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Evaporation Transitional Reasoning Practice

Chemistry · Matter · Chemistry · Separation of Mixtures

1 Chemistry practice questions on Evaporation. Questions that build towards applied reasoning.

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Questions

  1. 1.

    A chemistry student is provided with three distinct mixtures: Mixture X (fine sand suspended in water), Mixture Y (potassium nitrate fully dissolved in water), and Mixture Z (ethanol mixed with water). The student aims to recover a dry solid substance from the liquid matrix without needing to collect or condense the evaporated liquid. Which mixture should the student separate using simple evaporation, and what fundamental difference in physical properties enables this separation?

    • A) Mixture Y, because the dissolved solid solute is non-volatile compared to the liquid solvent which vaporizes into the surroundings.
    • B) Mixture X, because the insoluble solid particles readily vaporize into gas before the liquid water does upon gentle heating.
    • C) Mixture Z, because heating two miscible liquids allows the solvent to escape while leaving the other liquid behind as a dry solid residue.
    • D) Mixture Y, because the dissolved solid has a significantly lower boiling point than the water and therefore separates through early crystallization.

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