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初中化学课本第25面至26面安排了[实验1—6]、[实验1—7]、[实验1—8]来介绍二氧化锰能加快氯酸钾制氧气的化学反应速度。在实际教学中,我觉得这三个演示实验单独做耗时较长,且对比性不强。所以在教学中,我将以上三个实验合并在一起做,效果比较理想,现介绍如下。 一、实验装置(如右图) 二、实验操作 分别装好药品(A——KClO_3;B——MnO_2;C——KClO_3和MnO_2)。将三支试管固定在同一个铁架台上,同时加热后,将三根卫生香点燃,分别吊入三支试管内。
On the 25th to 26th sides of junior high school chemistry textbooks, [experiments 1–6], [experiments 1–7], and [experiments 1–8] were introduced to introduce that manganese dioxide can accelerate the chemical reaction rate of potassium chlorate to oxygen. In practical teaching, I feel that the three demonstration experiments alone take a long time and are not comparatively strong. Therefore, in teaching, I will combine the above three experiments together, the effect is more ideal, is introduced as follows. First, the experimental device (such as the right picture) Second, the experimental operation were packed with drugs (A - KClO_3; B - MnO_2; C - KClO_3 and MnO_2). The three test tubes were fixed on the same iron stand and, at the same time, the three hygienic incense were ignited and were respectively suspended into three test tubes.