Question
Answer the following about rhenium compounds. For 10 points each:
[10m] A rhenide ion bound to nine of these ligands constitutes the most notable example of a non•acoordinate complex. It’s not isobutyl, but two of these ligands bridge to two tetrahedral aluminum centers in the compound DIBAL (“dib-all”).
ANSWER: hydride [or H-minus; prompt on hydrogen ion or H; reject “hydronium” or “H-plus”]
[10e] In 1962, La Placa (“PLAH-kah”) and Post discovered a rhenium diboride material possessing a high value for this property. For minerals, this property is qualitatively measured using the Mohs scale.
ANSWER: hardness [accept Mohs hardness number]
[10h] One of these structures, first explicitly identified by F. Albert Cotton, appears between two rhenium atoms in potassium octachlorodirhenate (“OCK-tah-klor-roe-DAI-ree-nayt”). At ground-state, these structures can be represented with the notation sigma-2, pi-4, delta-2.
ANSWER: quadruple bonds [accept delta bonds; prompt on covalent bonds]
<Kane Nguyen, Chemistry>
Summary
| 2024 Penn Bowl Florida | 10/26/2024 | Y | 2 | 20.00 | 100% | 50% | 50% |
| 2024 Penn Bowl Harvard | 10/26/2024 | Y | 3 | 13.33 | 100% | 0% | 33% |
| 2024 Penn Bowl UK | 10/26/2024 | Y | 5 | 12.00 | 100% | 20% | 0% |
| 2024 Penn Bowl UNC | 10/26/2024 | Y | 3 | 23.33 | 100% | 100% | 33% |
Data
| Duke A | UNC A | 10 | 10 | 0 | 20 |
| UNC B | UNC C | 10 | 10 | 10 | 30 |
| Virginia Tech A | RIT A | 10 | 10 | 0 | 20 |