Question
The energy change for gaseous ions to convert to a crystalline solid is the “lattice” version of this quantity. For 10 points each:
[10e] Name this thermodynamic quantity, symbolized H, that equals the sum of total energy and pressure times volume.
ANSWER: enthalpy
[10m] Enthalpy can be indirectly calculated according to this law, which states that the change in enthalpy of a reaction is independent of the order of its steps.
ANSWER: Hess’s Law
[10h] Hess’s law underlies a “cycle” named for Fritz Haber and this scientist that is used to calculate lattice enthalpy. This scientist and Oppenheimer name an approximation that involves treating the nucleus’s position as fixed.
ANSWER: Max Born [accept Born-Haber cycle or Born rule]
<Chemistry>
Summary
| 2024 ACF Fall at Cornell | fall | Y | 9 | 15.56 | 78% | 33% | 44% |
| 2024 ACF Fall at Ohio State | fall | Y | 8 | 18.75 | 75% | 75% | 38% |
| 2024 ACF Fall at Washington | fall | Y | 6 | 16.67 | 67% | 50% | 50% |
| 2024 ACF Fall at Georgia | fall | Y | 11 | 17.27 | 82% | 46% | 46% |
| 2024 ACF Fall at North Carolina | fall | Y | 10 | 17.00 | 100% | 30% | 40% |
| 2024 ACF Fall at Claremont Colleges | fall | Y | 5 | 24.00 | 80% | 80% | 80% |
| 2024 ACF Fall at Rutgers | fall | Y | 8 | 16.25 | 88% | 25% | 50% |
| 2024 ACF Fall at Illinois | fall | Y | 9 | 24.44 | 89% | 67% | 89% |
Data
| Claremont A | Claremont B | 10 | 10 | 10 | 30 |
| Claremont C | USC | 10 | 10 | 10 | 30 |
| UCLA B | UCLA A | 0 | 0 | 0 | 0 |
| UCLA D | UCLA C | 10 | 10 | 10 | 30 |
| UCLA E | UCSD | 10 | 10 | 10 | 30 |