Question

Note to moderator: Read the answerline carefully. Entrainers that produce azeotropes (“AY-zee-oh-tropes”) with this property can be easily removed because they uniquely cross residue curve separatrices (“SEP-uh-RAY-triss-iz”). The condensation of a product with this property is essential to the function of a Dean–Stark apparatus, which is why it cannot be used to distill (10[1])ethanol. Binary azeotropes with this property are guaranteed to be minimum-boiling. Materials with low melting points and this property will form slag during smelting. Systems with this property will spontaneously decompose because they lie inside a namesake (-5[1])“gap” bounded by the spinodal (“spy-NODE-al”) curve. (-5[3])Systems with this property can be separated (10[1])by decanting, (10[1])which is used to isolate (10[2])organics from the aqueous phase after (10[2])extraction. (-5[1])For 10 points, name this (10[1])property of mixtures (10[2]-5[1])that cannot (10[2])form a single continuous phase. (10[1])■END■ (10[7]0[6])

ANSWER: immiscible (“im-MISS-ible”) [or immiscibility; accept biphasic, multiphasic, phase separable, or descriptions of two or more phases until “aqueous” is read; accept heterogeneous azeotropes or heteroazeotropes until “gap” is read and prompt afterwards; prompt on mutually insoluble or not (mutually) soluble; prompt on separable or disperse or colloidal] (Heterogeneous azeotropes are immiscible; additionally, each phase boils to a different product.)
<Chemistry>
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2024 ACF Nationals2024-04-21Y2483%0%25%117.10

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Matt SchiavonePurdueWaterloo5010
Adam FineChicago AChicago B87-5
Bryan UgazArizona StateVirginia93-5
Mason YuBrownJohns Hopkins93-5
Richard NiuCornell ANorth Carolina A93-5
Ethan AshbrookMinnesota AWUSTL A10010
Neal JoshiWUSTL BDuke10210
Derek ChenColumbia BFlorida10710
Kushal AluruRutgersOttawa10710
Shahar SchwartzBerkeley AIowa State11310
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Andrew WangIllinoisNorthwestern114-5
Andrew EllisKentuckyNorth Carolina B11910
Yashodev VyasMinnesota BCornell B122-5
Andrew HannaPennClaremont Colleges12210
Aidan FeinVanderbiltMcGill12210
Eshan PantNYUYale A12410
Jason ZhangToronto BYale B12410
Nikhil ChellamNorthwesternIllinois12910
Joseph ChambersVirginiaArizona State13010
Jonathan LauJohns HopkinsBrown13010
Robert CondronChicago BChicago A13010
Dennis ReppenChicago CHarvard13010
Todd MaslykMichiganMaryland13010
Karthik PrasadCornell BMinnesota B1300
Vincent DuNorth Carolina ACornell A13010
Jack ObermanSouth CarolinaBerkeley B1300
Rohan ShelkeBerkeley BSouth Carolina1300
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Raymond ChenToronto AGeorgia Tech13010
William HoustonChicago DTruman State1300