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在近些年的高考理综试卷中,有不少学生选择化学选修三《物质结构与性质》,然而学生在复习备考中,感觉到第三章考查的知识点相对较难,要求学生有较强的空间想象能力,主要考点有各种晶体类型的判断、熔沸点高低的比较以及晶胞体积和密度的相关计算。在这些常见的考点中,学生做的较差的往往是最后一个空,即关于晶胞体积、边长、密度等的相关计算,为了使学生这道题答得更好,下面以一道题进行简单的剖析和归纳。例如:在AlN的晶胞中,如已知晶胞的密度为ρg/cm3,求晶胞
In recent years, college entrance examination science comprehensive examination papers, many students choose to choose three “material structure and nature of chemistry,” However, students in the review preparation, I feel the knowledge of the third chapter is relatively difficult to test, require students to have more Strong spatial imagination, the main test sites have various types of crystal judgments, the level of melting point comparison as well as the unit cell volume and density of the relevant calculations. In these common test centers, the students often do is the last one empty, that is, on the unit cell size, side length, density and other related calculations, in order to make students answer this question better, the following one question Simple analysis and induction. For example: In the unit cell of AlN, if the density of unit cell is known as ρg / cm3,