我的一点建议

• 作 者: 王泓
• 机 构: 四川阆中县保宁中学,
• 出 处: 江苏教育
• 发表日期: 1990年12期
• 关键词: 集气瓶 初中化学 盖玻片 氯化氢 氢气 氯气 酸雾 刺激性气味 盐酸 前几

下面两幅图,分别是初中化学 P74及 P115页上的“图2-10”和“图3-6”。图1的集气瓶口未盖玻片,图2的集气瓶口却盖上了硬纸片。我建议在图1的集气瓶上要盖上玻片,而在图2的集气瓶上可不盖硬纸片,若要盖硬纸片,则要留有相当宽的缝隙,理由如下。图1所示的是“氢气在氯气里燃烧”的实验,由于产物氯化氢有强烈的刺激性气味,它逸出瓶口所形成的盐酸酸雾仍具有强烈的刺激性,若敞着瓶口,逸出的酸雾会使教师和前几排的学生感到难受;若

The following two figures, “Figure 2-10” and “Figure 3-6” on pages P74 and P115 of the Junior High School Chemistry respectively. The gas cap of FIG. 1 is not covered with glass, and the gas cap of FIG. 2 is covered with hard paper. I suggest to attach a glass slide to the gas-collecting bottle of FIG. 1, but not to a piece of cardboard in the gas-collecting bottle of FIG. 2. To cover the cardboard, a rather wide gap is left for the following reasons. Figure 1 shows the “hydrogen in the combustion of chlorine,” the experiment, as the product of hydrogen chloride has a strong irritating odor, it escapes the bottle mouth formed acid mist still has a strong irritant, if the open bottle, The acid fog that escaped can make teachers and students in the first few rows uncomfortable;