clock reactions - Southeast

Question

The Belousov–Zhabotinsky reaction is a chemical oscillator that belongs to this class of reactions, whose “substrate-depletive” type typically consists of a slow and a fast reaction. For 10 points each:

[10m] Name this class of reactions. Hans Heinrich Landolt discovered one of these reactions in which a colorless mixture suddenly turns dark blue after a short time delay.

ANSWER: clock reactions [or chemical clocks; accept, but DO NOT REVEAL, iodine clock reaction]

[10e] The Landolt clock reaction is more commonly named for this element, which, when complexed with starch, gives the mixture its dark blue color. This purple halogen is found directly below bromine in the periodic table.

ANSWER: iodine [or I; accept iodine clock reaction; accept iodine-starch test]

[10h] The Belousov–Zhabotinsky reaction exemplifies this phenomenon, also seen with the hydrolysis of gamma valerolactone. Nonlinear rate equations and sigmoidal product formation curves can be seen in this phenomenon.

ANSWER: autocatalysis [or autocatalytic reactions]

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Summary


California	Main	Y	5	20.00	100%	100%	0%
Canada	Main	Y	6	16.67	100%	67%	0%
Florida	Main	Y	11	15.45	91%	64%	0%
Great Lakes	Main	Y	3	10.00	67%	33%	0%
Lower Mid-Atlantic	Main	Y	7	18.57	100%	71%	14%
Midwest	Main	Y	10	17.00	100%	70%	0%
North	Main	Y	9	16.67	100%	56%	11%
Northeast	Main	Y	5	16.00	100%	60%	0%
Overflow	Main	Y	4	15.00	75%	75%	0%
Pacific Northwest	Main	Y	12	16.67	92%	75%	0%
South Central	Main	Y	2	15.00	100%	50%	0%
Southeast	Main	Y	11	16.36	100%	64%	0%
UK	Main	Y	4	20.00	100%	100%	0%
Upper Mid-Atlantic	Main	Y	8	17.50	100%	63%	13%
Upstate NY	Main	Y	8	17.50	88%	75%	13%
2025 ACF Nationals	2025-08-09	Y	1	20.00	100%	100%	0%
2024 ARCADIA at UC Berkeley	04/19/2025	Y	3	16.67	100%	67%	0%

Data


Amherst B	Yale A	0	10	10
Tufts A	BC A	10	10	20
MIT A	Bowdoin B	10	10	20
Cornell-UG	Brandeis Orlando	10	10	20
Brandeis Wilson	Yale B	0	10	10
Brown A	Brandeis Clemenceau	10	10	20
Brown B	BU	0	10	10
Brown C	BC B	0	10	10
Harvard	MIT B	10	10	20
Tufts B	Dartmouth	10	10	20
Williams	Amherst A	10	10	20