surfactants - 2025 ACF Fall

Question

These molecules have good foaming ability when their head group is anionic. For 10 points each:

[10m] Name these molecules, the main active ingredient of detergents. These amphiphilic molecules aggregate into spherical micelles that remove grease and soiling particles.

ANSWER: surfactants [or surface-active agents; accept anionic surfactants]

[10h] Detergent surfactants reduce the surface tension of water by undergoing this process at the liquid-air interface. Irving Langmuir developed an isotherm model of this process that assumes the formation of a monolayer.

ANSWER: adsorption [accept word forms like adsorbing; accept Langmuir adsorption isotherm or Langmuir adsorption model; prompt on binding; reject “absorption”]

[10e] Many detergents also contain enzymes, biological examples of these substances. These substances increase the rate of chemical reactions but are not consumed in the process.

ANSWER: catalysts

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Summary


Northern California	Main	Y	4	25.00	100%	100%	50%
Southern California	Main	Y	7	14.29	100%	29%	14%
Eastern Canada (1)	Main	Y	4	12.50	100%	25%	0%
Eastern Canada (2)	Main	Y	9	11.11	89%	22%	0%
Florida	Main	Y	4	15.00	100%	50%	0%
Great Lakes	Main	Y	11	16.36	100%	55%	9%
Lower Mid-Atlantic	Main	Y	9	14.44	100%	33%	11%
Upper Mid-Atlantic	Main	Y	9	13.33	100%	22%	11%
Midwest	Main	Y	9	14.44	89%	33%	22%
North	Main	Y	4	17.50	100%	50%	25%
Pacific	Main	Y	8	15.00	100%	50%	0%
South Central	Main	Y	6	15.00	100%	50%	0%
Southeast	Main	Y	12	10.83	100%	8%	0%
UK (North)	UK	Y	5	12.00	100%	0%	20%
UK (South)	UK	Y	8	11.25	100%	0%	13%
Upstate NY	Main	Y	1	20.00	100%	100%	0%

