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[讨论] 举出五种硫酸锌的制备方法。 笔者认为设计得不够合理,应将硫酸锌改成硫酸镁。 初中阶段,主要是掌握酸性氧化物和碱性氧化物,而对两性氧化物只需初步了解就可以了。因此,教材第211页的各类物质关系图中,只列出了酸性氧化物和碱性氧化物,而没有涉及两性氧化物。为了使学生灵活地运用这个关系图,这节最后安排了课堂讨论——举出五种硫酸锌的制备方法。硫酸锌属盐类,在图中有十个箭头指向生成盐,也就是说,有十种可能的方法制取盐。事实上,学生们根据这个图只能得出四种制备硫酸锌的可能途径:
[Discussion] Five zinc sulfate preparation methods are listed. The author believes that the design is not reasonable enough, zinc sulfate should be changed to magnesium sulfate. In junior high school, it is mainly to grasp acidic oxides and basic oxides, but only need to understand the nature of the amphoteric oxides. Therefore, in the material maps on page 211 of the textbook, only acidic oxides and alkaline oxides are listed, but no amphoteric oxides are involved. In order to enable students to use this diagram flexibly, this section concludes with a discussion of the class – giving five ways to prepare zinc sulphate. Zinc sulphate salts, with ten arrows in the figure pointing to salt formation, that is, ten possible ways to make salt. In fact, students can only draw four possible ways to prepare zinc sulphate from this map: