Packet 2: Bonus 16
Fourteen of these structures including “orthorhombic” were proposed by Auguste Bravais (“brah-vay”). For 10 points each,
[10e] Name these repeating arrays of points that define the arrangement of atoms in a crystal.
ANSWER: lattices [accept crystal lattices or Bravais lattices]
[10h] The intersection of planes with crystalline lattices can be described by these indices. To calculate these indices, one takes the reciprocal of the plane’s intercepts with the coordinate axes.
ANSWER: Miller indices
[10m] The body-centered cubic unit cell, which can build a Bravais (“brah-vay”) lattice, contains this many atoms. Contributions from this many ions are depicted in a Born-Haber Cycle.
ANSWER: Two atoms
<Science - Chemistry, Rohan Ganeshan> | VAULT II Packet 02
| Heard | PPB | E % | M % | H % |
|---|---|---|---|---|
| 42 | 15.00 | 83% | 29% | 38% |
Conversion
Summary
| Tournament | Edition | Match | Heard | PPB | E % | M % | H % |
|---|---|---|---|---|---|---|---|
| VAULT II at Georgia Tech | 2026-01-24 | ✓ | 6 | 15.00 | 83% | 33% | 33% |
| Triangle Cup | 2026-03-13 | ✓ | 2 | 10.00 | 50% | 50% | 0% |
| VAULT II at Eden Prairie HS | 2026-03-13 | ✓ | 3 | 16.67 | 100% | 0% | 67% |
| VAULT II at McGill | 2026-03-13 | ✓ | 3 | 16.67 | 100% | 0% | 67% |
| VAULT II at UCSB | 2026-03-13 | ✓ | 5 | 10.00 | 100% | 0% | 0% |
| VAULT II Northern UK | 2026-04-24 | ✓ | 3 | 6.67 | 67% | 0% | 0% |
| VAULT II Southern UK | 2026-04-24 | ✓ | 4 | 17.50 | 75% | 50% | 50% |
| VAULT II at Harvard | 2026-04-30 | ✓ | 3 | 13.33 | 100% | 0% | 33% |
| VAULT II at MINT | 2026-06-19 | ✓ | 5 | 16.00 | 80% | 60% | 20% |
| VAULT II Stanford Online | 2026-07-17 | ✓ | 8 | 20.00 | 75% | 50% | 75% |