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在一次校内公开课上,我请学生参与发生装置气密性的检验操作,所使用的实验发生装置是锥形瓶、双孔橡皮塞、长颈漏斗、导气管。按照实验基本操作部分所学习的知识,学生先将实验装置连接好,接下来将导管的一端浸在水里,然后双手紧贴锥形瓶外壁,结果没有出现任何的实验现象。演示实验的学生产生了困惑,实验操作是正确的,但为什么导管口没有气泡冒出呢?坐在下面的学生多数也和他一样质疑着,但是很快有几名学生发现了问题所在,
In an open class on campus, I asked the students to take part in the airtightness test of the device. The experimental devices used were a conical flask, a double hole rubber stopper, a long neck funnel and a gas tube. According to the basic operation of the experimental part of the learning of knowledge, students first experimental device connected, then one end of the catheter immersed in water, and then hands close to the outer wall of the flask, the results did not appear any experimental phenomenon. The students who demoed the experiment were confused and the experimental operation was correct, but why did not the duct bubble up? The majority of the students sitting below questioned him as well, but soon a few students spotted the problem,