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Effects on boiling point, viscosity and surface tension Original Scenario-Based Practice

Chemistry · States of Matter & Solutions · Chemistry · Intermolecular Forces

1 Chemistry practice questions on Effects on boiling point, viscosity and surface tension. Questions built around original scenarios.

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  1. 1.

    On the orbital research vessel Astraea, engineers evaluate two synthetic heat-transfer liquids of similar molar mass: Fluid 1, a nonpolar hydrocarbon that exhibits only London dispersion forces, and Fluid 2, a polyol containing multiple hydroxyl groups that establish an extensive intermolecular hydrogen-bonding network. After equilibrating both samples at 298 K, automated diagnostic sensors measure their macroscopic fluid behaviors. Which comparison correctly describes the physical properties of Fluid 2 relative to Fluid 1 under identical experimental conditions?

    • A) Fluid 2 exhibits a lower boiling point, lower viscosity, and lower surface tension because directional hydrogen bonds facilitate rapid molecular slippage.
    • B) Fluid 2 exhibits a higher boiling point and higher viscosity, but a lower surface tension due to diminished cohesive interactions at the liquid-vapor boundary.
    • C) Fluid 2 exhibits a higher boiling point, higher viscosity, and higher surface tension because its extensive hydrogen-bonding network creates significantly stronger cohesive intermolecular forces.
    • D) Fluid 2 exhibits a higher boiling point and higher surface tension, but a lower viscosity because hydrogen bonding aligns molecules into streamlined laminar layers.

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