Data


Berkeley Archer Queen	Stanford A	10	10	10	30
Berkeley Boss Bandit	Berkeley Mighty Miner	10	0	10	20
Berkeley Skeleton King	UCSC	10	10	10	30
Stanford B	Berkeley Little Prince	10	0	10	20
USC A	Claremont C	10	0	10	20
UC Santa Barbara	Claremont B	0	0	10	10
UCLA A	Claremont A	10	0	10	20
UCLA B	UCLA C	0	10	10	20
UCSD A	UCLA E	0	0	10	10
UCLA F	UCSD B	0	0	10	10
USC B	UCLA D	0	0	10	10
Carleton A	Ottawa B	0	0	10	10
McGill E	Carleton B	0	0	10	10
McGill B	Ottawa C	10	0	10	20
Ottawa D	Ottawa A	0	0	10	10
Guelph A	Toronto A	0	0	10	10
Toronto C	McMaster A	10	0	10	20
Waterloo A	McMaster B	10	0	10	20
Toronto B	Queen's A	0	0	10	10
Toronto E	Waterloo C	0	0	10	10
Brock A	Toronto F	0	0	0	0
Toronto D	Toronto H	0	0	10	10
Toronto G	Toronto I	0	0	10	10
McMaster C	Waterloo B	0	0	10	10
Florida Tech B	Florida A	0	0	10	10
Florida State A	ERAU Daytona A	10	0	10	20
Florida B	Florida Tech A	10	0	10	20
UCF A	South Florida A	0	0	10	10
CWRU A	CWRU D	10	10	10	30
Ohio State C	Kentucky	0	0	10	10
Louisville B	Michigan State B	10	0	10	20
Louisville C	Ohio State B	10	0	10	20
Michigan B	Michigan State D	10	0	10	20
Michigan State C	Michigan C	0	0	10	10
Virginia Tech B	JMU A	10	0	10	20
William & Mary A	Liberty A	0	0	10	10
Liberty C	Liberty B	0	0	10	10
Virginia Tech C	NCSU A	0	0	10	10
UNC A	NCSU B	10	0	10	20
VCU A	Tusculum A	10	0	10	20
UNC B	Virginia Tech A	0	0	10	10
Virginia A	UNC D	0	10	10	20
Duke A	William & Mary C	0	0	10	10
Lehigh A	George Mason A	0	0	10	10
Maryland B	Vassar B	0	0	10	10
Maryland C	Johns Hopkins	0	0	10	10
NYU B	Princeton	0	0	10	10
Rutgers A	Lehigh B	10	10	10	30
Rutgers B	NYU C	0	0	10	10
Maryland A	Rutgers C	0	0	10	10
Rutgers D	Rowan	10	0	10	20
George Mason B	Stony Brook	0	0	10	10
Illinois Urbana	Chicago A	0	0	10	10
Chicago B	Purdue C	10	0	10	20
Illinois Canada	Purdue D	0	0	10	10
Illinois Champaign	Rose-Hulman A	0	0	10	10
Illinois Orange	Iowa A	0	10	10	20
Indiana A	Iowa B	0	0	0	0
Indiana B	Purdue A	0	0	10	10
Illinois Blue	WashU Grolars	10	10	10	30
Purdue B	William Woods University A	10	0	10	20
Iowa State	Minnesota	10	10	10	30
Macalester	Michigan Tech	0	0	10	10
Wisconsin A	Wisconsin B	0	0	10	10
St. Thomas	Wisconsin C	10	0	10	20
Washington Chum	Arizona State A	10	0	10	20
Washington Atlantic	Arizona State B	0	0	10	10
Washington State	Boise State	10	0	10	20
Alberta A	British Columbia A	0	0	10	10
Washington Steelhead	British Columbia B	10	0	10	20
Texas	Washington Chinook	0	0	10	10
British Columbia C	Washington Pink	0	0	10	10
Washington Sockeye	Alberta B	10	0	10	20
Kansas State A	Rose State	0	0	10	10
Murray State College B	Kansas State B	10	0	10	20
Murray State College A	Nebraska A	0	0	10	10
Oklahoma	Nebraska B	0	0	10	10
Tulsa A	Harding	10	0	10	20
Central Oklahoma A	Tulsa B	10	0	10	20
South Carolina A	Alabama A	0	0	10	10
Vanderbilt C	Auburn C	0	0	10	10
Clemson A	Georgia Tech A	0	0	10	10
Georgia Tech D	Clemson C	0	0	10	10
Georgia A	Tennessee B	0	0	10	10
Georgia Tech E	Georgia Tech B	0	0	10	10
Georgia Tech C	Emory A	0	0	10	10
Mississippi State A	Georgia Tech F	0	0	10	10
Vanderbilt B	Montevallo	0	0	10	10
Clemson B	Sewanne	0	0	10	10
Chipola College	Tennessee Tech	10	0	10	20
Vanderbilt A	Tennessee A	0	0	10	10
Ohio State A	Michigan D	10	0	10	20
Michigan State A	Louisville D	0	0	10	10
CWRU B	Pittsburgh	10	0	10	20
Louisville A	WVU A	0	0	10	10
WVU B	Ohio State D	0	0	10	10
Durham D	Durham A	0	0	10	10
Durham C	Durham B	0	0	10	10
Edinburgh D	Edinburgh B	0	0	10	10
Sheffield B	Edinburgh A	0	10	10	20
York	Sheffield A	0	0	10	10
Cambridge B	Cambridge D	0	0	10	10
Cambridge E	Cambridge C	0	10	10	20
LSE	Cardiff	0	0	10	10
Imperial B	Southampton	0	0	10	10
Imperial C	Imperial A	0	0	10	10
Imperial D	Cambridge A	0	0	10	10
Oxford	Birmingham	0	0	10	10
Warwick	Bristol	0	0	10	10
RIT A	Cornell D	10	0	10	20