blue - 2024 ACF Regionals @ Cornell

Question

Solvating electrons by dissolving alkali metals in ammonia produces a solution of this color. For 10 points each:

[10e] Name this color given by cobalt and copper in the flame test. A pigment of this color that consists of repeating subunits of iron complexed to six cyanide ligands is named “Prussian.”

ANSWER: blue [accept Prussian blue]

[10h] Color can briefly be granted to metal oxide crystals by irradiating them to form these defects, in which unpaired electrons become wedged in vacancies within the crystal lattice.

ANSWER: F centers [or Farbe centers]

[10m] F-center coloration is particularly prominent in the oxide of this element, which is a white pigment that turns yellow when heated. The crystal structure of this metal’s “blende” is identical to that of diamond.

ANSWER: zinc [accept zincblende; accept zinc oxide]

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Summary


2024 ACF Regionals @ Berkeley	01/27/2024	Y	3	16.67	100%	67%	0%
2024 ACF Regionals @ Cornell	01/27/2024	Y	3	13.33	100%	33%	0%
2024 ACF Regionals @ JMU	01/27/2024	Y	9	12.22	100%	22%	0%
2024 ACF Regionals @ Minnesota	01/27/2024	Y	2	15.00	100%	50%	0%
2024 ACF Regionals @ Nebraska	01/27/2024	Y	6	10.00	100%	0%	0%
2024 ACF Regionals @ Rutgers	01/27/2024	Y	5	14.00	100%	40%	0%
2024 ACF Regionals @ Imperial	01/27/2024	Y	4	15.00	100%	50%	0%

Data


Cornell A	Binghamton	10	0	10
Cornell B	Cornell C	10	10	20
RIT B	RIT A	10	0	10