Sample Response: CS2 and COS both have London Dispersion Forces, but since COS is a polar molecule, it also exhibits dipole-dipole forces. Chlorine atom shares one valence electron of Phosphorus to complete its octet. The strength of dispersion forces increases as the total number of electrons in the atoms or nonpolar molecules increases. 3. is polar while PCl. When there is a formation of poles in the molecule or partial distribution of charges, the molecule is said to be a polar molecule. As per the molecular geometry of the molecule, the bond angle of PCl3 should be 109 degrees. However because a hydrogen atom is covalently bonded to a fluorine atom, and the same hydrogen atom interacts with a fluorine atom on another HF molecule, hydrogen bonding is possible. Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. 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Cl. Hydrogen bonds are intermolecular forces, not bonds, so they are much weaker than covalent bonds, but much stronger than other dipole-dipole attractions and dispersion forces. One needs to know the total number of valence electrons for a molecule to construct the Lewis Dot Structure. - dispersion forces dipole-dipole attraction temporary dipoles, Which of the following exhibits the weakest dispersion force? The stronger intermolecular forces cause HCl to remain liquid until higher temperatures are reached). You'll get a detailed solution from a subject matter expert that helps you learn core concepts. When comparing compounds with the same IMFs, we use size and shape as tie breakers since the London dispersion forces increase as the surface area increases. Identify the strongest intermolecular force present in pure samples of the following substances: SO2 (like water, SO2 is a bent molecule) H2O CH2Cl2. 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