What is the shape around each carbon in ethane?

Each carbon in ethane is bonded to one carbon and three hydrogens and has a tetrahedral shape with bond angles close to one hundred eight degrees.

Think of each carbon like the center of a small pyramid with four sticks reaching out to the corners, one stick to the other carbon and three sticks to hydrogen atoms, so the atoms spread out evenly to stay as far apart as possible. The shape is called tetrahedral, which means four faces like a triangular pyramid, and the bond angles are about one hundred eight degrees rather than ninety because the bonds push each other into that arrangement. Each carbon uses four single bonds made from hybrid orbitals that point toward the corners of the tetrahedron, and the hydrogens sit at those corners. Because both carbons have the same arrangement, the whole molecule looks like two tetrahedra sharing a corner where the carbons connect.

Students often think the molecule is flat because two carbons are next to each other, but ethane is three dimensional so the hydrogens are not in the same plane as the carbon bond; remember the tetrahedral shape around each carbon. Another common mistake is picturing right angles like in a cube; the correct angle is about one hundred eight degrees, so do not draw ninety degree corners. Some learners confuse the shared carbon-carbon bond with changing the geometry at each carbon, but the bond only connects the tetrahedra and does not change the local tetrahedral shape around each carbon.

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Tetrahedral Geometry Around Each Carbon

1. Carbon is center of tetrahedron
2. Bonds spread out evenly
3. Shape is tetrahedral
4. Bond angles ≈ 108 degrees
5. Carbon uses four hybrid orbitals
6. Hydrogens occupy tetrahedron corners
7. Two tetrahedra share a carbon

Common Mistakes About Carbon Geometry

1. Assuming the molecule is flat
2. Drawing 90 degree bond angles
3. Thinking the C–C bond changes geometry

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