Question
You are the loader in an M1 Abrams tank. Answer the following about the science of your ammunition, for 10 points each.
[10e] The "depleted" form of this element comprises the dense, dart-like penetrator in your armor-piercing shell. As it contains only a small amount of this element's 235 isotope, you shouldn't worry about radioactivity.
ANSWER: uranium [or U]
[10m] You are also equipped with a shell that creates a smokescreen by exposing this allotrope of phosphorus to air. This flammable allotrope owes its volatility to its strained tetrahedral structure.
ANSWER: white phosphorus [or yellow phosphorus; or tetraphosphorus; or P4]
[10h] Both depleted uranium and white phosphorus spontaneously ignite upon contact with air, a property known by this term.
ANSWER: pyrophoricity [prompt on combustible or combustibility]
<Science - Chemistry>
Data
Summary
| Tournament | Edition | Exact Match? | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|---|---|
| 2025 PACE NSC | 06/07/2025 | Y | 42 | 17.38 | 100% | 71% | 2% |