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

A solute dissolves when its chemical properties are compatible with those of the solvent; for example, substances with similar polarity often mix well. Since repeated boiling and stirring do not make the solute mix, the best explanation is that the solute and solvent have different chemical properties. The temperature or pressure alone does not explain the persistent lack of mixing.

AI-written and checked against the verified answer.