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初三课本上“CO 还原 CuO 实验”的装置,若改按下图装置操作,可得到更理想的实验效果。按改进装置操作的好处是,不用增加实验时间.学生可以同时看到一氧化碳还原氧化铜和一氧化碳还原氧化铁两个实验;原为红色的氧化铁粉被还原成黑色的铁粉,而原为黑色的氧化铜则被还原为红色的铜,明显的颜色变化和强烈的颜色对比,使学生记住了因容易混淆而难以记住的四种物质的颜色;当学生看到生成的铁粉能随磁铁移动,而铜不能随磁铁移动耐,对铁具有铁磁性,铜没有铁磁性又有了感性认识。实践证明,采用组合实验,常能收到单个实验达不到的教学效果。
The textbook on the first three days “CO reduction CuO experiment” device, if you press the device below the operation, you can get a better experimental results. The benefits of improved device operation are that there is no need to increase the duration of the experiment. Students can see both the experiments of carbon monoxide reduction of copper oxide and carbon monoxide reduction of iron oxide; the original red iron oxide powder is reduced to black iron powder while the former is black Of the copper oxide is reduced to red copper, the obvious color change and strong color contrast, so that students remember the color of the four substances because it is easy to confuse and hard to remember; when students see the generated iron powder with Magnet movement, and copper can not move with the magnet resistance, iron has a ferromagnetic, ferromagnetic copper has a perceptual knowledge. Practice has proved that the combination of experiments, often can not receive a single experiment teaching results.