Question

This species corresponds to the 45 peak when quantifying it using IRMS. Polarization is transferred onto this species to determine its chemical identity in a technique called DEPT. This is the lighter (-5[1])of two species whose concentration is diluted in the Suess effect. The use of this isotope's concentration (-5[2])to detect (-5[1])synthetic testosterone, adulterated (-5[1])food, and infer prehistoric diets (15[1])comes from its different isotopic signatures (-5[1])in C3 and C4 (*) photosynthesis. Chemical shifts between 0 (10[1])and 220 ppm are detected in a form of NMR (10[1])using (10[2])this isotope, (10[7])the second (10[1])most-common (10[1])form after (-5[1])proton NMR. (-5[1])This stable isotope's natural ratio is 1.1%, (10[1])and has one fewer neutron than (10[1])a radioactive isotope (-5[1])with a half-life (10[1])of 5700 years. (10[2]-5[2])For 10 points, name this isotope of Carbon (10[1]-5[1])that has seven (10[1])neutrons. (10[3])■END■ (10[8]0[1])

ANSWER: carbon-13 [or C-13; prompt on carbon; reject “carbon-12” or “carbon-14”]
<VD, Chemistry>
= Average correct buzz position

Summary

2024 ARCADIA at Claremont2024-11-02Y3100%0%0%92.67
2024 ARCADIA at Waterloo2024-11-09Y6100%17%50%98.50
2024 ARCADIA at Illinois2024-11-09Y4100%0%50%106.25
2024 ARCADIA at UC Berkeley2024-12-06Y2100%0%100%125.00
2024 ARCADIA at Duke2024-12-06Y3100%0%0%108.00
2024 ARCADIA at GT2024-12-06Y5100%0%40%111.80
2024 ARCADIA at Warwick2024-12-06Y4100%0%25%95.75
2024 ARCADIA at Florida Tech2024-12-06Y4100%0%25%106.25
2024 ARCADIA Online2025-05-17Y1100%0%100%128.00

Buzzes

PlayerTeamOpponentBuzz PositionValue
Shahar SchwartzBerkeley PastBerkeley A31-5
Benjamin ChapmanToronto AWaterloo Aspidistra48-5
Andrew WangIllinois BlueChicago A48-5
Hansen JinBerkeley BStanford50-5
Camden WilliamsToyota Tundra Turbos — Twisting Truths - Tackling Trivia - Taming TitansIn the Mood for Buzz53-5
James WangOttawa AbsolomabsolomabsolomWaterloo Basic5815
Shaun IyerInnovation Academy AMilton64-5
Ethen SunToronto BToronto Disband the Club 2k247310
Shiva TegullaUCF AUF A8310
Yash MandaviaIllinois OrangeNotre Dame8410
Rachel BenthamCambridge BLSE A8410
Rasheeq AzadNorth Carolina BSouth Carolina8610
Bill ZhaoUF BUF C8610
Matthew WestleyPurdue AChicago B8610
Joel DickerSouthamptonImperial B8610
Brendan BethlehemCambridge ALSE B8610
Akshay SeetharamClaremontALCU8610
Will AlstonSGV VenturesAnderson et al.8610
Matthew SumanenGeorgia Tech BGeorgia Tech A8810
Yusuf BaigMcMaster ApocolocyntosisBidiiCarleton A8910
Asha BasuMcGill AWaterloo Cloze91-5
James ByrneBristolImperial A93-5
Zach TsengGeorgia Tech DMississippi State10010
Travis TuJason et al.U[C]SD10610
Sanjay Shanmuga PerumalLambertJohns Creek109-5
Thomas GlotfeltyVirginia Tech BVirginia Tech C11210
Michael DuWaterloo AspidistraToronto A11510
Franklin WuToronto Chestnut Rice and KamehamehaToronto Metropolitan A115-5
Alex ThomasGeorgia Tech CInnovation Academy C11510
Logan MathisSIUEPurdue B115-5
Aidan BernardoFlorida TechUSF123-5
Vinu HariharStanfordBerkeley B12310
Noah ChinVirginia Tech ANorth Carolina A12610
Swapnil GargBerkeley ABerkeley Past12710
Ezra SantosChicago AIllinois Blue12710
Paphon SusikakosolImperial ABristol12710
Moses KitakuleIn the Mood for BuzzToyota Tundra Turbos — Twisting Truths - Tackling Trivia - Taming Titans12810
Addison WigginsUSFFlorida Tech12810
Rivera RiveraValenciaUCF B1280
Sophie TorresUCF BValencia12810
Ishan JoshiToronto Metropolitan AToronto Chestnut Rice and Kamehameha12810
James TangWaterloo ClozeMcGill A12810
Edward KimJohns CreekLambert12810
Darren KellisMiltonInnovation Academy A12810
Hayden WillettPurdue BSIUE12810