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高中课本第二册乙烯、乙炔点燃实验,在实验过程中产生大量黑烟,烟尘四处飞散,造成环境污染,同时也影响学生对实验现象的观察。在此实验中,要求学生观察两个现象,一个是明亮的火焰,一个是黑烟。在这种情况下大多数同学把注意力都集中到了四处飞散的黑烟上而忽略了前者。针对以上缺点,我对该实验做了改进。 装置如附图。将一个100 mL的小烧杯固定在铁架台上端,使烧杯口朝下。再将一只90mm的漏斗套在玻璃尖嘴导管上(导管用较漏
High school textbooks Vol.2 Ethylene and acetylene ignited the experiment. During the experiment, a large amount of black smoke was produced. The smoke and dust scattered around and caused environmental pollution. At the same time, it also affected students’ observation of experimental phenomena. In this experiment, students are required to observe two phenomena, one is a bright flame and the other is black smoke. In this case, most students concentrated their attention on the scattered black smoke and ignored the former. For the above shortcomings, I improved the experiment. The device is like a picture. A 100 mL small beaker is fixed on the upper end of the iron frame with the beaker mouth facing down. Then put a 90mm funnel on the glass tip pipe (catheter with more leakage