Question
H2 and N2 are the only homonuclear diatomic gases whose highest-occupied MO is this kind of orbital. For 10 points each:
[10m] Name these low-energy molecular orbitals that form when atomic orbitals overlap constructively. They are not represented by an asterisk.
ANSWER: bonding molecular orbitals [or bonding MOs; prompt on chemical bonds or covalent bonds; reject “antibonding” or “nonbonding” orbitals]
[10e] The six bonding electrons in nitrogen gas form one of these very strong covalent bonds made up of a sigma bond and two pi bonds.
ANSWER: triple bonds
[10h] In organic molecules with this property, the bonding pi orbitals are completely filled and the antibonding pi orbitals are completely empty. The pi orbital energies coincide with the vertices when molecules with this property are inscribed in a circle.
ANSWER: aromatic [or aromaticity; accept antiaromatic or antiaromaticity]
<Adam Silverman, Science - Chemistry> ~22185~ <Editor: Adam Silverman>
Data
Summary
| Tournament | Edition | Exact Match? | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|---|---|
| 2024 PACE NSC | 06/08/2024 | Y | 36 | 13.61 | 81% | 25% | 31% |