Bonus
Oddly, the hexagonal form of this material is a common lubricant, while its cubic form is used as an abrasive. For 10 points each:
[10m] Name this material that forms single-atom thick nanosheets that are highly stable thermal conductors. Its hexagonal form is also known as “white graphene,” since it is isoelectronic to that compound.
ANSWER: boron nitride [or BN; accept hexagonal boron nitride or h-BN]
[10e] Unlike graphene, monolayer boron nitride has this property, making it useful as a dielectric in 2D electronics. Materials with this property generally have large band gaps and high resistivities.
ANSWER: insulating [accept word forms such as insulators]
[10h] Komatsu et al. first synthesized the extremely hard, insulating material heterodiamond by subjecting a mixture of diamond and boron nitride to these phenomena. Reflection of two of these phenomena can generate a small “stem” example of them.
ANSWER: shock waves [prompt on waves]
<Chemistry>
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Conversion
| Team | Opponent | Part 1 | Part 2 | Part 3 | Total | Parts |
|---|---|---|---|---|---|---|
| Cornell A | North Carolina A | 10 | 10 | 0 | 20 | ME |
Summary
| Tournament | Exact Match? | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|---|
| 2025 ACF Nationals | Yes | 1 | 20.00 | 100% | 100% | 0% |