intermolecular

intermolecular - point, melting point. IV. If two compounds...

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Cut to the Chase: Intermolecular Attractions I. Intermolecular attractions from strongest to weakest A. Ion-Ion - Ionic compounds (metal/non-metal) B. Hydrogen Bonding - Compounds containing H attached to N, O, or F C. Dipole-Dipole - polar compounds D. London Dispersion Forces - All compounds exhibit these, however they are most important with non-polar compounds. II. Questions pertaining to intermolecular attractions: A. Which compound has the highest boiling point, melting point, and highest heat of vaporization corresponds to the compound with the strongest intermolecular attractions. B. Which compound has the highest vapor pressure corresponds to lowest intermolecular attractions. III. If two compounds are both non-polar, the compound with the greatest molecular mass has the greater London Dispersion Forces and will have the greater boiling
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Unformatted text preview: point, melting point. IV. If two compounds are both ionic, the compound which contains the ions with the greatest charge has the greater intermolecular attraction. If ions have the same charge, the smallest ions have the greatest intermolecular attractions. Example Problem: Arrange in order from highest to lowest melting point: NaCl, CO 2 , Ne, CaCl 2 , H 2 O, H 2 S. Go back to number I on this page and decide what attraction is in each: NaCl ( ion/ion), CO 2 ( London), Ne (London), CaCl 2 (ion/ion), H 2 O (H-Bonding), H 2 S( dipole/dipole) If two contain the same attraction, use III and IV to delineate between them: Answer: CaCl 2 , NaCl, H 2 O, H 2 S, CO 2 , Ne...
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