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为了帮助学生理解同素异形体概念,我先打了一个比方,我讲:“有一批质量、大小、颜色完全相同的砖头,一部分砌成空心花墙,另一部分砌成实心厚墙,这两种墙的原料、结构和牢固程度有什么异同?”学生对这个问题很容易理解。然后,我再把“一块块相同的砖”与“一个个相同元素的原子”对比,说明金刚石和石墨是由同种元素组成的,其性质不同,是由于碳原子排列方式不同,即结构不同的缘故。这样学生很快便理解了同素异形
To help students understand the concept of allotrope, let me start with an example. I said: “There are a number of bricks of the same quality, size, and color. Some are made of hollow flower walls, and the other part is made of solid thick walls. What are the similarities and differences in the raw materials, structure and firmness of the wall? ”Students are easy to understand on this issue. Then I compared the “same block of bricks” with “one atom of the same element”, which shows that diamond and graphite are made of the same kind of elements, and their properties are different because of the different arrangements of carbon atoms, namely different structures The reason. So students will quickly understand the same type of shape