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 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 “gap” bounded by the spinodal (“spy-NODE-al”) curve. Systems with this property can be separated by decanting, which is used to isolate organics from the aqueous phase after extraction. For 10 points, name this property of mixtures that cannot form a single continuous phase. ■END■
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.)
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