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Effects on boiling point, viscosity and surface tension Transitional Reasoning Practice

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

1 Chemistry practice questions on Effects on boiling point, viscosity and surface tension. Questions that build towards applied reasoning.

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  1. 1.

    In an investigation of liquid behavior, a student tests three pure substances of similar molecular weights: Liquid X, Liquid Y, and Liquid Z. The student records that a small steel sphere takes the longest time to sink through Liquid Z, which also forms high, rounded droplets on a nonpolar surface, whereas Liquid X boils at the lowest temperature at 1 atm. Based on these observations, which conclusion correctly explains the relationship between the intermolecular forces and the physical properties of these liquids?

    • A) Liquid X possesses the strongest intermolecular attractions, which allows its molecules to overcome cohesion with minimal thermal energy and vaporize readily at lower temperatures.
    • B) Liquid Z exhibits high surface tension because weak cohesive attractions permit surface molecules to spread outward toward the surrounding atmosphere.
    • C) Liquid Z has the strongest intermolecular attractions, which accounts for both its high resistance to internal flow and its pronounced resistance to surface expansion compared to Liquids X and Y.
    • D) Liquid Y must have a higher viscosity than Liquid Z because stronger attractive forces generally facilitate the smooth sliding of liquid layers past each other.

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