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利用铁丝能被磁铁吸引的原理,将长约25 mm、直径约3 mm的一截铁丝密封在小玻璃管内,再将铜丝缠绕在小玻璃管上并置于J形玻璃管内。在J形玻璃管外壁用小磁铁吸引J形玻璃管内的铁丝带动铜丝沿着J形管内壁上下移动,可以实现铜和浓硝酸或稀硝酸的接触或分离,从而控制化学反应的发生或停止。实践证明,该方法使用了磁铁吸引铁丝,能够激发学生的学习兴趣;原理简单易懂,学生容易接受;易于操作,方便处理装置中氮的氧化物,防止污染空气,更加环保。
Using a principle that the wire can be attracted by a magnet, a length of wire about 25 mm in diameter and about 3 mm in diameter is sealed in a small glass tube, and the copper wire is wound around the small glass tube and placed in a J-shaped glass tube. In the J-shaped glass tube with a small magnet on the outer wall to attract the J-shaped glass tube driven by copper wire along the J-tube wall up and down movement, copper and concentrated nitric acid or dilute nitric acid to achieve contact or separation, and thus control the occurrence of chemical reactions or stop . Practice has proved that this method uses a magnet to attract the wire, which can stimulate students’ interest in learning. The principle is easy to understand and easy for students to accept. It is easy to operate and convenient to handle nitrogen oxides in the device to prevent air pollution and make the environment more environmentally friendly.