论文部分内容阅读
在初中化学第二章第八节“物质不灭定律”这个题目里,教本上用氯化铁和苛性钠为材料。但这实验只说明“两种溶液进行反应而生成沉淀,反应物的总重量等于生成物的总重量”。而教本上例举的硷式碳酸铜锻烧的实验是不适宜作演示材料的。而大纲(修订草案)里指出的:“硫或磷在密闭容器里燃烧,在燃烧以前和燃烧以后容器和容器里所含物质的总重量不变”。这一内容作为演示材料也不够好。为了比较好的证明物质不灭定律,我用稀盐酸和大理石作用,生成的二氧化碳气用苛性钠(或苛性钾)溶液吸收。装置如图。用时将分液漏斗的盖盖好,整套装置(包括仪器和
In junior high school chemistry chapter VIII, “the law of material immortality” in this subject, the textbook with ferric chloride and caustic soda as the material. However, this experiment only states that “the two solutions react to form a precipitate, and the total weight of the reactants is equal to the total weight of the product.” The textbook example of basic copper carbonate calcination experiment is not suitable for presentation materials. The outline (draft revision) states: “Sulfur or phosphorus in a closed container, before burning and after burning the total weight of the contents of the container and container unchanged.” This content is not good enough as a demonstration material. In order to better prove the law of immiscibility, I use diluted hydrochloric acid and marble, the resulting carbon dioxide gas with caustic soda (or caustic potash) solution absorption. Device as shown. When used will be separatory funnel cover, the entire device (including instruments and