Bonus

Complexes of this element’s trivalent ion and either di·pi·valo·metha·nato- or hepta·fluoro·octa·dio·nato- bidentate ligands can be used as chemical shift reagents for NMR. For 10 points each:
[10h] Name this element whose 3+ ion generates strong pseudocontact shifts from having six half-filled 4f orbitals. This element’s 2+ ion is the most common activating dopant for strontium aluminate phosphors.
ANSWER: europium [or Eu; accept europium(III) or Eu(III); accept europium(II) or Eu(II)]
[10e] The most common variants of NMR rely on either detecting protons or carbon atoms with this mass number, one higher than the most common carbon isotope.
ANSWER: 13 [or carbon-13]
[10m] Before using europium-based chemical shift reagents, NMR experiments are calibrated with respect to this molecule, whose single 12-proton peak has a chemical shift of zero.
ANSWER: tetramethylsilane [or TMS]
<Chemistry>
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Conversion

TeamOpponentPart 1Part 2Part 3TotalParts
British ColumbiaColumbia A10101030HEM
Chicago AWUSTL B1010020HE
Cornell ALSE10101030HEM
FloridaMIT010010E
Georgia TechColumbia B010010E
HarvardWaterloo A001010M
Illinois APenn State10101030HEM
Illinois BYale0101020EM
IndianaWUSTL A0101020EM
Iowa StateCornell B010010E
Johns HopkinsUC Berkeley B0101020EM
NYURutgers001010M
North Carolina AMaryland0101020EM
Ohio StateNorthwestern10101030HEM
RITChicago B010010E
TexasWaterloo B0101020EM
Toronto BMinnesota0101020EM
Toronto CVirginia10101030HEM
UC Berkeley AToronto A0101020EM
Virginia TechGeorgia State010010E

Summary

TournamentExact Match?HeardPPBEasy %Medium %Hard %
2025 ACF NationalsYes2019.0090%70%30%