sparkling hydrogen and oxygen flame on the small particles of limestone, which was immediately attracted by the turbidity of the clarified lime water , And all said: “CO_2 is coming!” Two or three soybeans can be obtained after 2-3 minutes of continuous blowing