Understanding valence-shell electron-pair repulsion (VSEPR) theory using origami molecular models

International Conference on Science and Applied Science (Engineering and Educational Science) 2016

物理学;工业技术;教育

Saraswati, Teguh Endah^1,2 ; Saputro, Sulistyo^2 ; Ramli, Murni^2 ; Praseptiangga, Danar^2 ; Khasanah, Nurul^3 ; Marwati, Sri^4

Department of Chemistry, Mathematic and Natural Science Faculty, Sebelas Maret University, Jl. Ir. Sutami 36A, Surakarta

57126, Indonesia^1

Center for Japanese Studies, Sebelas Maret University, Jl Ir. Sutarmi 36 A, Surakarta

57126, Indonesia^2

Madrasah Aliyah Negeri 1 Surakarta, Jl. Sumpah Pemuda No.25, Banjarsari Surakarta

57136, Indonesia^3

Madrasah Aliyah Negeri 2 Surakarta, Jl. Brigjen Slamet Riyadi No.308, Laweyan Surakarta

57141, Indonesia^4

关键词: Chemistry education;    Molecular geometries;    Molecular shapes;    Structure prediction;    Three dimensional modelling;    University levels;    Valence shell electron pair repulsion;    VSEPR theory;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/795/1/012066/pdf
DOI  :  10.1088/1742-6596/795/1/012066

来源: IOP

【 摘 要 】

Valence-shell electron-pair repulsion (VSEPR) theory is conventionally used to predict molecular geometry. However, it is difficult to explore the full implications of this theory by simply drawing chemical structures. Here, we introduce origami modelling as a more accessible approach for exploration of the VSEPR theory. Our technique is simple, readily accessible and inexpensive compared with other sophisticated methods such as computer simulation or commercial three-dimensional modelling kits. This method can be implemented in chemistry education at both the high school and university levels. We discuss the example of a simple molecular structure prediction for ammonia (NH3). Using the origami model, both molecular shape and the scientific justification can be visualized easily. This 'hands-on' approach to building molecules will help promote understanding of VSEPR theory.