NMR spectroscopy - 2025 ACF Fall

Question

Tetramethylsilane is used as an internal standard for calibration in this technique’s “proton” and “carbon-13” variants. For 10 points each:

[10m] Name this spectroscopic technique in which signals are normalized to chemical shift values. This technique investigates the structure of molecules by applying a strong magnetic field before perturbing them.

ANSWER: NMR spectroscopy [or nuclear magnetic resonance spectroscopy; accept proton NMR; accept carbon-13 NMR]

[10h] The sample holders in NMR spectrometers perform this action to average out diffusional motion. In one form of NMR, this action is performed at a “magic angle” of 54.7 degrees to improve resolution.

ANSWER: spinning [accept magic angle spinning or magic angle turning; accept word forms like spun or turned; accept synonyms like rotating or word forms like rotation]

[10e] Magic angle spinning is used in a variant of NMR that analyzes samples in this state of matter. Substances in this state of matter have closely packed atoms and have a definite shape and volume.

ANSWER: solid [accept solid-state NMR or solid-state nuclear magnetic resonance]

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Summary


Northern California	Main	Y	4	22.50	100%	100%	25%
Southern California	Main	Y	7	21.43	100%	100%	14%
Eastern Canada (1)	Main	Y	4	17.50	100%	75%	0%
Eastern Canada (2)	Main	Y	9	15.56	100%	44%	11%
Florida	Main	Y	4	10.00	100%	0%	0%
Great Lakes	Main	Y	10	20.00	100%	70%	30%
Lower Mid-Atlantic	Main	Y	9	15.56	100%	56%	0%
Upper Mid-Atlantic	Main	Y	9	18.89	100%	67%	22%
Midwest	Main	Y	9	17.78	100%	78%	0%
North	Main	Y	4	17.50	100%	50%	25%
Northeast	Main	Y	12	13.33	100%	33%	0%
Pacific	Main	Y	8	16.25	100%	50%	13%
South Central	Main	Y	6	20.00	100%	83%	17%
Southeast	Main	Y	12	17.50	100%	67%	8%
Upstate NY	Main	Y	5	16.00	80%	80%	0%

