Packet 5: Bonus 7
Simulations of these things may use the gradient of the Lennard-Jones potential to generate a force field. For 10 points each:
[10h] Name these things. The Born–Oppenheimer approximation is used when simulating the trajectories of these things in a technique known as their namesake “dynamics.”
ANSWER: molecules [accept molecular dynamics; accept atoms]
[10e] A term proportional to “distance to the power of negative six” in the Lennard-Jones potential represents the London dispersion force, which belongs to this class of weak intermolecular forces named for a Dutch scientist.
ANSWER: van der Waals forces
[10m] The repulsive term in the Lennard-Jones potential is proportional to “distance to the power of negative [this number].” The SI prefix “pico-” (“pee-ko”) is equivalent to a factor of “ten to the power of negative [this number].” Your answer should be a positive number.
ANSWER: 12 [or twelve; reject “negative 12”]
<Editors, Chemistry> | Packet E
| Editions | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|
| 2 | 119 | 17.23 | 92% | 70% | 11% |
Conversion
| Team | Opponent | Part 1 | Part 2 | Part 3 | Total | Parts |
|---|---|---|---|---|---|---|
| Columbia A | Columbia B | 0 | 10 | 10 | 20 | EM |
| George Mason A | Maryland C | 0 | 10 | 10 | 20 | EM |
| George Mason B | Maryland A | 0 | 10 | 0 | 10 | E |
| George Mason C | NYU A | 0 | 0 | 0 | 0 | |
| Johns Hopkins | Rutgers D | 10 | 10 | 10 | 30 | HEM |
| Lehigh A | Rowan | 0 | 10 | 10 | 20 | EM |
| Maryland B | NYU C | 10 | 10 | 10 | 30 | HEM |
| Princeton | Rutgers C | 10 | 10 | 10 | 30 | HEM |
| Rutgers A | Rutgers B | 0 | 10 | 10 | 20 | EM |
| Stony Brook | NYU B | 0 | 10 | 10 | 20 | EM |
| Vassar A | Penn | 0 | 10 | 10 | 20 | EM |
| Vassar B | Lehigh B | 0 | 10 | 10 | 20 | EM |
Summary
| Tournament | Edition | Exact Match? | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|---|---|
| UK (North) | UK | Y | 5 | 12.00 | 60% | 60% | 0% |
| UK (South) | UK | Y | 8 | 15.00 | 88% | 63% | 0% |
| Northern California | US | Y | 4 | 20.00 | 100% | 75% | 25% |
| Southern California | US | Y | 7 | 20.00 | 100% | 86% | 14% |
| Eastern Canada (1) | US | Y | 5 | 12.00 | 80% | 40% | 0% |
| Eastern Canada (2) | US | Y | 9 | 16.67 | 100% | 56% | 11% |
| Florida | US | Y | 4 | 17.50 | 100% | 75% | 0% |
| Great Lakes | US | Y | 11 | 18.18 | 100% | 64% | 18% |
| Lower Mid-Atlantic | US | Y | 9 | 14.44 | 89% | 56% | 0% |
| Upper Mid-Atlantic | US | Y | 1 | 20.00 | 100% | 100% | 0% |
| Upper Mid-Atlantic | US | Y | 9 | 20.00 | 89% | 78% | 33% |
| Upper Mid-Atlantic | US | Y | 2 | 20.00 | 100% | 100% | 0% |
| Midwest | US | Y | 9 | 15.56 | 89% | 67% | 0% |
| North | US | Y | 4 | 22.50 | 100% | 100% | 25% |
| Northeast | US | Y | 1 | 10.00 | 100% | 0% | 0% |
| Pacific | US | Y | 8 | 17.50 | 100% | 75% | 0% |
| South Central | US | Y | 6 | 11.67 | 67% | 50% | 0% |
| Southeast | US | Y | 12 | 21.67 | 92% | 100% | 25% |
| Upstate NY | US | Y | 5 | 18.00 | 100% | 60% | 20% |