free radicals - 2024 PLAYTIME

Question

In the presence of a peroxide, hydro·halogenation reactions undergo a mechanism featuring these species. For 10 points each:

[10e] Name these chemical species produced during homolytic bond cleavage. AIBN is used as a namesake “initiator” in reactions named for these species, which are characterized by possessing an unpaired electron.

ANSWER: free radicals

[10m] Radical mechanisms use arrows of this type to indicate the movement of single electrons. A description is acceptable.

ANSWER: fish-hook arrows [accept descriptions indicating a single-headed or single-barbed arrow; prompt on curved arrows]

[10h] Free radicals are often quenched by this general type of substance. Tocopherol and the hydroxyl radical are common examples of these substances, which deactivate reactive species to prevent undesirable reactions.

ANSWER: scavengers

<DN, Chemistry>

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Summary


2025 PLAYTIME @ CWRU	12/10/2024	Y	5	12.00	60%	60%	0%
2025 PLAYTIME @ Claremont	12/10/2024	Y	5	12.00	80%	40%	0%
2025 PLAYTIME @ Florida	12/10/2024	Y	2	20.00	100%	100%	0%
2025 PLAYTIME @ Florida	12/10/2024	Y	1	20.00	100%	100%	0%
2024 PLAYTIME @ Harvard	04/26/2025	Y	4	7.50	50%	25%	0%
2024 PLAYTIME @ JHU	10/26/2024	Y	8	11.25	75%	25%	13%
2025 PLAYTIME @ Northwest	12/10/2024	Y	4	12.50	75%	50%	0%
2025 PLAYTIME Online	04/26/2025	Y	9	16.67	89%	78%	0%
2025 PLAYTIME @ Sheffield	12/10/2024	Y	7	14.29	86%	57%	0%
2024 PLAYTIME @ UBC	10/05/2024	Y	8	15.00	88%	63%	0%
2024 PLAYTIME @ Virginia Tech	07/11/2025	Y	3	13.33	100%	33%	0%
2024 PLAYTIME @ WashU	10/12/2024	Y	6	18.33	100%	83%	0%

Data


Michigan A	Ohio State D	10	10	0	20
Michigan D	Pittsburgh	0	0	0	0
Michigan B	Ohio State A	10	10	0	20
Michigan C	Ohio State B	10	0	0	10
Ohio State C	Oberlin	0	10	0	10
Keeping Up With the Cardassians	Billy's Bastion	10	10	0	20
Edwin Laundrorat's Long-Lost Man Unclothès Rat Degrosses	Qin Shi Huang's Immortality Poison	10	10	0	20
Project2025BC: Make Assyria Great Again	Too much from you lately	10	10	0	20
Brandeis	BU	0	0	0	0
Belmont	Brown	0	0	0	0
Harvard	MIT	10	10	0	20
Lexington	RIT	10	0	0	10
Maryland B	CWRU	10	0	0	10
Georgetown	Catholic University of America	10	0	0	10
George Mason B	Johns Hopkins B	0	0	0	0
George Washington	NYU B	0	0	0	0
NYU A	Haverford A	10	10	0	20
Johns Hopkins A	George Mason A	10	10	10	30
Maryland A	Haverford B	10	0	0	10
Rutgers	NYU C	10	0	0	10
Arizona State University A	South Dakota School of Mines	10	10	0	20
Carleton	Washington Connections	0	0	0	0
UW A	Arizona State University B	10	10	0	20
UW B	Alberta	10	0	0	10
Art of Premature Signaling	UCLA B	10	0	0	10
P.C.‚ Daniel‚ Michel‚ and Jason B	Caltech	10	10	0	20
Claremont A	girl 15 whale i mean they	10	10	0	20
UCSB	Claremont B	0	0	0	0
UCLA A	UCSD	10	0	0	10
Cambridge	LSE	10	10	0	20
Edinburgh	Birmingham	10	10	0	20
Imperial B	Sheffield A	10	10	0	20
Sheffield B	Imperial A	10	0	0	10
Sheffield C	Lancaster + Sheffield C	0	0	0	0
Warwick A	Warwick B	10	10	0	20
Manchester	Warwick C	10	0	0	10
UBC	McGill A	0	0	0	0
Simon Fraser	McGill B	10	10	0	20
Toronto A	Toronto E	10	10	0	20
Toronto B	Waterloo C	10	10	0	20
Toronto C	Mac A	10	10	0	20
Toronto Metropolitan	Guelph	10	0	0	10
Waterloo A	Ottawa A	10	10	0	20
Toronto D	Waterloo B	10	0	0	10
2 Italians, 2 Poles, All Noles	Egypt Airlines Haters	0	0	0	0
mongeese	Auburn 2026	10	10	0	20
Free Agents 1	Gruh	10	10	0	20
Mike Dukakis Tank Battalion	Goober Gang	10	10	0	20
Notre Dame + Epic Games	Illinois Orange	10	10	0	20
evil women enjoyers	Mahjonng Masters	10	10	0	20
Monsieur Hulot's Academic Team	MSJ	10	10	0	20
we need new names	Quatumvirate	10	0	0	10
Trip-Hop Quizzer Tricky	Four Generalists in Search of a Power	10	10	0	20
Chicago A	Truman State	10	10	0	20
Illinois C	Illinois A	10	10	0	20
Iowa State	SIUE	10	10	0	20
Missouri	Illinois B	10	10	0	20
WashU Bulbasaur	Chicago B	10	10	0	20
WashU Charmander	WashU Squirtle	10	0	0	10
4 quizbowl pros go Virginia on North Carolina	Adrianne Lenker 4 Nobel Lit Prize 2K65	10	10	0	20
Ashurbanipal’s Drag Race	Master and Margaritaville	10	0	0	10
Somehow Paula Deen Returned	Even in Blacksburg There I Am	10	0	0	10