Zintl phases - 2025 NAFTA

Packet 9: Bonus 6

Heating barium with arsenic leads to the formation of one of these compounds. For 10 points each:

[10h] Name these intermetallic compounds generally formed by reacting Group IA (“one-A”) or IIA (“two-A”) metals with a metalloid from a later group in the periodic table.

ANSWER: Zintl phases [or Zintl compounds; accept Zintl anions]

[10e] The first Zintl phases were formed by dissolving lead and sodium in a liquid of this compound. This compound is synthesized by hydrogenating nitrogen in the Haber-Bosch process.

ANSWER: ammonia [or NH₃; reject “ammonium” or “NH₄⁺”]

[10m] Ethylene·di·amine, crown ethers, and these ligands can chelate to cations and form Zintl phases in ammonia. These polycyclic ligands, an example of which is denoted [2.2.2] (“2, 2, 2”), are considered 3-D analogs of crown ethers.

ANSWER: cryptands [accept cryptates; accept cryptand solutions; accept [2.2.2]Cryptand or crypt-222]

<KN, Chemistry> | NAFTA-Packet-9

Heard	PPB	E %	M %	H %
35	12.00	100%	20%	0%

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Conversion

Team	Opponent	Part 2	Part 3	Total	Parts
(give me an) ANSWER: die for baseball	Muscle Mass Extinction Event	10	0	10	E
1000000 Delinquents	Execute Order 6 7	10	10	20	EM
BHSU	Indiana	10	10	20	EM
Berkeley A	Constans Constantius and Constantine Jr.	10	10	20	EM
Catholic University A	UNC Charity	10	0	10	E
Chicago !A	Northwestern	10	0	10	E
David Foster Gromit	It's something unpredictable/that in the end is right/please refrain from e-mailing my wife	10	0	10	E
Dour Straits	Dielectrical Materialism	10	0	10	E
Guelph Cloze	Licence to Bill	10	0	10	E
Habitat 67	Untitled Keyal Team	10	10	20	EM
I'm just here (being trivia club president) so I won't get fined	Licence to C. Wright Mill	10	0	10	E
In the Mood for Transportation Equipment	Invective Against Swans	10	0	10	E
Maryland F♯ A♯ ∞	Munir Siddiqui Fan Club	10	0	10	E
NYU B or not NYU B (that is the question)	Six Quizbowlers in Search of Owen Minmo	10	0	10	E
Noah Sheidlower	Negged Five Times in a Yellow Cab Against the Gottis and Gambinos	10	0	10	E
Not Old! (Old)	Team 7	10	0	10	E
Penn State	Contessa Dora	10	0	10	E
Polish Orthographers Posting Their Łs	Copán Seethe	10	0	10	E
Rosslyn Academic Team	JHU	10	0	10	E
Shipping Down from Ballston	Untitled by Alexander McQueen by Premeditated Chaos by Alexander McQueen by Percival Everett	10	10	20	EM
Stanford A	Stanford B	10	0	10	E
Strange Case of Dr. Joker and Mr. Pennywise	William of Baskerville attempts to investigate John P. Robarts, gets turned away for not having a student card	10	0	10	E
Surrealist Subcommandante Marcos be like Esto no es una pipa	The Saint-Straw that Broke the Camille's Back	10	0	10	E
Team 8	Berkeley B	10	0	10	E
The "C" Team	NYU A	10	0	10	E
The Fire Neg Time	Capital One in the Twenty-First Century	10	10	20	EM
The Third Time when she was Given to Answer the Hard and the Easy, and Answered Only the Easy	H Charlson's Washed Up Scrubs	10	0	10	E
The Unbearable Heaviness of History Players	Abbas I founded the Abbasids	10	0	10	E
The tram is not in service; please use the moving walkway.	Quebecois Olga Tokarczuk be like 'freins de jacob interdits'	10	0	10	E
UBC B	UBC A	10	0	10	E
Vacuous Tortoise	C R A B S	10	0	10	E
Where's the nearest library, I need to have a public crashout.	I fear not the man who has reviewed 10000 cards once, but I fear the man who has reviewed one card 10000 times	10	0	10	E
You Don't Have the Cards	The lion does not concern itself with negging teammates out of their own categories	10	0	10	E
consumption smoothing by borrowing future big law income	Middlesex County Fetty Wap Fan Club	10	0	10	E
https://i.imgur.com/C6nN2FE.png	Mike and Psmith	10	10	20	EM

Summary

Tournament	Edition	Match	Heard	PPB	E %	M %	H %
2026 NAFTA at Stanford	01/17/2026	✓	4	12.50	100%	25%	0%
2026 NAFTA at UBC	01/17/2026	✓	2	10.00	100%	0%	0%
2025 NAFTA Online	02/14/2026	✕	4	10.00	100%	0%	0%
2026 NAFTA at Vanderbilt	02/14/2026	✕	3	20.00	100%	67%	33%
2025 NAFTA at Toronto	09/13/2025	✓	5	10.00	100%	0%	0%
2025 NAFTA at Maryland	09/27/2025	✓	5	12.00	100%	20%	0%
2025 NAFTA at Harvard	10/04/2025	✓	3	13.33	100%	33%	0%
2025 NAFTA at Oxford	10/11/2025	✓	3	10.00	100%	0%	0%
2025 NAFTA at Chicago	11/08/2025	✓	6	13.33	100%	33%	0%
2025 NAFTA at Columbia	11/08/2025	✓	5	14.00	100%	40%	0%
2025 NAFTA at Richmond	12/20/2025	✓	2	10.00	100%	0%	0%