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九七年化学考纲明确要求学生:对原子、分子、化学键等微观结构有一定的三维的想象能力。这就要充分调动空间想象能力,将二维图形转换成三维实物。一、对称迁移、巧妙插入:例1.将甲烷分子的4个氢原子互相连接可以构成一个正四面体,下图是一个正立方体,设想将一个甲烷分子放入,碳原子将居于该正立方体的中心,黑球表示已有1个氢原子居于该立方体的一角。请在图上另画三个黑球标示其它3个氢原子的位置。
The 1997 chemistry survey clearly requires students to have a certain three-dimensional imagination ability for microscopic structures such as atoms, molecules, and chemical bonds. This must fully mobilize the imagination ability of the space and transform the two-dimensional graphics into three-dimensional objects. First, the symmetrical migration, ingenious insertion: Example 1. The four hydrogen atoms of the methane molecule can be connected to each other to form a regular tetrahedron, the following figure is a positive cube, it is envisaged that a methane molecule will be placed, the carbon atom will be in the positive cube At the center, the black ball indicates that there is already a hydrogen atom in one corner of the cube. Please draw three other black balls on the map to indicate the location of the other three hydrogen atoms.