Question
This is the heaviest element in a compound reaching negative 28 on the Hammett acidity function, making it trillions of times stronger than sulfuric acid. For 10 points each:
[10m] Name this metalloid whose pentafluoride makes up part of the mixture constituting a common superacid.
ANSWER: antimony [or Sb; accept fluoroantimonic acid or antimony pentafluoride]
[10h] The extreme acidity of fluoroantimonic acid derives from the presence of fluoronium ions, which readily transfer protons via this mechanism. Protons can undergo “jumping” by diffusing through a hydrogen bond network in this mechanism named for a German chemist.
ANSWER: Grotthuss mechanism
[10e] Because of its strength, fluoroantimonic acid must be stored in containers lined with Teflon because the carbon–fluoride bonds in Teflon have this chemical property. Noble gases are stable because they have this property.
ANSWER: inertness [or being chemically inert; or synonyms like being not reactive]
<Chemistry>
Summary
| 2024 ACF Winter at Clemson | 2024-11-16 | Y | 7 | 12.86 | 71% | 43% | 14% |
| 2024 ACF Winter at Lehigh | 2024-11-16 | Y | 6 | 11.67 | 67% | 33% | 17% |
| 2024 ACF Winter at Northwestern | 2024-11-16 | Y | 9 | 17.78 | 67% | 78% | 33% |
| 2024 ACF Winter at Ohio State | 2024-11-16 | Y | 7 | 7.14 | 29% | 43% | 0% |
| 2024 ACF Winter at UBC | 2024-11-16 | Y | 3 | 13.33 | 100% | 33% | 0% |
Data
| Indiana A | WashU B | 10 | 10 | 10 | 30 |
| Miami | UChicago D | 10 | 0 | 0 | 10 |
| Northwestern A | Purdue C | 10 | 0 | 10 | 20 |
| UChicago B | UChicago A | 0 | 0 | 0 | 0 |
| Purdue A | UIUC A | 10 | 0 | 10 | 20 |
| UIUC B | UChicago C | 10 | 10 | 10 | 30 |
| Purdue B | UIUC C | 10 | 10 | 10 | 30 |
| UIUC D | Purdue D | 10 | 0 | 10 | 20 |
| WashU C | WashU D | 0 | 0 | 0 | 0 |