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Ⅳ关于插图和实验方面的问题第一章1.插图1的液体比重计问题图1所示的比重计是轻表和重表合为一支。就我们所知,一般学校中并没有这种比重计,市上也没有这种比重计供应。因此,这个插图给教学上带来了某些困难。建议改用轻重表分开的图比较恰当。(福建教师进修学院郭卓羣等)2.关于溴蒸气的扩散实验图3中扩散到大瓶中的溴如何处理,这样操作不仅是浪费,同时亦甚危险。实际的实验操作是在玻璃水槽中放一坩埚或蒸发皿,再滴几滴溴,然后再用玻璃钟罩罩上,观察溴的扩散现象。实验完毕在水槽中加水,使钟罩内的溴溶于
IV INSPECTIONS AND EXPERIMENTAL ISSUES CHAPTER 1 1. The hydrometer of Figure 1 The hydrometer shown in Figure 1 is a combination of a light gauge and a heavy gauge. To the best of our knowledge, there is no such scale in schools and no such scale is available in the market. Therefore, this illustration poses some teaching difficulties. Proposed to use separate tables lighter weight more appropriate. (Fujian Teachers Training College Guo Zhuoqun, etc.) 2. About the Diffusion Experiment of Bromine Vapor Bromine diffused into the big bottle in Figure 3 is not only wasted, but also dangerous. The actual experimental operation is to place a crucible or pan in a glass sink, then drop a few drops of bromine, and then covered with a glass bell jar to observe the phenomenon of bromine diffusion. The experiment is completed in the water tank, the bell dissolved in bromine