Data


Berkeley Little Prince	Berkeley Mighty Miner	10	0	10	20
UCSC	Stanford A	10	0	10	20
Stanford B	Berkeley Archer Queen	10	0	10	20
UCLA C	Claremont A	10	0	10	20
UCLA A	UC Irvine	10	0	10	20
UCLA B	UCSD A	10	10	10	30
UCLA D	Claremont C	10	0	10	20
Claremont B	UCLA F	10	0	10	20
UCSD B	USC B	10	0	10	20
USC A	UC Santa Barbara	10	0	10	20
McGill A	Ottawa A	10	0	10	20
McGill C	Ottawa C	10	0	10	20
Ottawa B	McGill B	10	0	10	20
Carleton B	Ottawa D	0	0	10	10
Toronto E	McMaster A	10	0	10	20
Toronto A	McMaster C	10	0	10	20
Toronto C	Brock A	0	0	10	10
Toronto G	Queen's A	0	0	10	10
Guelph A	Toronto H	0	0	10	10
McMaster B	Toronto I	0	0	10	10
Waterloo A	Toronto B	10	10	10	30
Toronto D	Waterloo B	10	0	10	20
Waterloo C	Toronto F	0	0	10	10
ERAU Daytona A	Florida A	0	0	10	10
Florida B	Florida State A	0	0	10	10
Florida Tech A	South Florida A	0	0	10	10
Florida Tech B	UCF A	0	0	10	10
Ohio State C	Louisville B	0	0	10	10
Louisville D	WVU B	10	10	10	30
CWRU B	Michigan A	10	10	10	30
Michigan B	Louisville A	10	0	10	20
Michigan C	Ohio State B	0	0	10	10
Louisville C	Michigan State C	10	0	10	20
Michigan State A	Ohio State A	10	0	10	20
Michigan D	Ohio State D	10	10	10	30
CWRU C	Pittsburgh	10	0	10	20
WVU A	Michigan State D	0	0	10	10
JMU B	William & Mary A	0	0	10	10
Liberty A	Duke A	0	0	10	10
Virginia A	Liberty B	10	0	10	20
Liberty C	William & Mary B	0	0	10	10
NCSU A	UNC D	10	0	10	20
NCSU B	Tusculum A	10	0	10	20
UNC C	UNC A	10	0	10	20
William & Mary C	UNC B	0	0	10	10
VCU A	JMU A	10	0	10	20
George Mason A	Johns Hopkins	10	0	10	20
Lehigh B	Rutgers B	10	0	10	20
Maryland C	Columbia B	0	0	10	10
Maryland A	NYU A	10	0	10	20
Penn	Rutgers A	10	0	10	20
George Mason B	Princeton	10	0	10	20
Rutgers C	George Mason C	0	10	10	20
Rutgers D	Columbia A	10	10	10	30
Vassar A	Vassar B	0	0	10	10
Chicago A	Chicago B	10	0	10	20
Illinois Blue	Iowa B	10	0	10	20
Illinois Canada	Rose-Hulman A	10	0	10	20
Illinois Champaign	Indiana A	10	0	10	20
Illinois Orange	Purdue A	10	0	10	20
Indiana B	Illinois Urbana	0	0	10	10
Iowa A	WashU Grizzlers	10	0	10	20
Purdue B	Purdue D	10	0	10	20
William Woods University A	WashU Grolars	0	0	10	10
Macalester	Iowa State	0	0	10	10
St. Thomas	Michigan Tech	10	10	10	30
Wisconsin A	Minnesota	10	0	10	20
Wisconsin B	Wisconsin C	0	0	10	10
Amherst A	Boston College B	0	0	10	10
Boston College A	Harvard	0	0	10	10
Brown A	Boston University A	10	0	10	20
Dartmouth A	Brown B	0	0	10	10
Williams B	Dartmouth C	0	0	10	10
Boston University B	MIT A	0	0	10	10
Southern Connecticut State University A	Tufts B	0	0	10	10
Brandeis Bach	Tufts C	10	0	10	20
UConn A	Brandeis Beethoven	10	0	10	20
Vermont A	MIT B	0	0	10	10
Vermont B	Amherst B	0	0	10	10
Dartmouth B	Williams C	10	0	10	20
Arizona State B	Alberta A	10	0	10	20
Arizona State A	Washington Pink	10	0	10	20
British Columbia C	Boise State	10	0	10	20
British Columbia B	British Columbia A	0	0	10	10
Washington Chinook	Washington Atlantic	10	0	10	20
Washington Coho	Washington Steelhead	0	0	10	10
Washington Masu	Washington Chum	0	10	10	20
Washington State	Alberta B	0	0	10	10
Berkeley Boss Bandit	Berkeley Skeleton King	10	10	10	30
Kansas State A	Nebraska C	10	0	10	20
Central Oklahoma A	Nebraska A	10	0	10	20
Central Oklahoma B	Nebraska B	0	0	10	10
Tennessee B	Alabama A	0	0	10	10
Auburn B	Vanderbilt B	0	0	10	10
Auburn C	Georgia Tech B	10	0	10	20
Chipola College	Clemson B	10	0	10	20
Georgia A	Clemson C	10	0	10	20
Mississippi State A	Emory A	10	0	10	20
Georgia Tech C	Vanderbilt A	10	0	10	20
Auburn A	Georgia Tech D	10	0	10	20
Montevallo	Sewanne	0	0	10	10
Georgia Tech E	South Carolina A	10	0	10	20
Tennessee Tech	Georgia Tech F	0	0	10	10
Clemson A	Vanderbilt C	10	10	10	30
ESF	Binghamton A	0	0	10	10
Binghamton B	Binghamton C	10	0	10	20
Rochester	Cornell A	10	0	10	20
Cornell B	RIT A	10	0	0	10
Cornell C	RIT B	10	0	10	20
Oklahoma	Harding	10	0	10	20
Tulsa A	Kansas State B	10	10	10	30
Tulsa B	Rose State	10	0	10	20