(Polar molecules, Non-polar molecules, etc.)
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For the CH2F2 structure, the answer in the book shows more of a 3D model indicated by the filled in wedge and striped line wedge for the bonds between the carbon and hydrogens. Do we need to draw the lewis structure like that or can we draw it how we have been doing, in the 2D model?
I would recommend drawing the structure with the implied "3Dness" (the dashes and the solid black triangles) since that is the only way you can correctly label it a tetrahedral. If you draw it in the 2D version, the bond angles won't be displayed properly because that would imply that the molecule is flat with both 90 degree and 180 degree bond angles which wouldn't make sense. Hope that helped!