A substance is boiled repeatedly and stirred, but the solute never mixes with the solvent. Which best describes why?

Boiling and stirring can help a soluble solute dissolve, but they cannot make every pair of substances mix. Whether substances dissolve depends largely on their chemical properties and how they interact. So the best explanation is that the solute and solvent have different chemical properties; being saturated does not explain why the solute never mixes.

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