Ücretsiz Kullanmaya Başla
PDF Downloads

London dispersion forces

Chemistry • Intermolecular Forces • Transitional Reasoning • 1 questions

London dispersion forces Transitional Reasoning Download PDF

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

1 Chemistry practice questions on London dispersion forces. Questions that build towards applied reasoning.

Questions

  1. 1.

    A chemistry student investigates four nonpolar molecular substances with identical geometries to understand their phase differences at room temperature. The measured boiling points increase systematically from substance W (-188 °C), to substance X (-34 °C), substance Y (59 °C), and substance Z (184 °C), which correlates directly with an increase in their total electron counts from 18 to 106 electrons. Based on this investigation, which statement correctly explains the trend in the strength of London dispersion forces among these substances?

    • A) Larger molecules establish stronger permanent dipoles because their outer valence electrons are held more loosely by the nuclei.
    • B) Substance W exhibits the weakest intermolecular attractions because smaller electron clouds undergo distortion far more readily, causing mutual electrostatic repulsion.
    • C) The progressive rise in boiling point is primarily driven by stronger intramolecular covalent bonds resisting thermal decomposition during vaporization.
    • D) Substance Z exhibits the highest boiling point because its larger, more diffuse electron cloud has greater polarizability, yielding stronger temporary and induced dipoles.