VSEPR tetrahedron educational model
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A model for an illustrative demonstration of the calculation of angles in a tetrahedral molecule
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Model information
- Source
- Printables
- Category
- Chemistry & Biology
- License
- Creative Commons — Attribution — Noncommercial
Whenever we learn the shapes of molecules using the VSEPR method, the angles between the bonds in a tetrahedral molecule (e.g. methane, silane, sulfate anion, etc.) cannot be reliably estimated at first glance (for a triangle it can be seen that it is 360/3=120°, for a trigonal bipyramids 90° and 120° respectively). Moreover, the value 109° 28' is not a pretty number.
The calculation is not complicated and there are many paths to it; one of them is over volume. The model tries to show that the volume of a tetrahedron is the sum of the volume of 4 trigonal pyramids.
The model can be printed as 4 trigonal pyramids, or as one + tetrahedron without one of them.