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1.仪器和药品 20×200mm具支试管、15×150mm试管、烧杯、橡皮塞、铁架台、塑科片、药棉、固体高锰酸钾、浓盐酸、稀盐酸、锌粒、镁带、氢氧化钠溶液等。 实验装置如图所示。 1.塑料片 2.稀盐酸微粒 3.浓盐酸、KMnO_4 4.NaOH溶液 2.实验操作步骤 横孔试管的制作:取15×150mm试管,用酒精喷灯在离试管底部约3cm处灼烧至
1. Instruments and medicines 20 x 200mm with test tubes, 15 x 150mm test tubes, beakers, rubber stoppers, iron racks, plastics, cotton wool, solid potassium permanganate, concentrated hydrochloric acid, dilute hydrochloric acid, zinc particles, magnesium tape, hydrogen Sodium oxide solution and so on. The experimental device is shown in the figure. 1. Plastic sheet 2. Dilute hydrochloric acid microparticles 3. Concentrated hydrochloric acid, KMnO 4 4. NaOH solution 2. Experimental procedures Horizontal hole test tube preparation: Take a 15×150mm test tube and incinerate it with alcohol torch about 3cm from the bottom of the test tube.