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用信封折叠分子模型具有取材方便、工具简单,成本低廉、制作容易等特点。通过分子模型的制作,可增强学生对空间、对称性、平面与立体相互间的关系以及其他一些数学概念的理解和思考能力,为立体化学的学习打好基础。一、正四面体(CH_4、 CCl_4等)的制作1. 如图1,将信封直向平放,左右两边对折,折出中心线(也可利用圆规、刻度尺等作出)。2. 固定底边 A 端,将右下部分向上折,使 B 点落在中心线上,其在中心线上的对应点为 E(利
The folded molecular model with an envelope has the characteristics of convenient material acquisition, simple tools, low cost, and easy production. Through the production of molecular models, students can enhance their understanding of space, symmetry, the relationship between plane and three-dimensional, and other mathematical concepts, so as to lay a solid foundation for the study of stereochemistry. First, the production of regular tetrahedron (CH_4, CCl_4, etc.) 1. As shown in Figure 1, the envelope is laid flat straight, with the left and right sides folded in half and folded out of the centerline (which can also be made using compasses, scales, etc.). 2. Fix the bottom edge of the A-side and fold the lower right portion upward so that the B-point falls on the centerline. The corresponding point on the centerline is E (Lee