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Packet 8: Bonus 5

Answer the following about ions with the element nitrogen. For 10 points each,
[10m] The 2020 Beirut explosion was caused by 2,750 tons of the ammonium salt of this ion. The potassium salt of this ion, called saltpeter, is used in gunpowder and tree stump remover.
ANSWER: nitrate [or NO3-; accept ammonium nitrate or potassium nitrate; reject “nitrite”]
[10e] In the lab, treatment of solutions contaminated with this anion uses alkaline chlorination with bleach. This poisonous ion, present in apple seeds and cherry pits, has formula CN-.
ANSWER: cyanide [accept any answer that ends with cyanide]
[10h] The sodium salt of this anion is used at a concentration of 0.02% as an antimicrobial preservative in laboratory reagents. Upon heating, the sodium salt of this anion rapidly decomposes into sodium metal and pure nitrogen gas.
ANSWER: azide [accept sodium azide]
<Science - Chemistry, Jonathan Ouyang> | VAULT II Packet 08

HeardPPBE %M %H %
3919.2397%69%26%

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Conversion

TeamOpponentPart 1Part 2Part 3TotalParts
BathSouthampton1010020ME
CambridgeBirmingham B10101030MEH
OxfordWarperial10101030MEH
SouthperialBirmingham A1010020ME

Summary

TournamentEditionMatchHeardPPBE %M %H %
VAULT II at Georgia Tech2026-01-24✓620.00100%67%33%
Triangle Cup2026-03-13✓120.00100%100%0%
VAULT II at Eden Prairie HS2026-03-13✓316.67100%33%33%
VAULT II at McGill2026-03-13✓422.50100%75%50%
VAULT II at UCSB2026-03-13✓320.00100%67%33%
VAULT II Northern UK2026-04-24✓316.67100%67%0%
VAULT II Southern UK2026-04-24✓425.00100%100%50%
VAULT II at Harvard2026-04-30✓323.33100%100%33%
VAULT II at MINT2026-06-19✓514.0080%60%0%
VAULT II Stanford Online2026-07-17✓717.14100%57%14%