Bonus
Some zinc-containing batteries use an unusual tetroxide of this element containing cations in the plus-one and plus-three oxidation states. For 10 points each:
[10m] Name this element whose plus-one cation is central in a diamine complex that precipitates out upon acting as an oxidizing agent. This element’s nitrate is used as a test for chloride ions.
ANSWER: silver [or Ag]
[10e] The formation of a “silver mirror” is a positive result in Tollens’ test, which distinguishes types of this functional group defined by a C–O double bond.
ANSWER: carbonyl [accept aldehyde or ketone]
[10h] Silver(I) (“silver one”) catalysts are a common choice for this reaction that starts with a diazoketone. This reaction’s ketene intermediate can undergo a two-plus-two cycloaddition to form a four-membered ring.
ANSWER: Wolff rearrangement [prompt on rearrangement]
<WashU B, Chemistry>
| Editions | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|
| 1 | 52 | 11.54 | 73% | 42% | 0% |
Conversion
Summary
| Tournament | Edition | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|---|
| California | 2025-02-01 | 3 | 10.00 | 67% | 33% | 0% |
| Great Lakes | 2025-02-01 | 5 | 8.00 | 60% | 20% | 0% |
| Lower Mid-Atlantic | 2025-02-01 | 6 | 6.67 | 50% | 17% | 0% |
| Midwest | 2025-02-01 | 6 | 15.00 | 100% | 50% | 0% |
| North | 2025-02-01 | 3 | 10.00 | 67% | 33% | 0% |
| Overflow | 2025-02-01 | 5 | 10.00 | 60% | 40% | 0% |
| Pacific Northwest | 2025-02-01 | 2 | 20.00 | 100% | 100% | 0% |
| South Central | 2025-02-01 | 2 | 15.00 | 50% | 100% | 0% |
| Southeast | 2025-02-01 | 4 | 10.00 | 75% | 25% | 0% |
| UK | 2025-02-01 | 5 | 16.00 | 80% | 80% | 0% |
| Upper Mid-Atlantic | 2025-02-01 | 8 | 13.75 | 88% | 50% | 0% |
| Upstate NY | 2025-02-01 | 3 | 6.67 | 67% | 0% | 0% |