06 Notes - Intermolecular Forces

06 Notes - Intermolecular Forces - Pluchino Regents...

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Pluchino – Regents Chemistry Bonding and Molecular Shape – 06 Intermolecular Forces Aim: What forces hold molecules of a substance together? Do Now: What evaporates more quickly, rubbing alcohol or water? Why? Usually, the higher the molar mass of a compound the greater the boiling point… C 20 H 42 C 8 H 18 CH 4 parafin wax gasoline methane solid liquid gas This is especially true for nonpolar molecules. With polar molecules, this is not always the case… Intermolecular Forces: attractive forces that exist between molecules, greatly impact the boiling point of a substance How do intermolecular forces impact boiling point? In order to get a substance to boil, intermolecular forces between molecules must be broken. The stronger the attraction, the higher the boiling point. Van der Waals Forces Dipole-Dipole Attraction The positive end of one molecule is attracted to the negative end of another molecule Molecule must be polar Strong intermolecular attraction
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This note was uploaded on 01/01/2012 for the course CHEM 101 taught by Professor Donahue during the Spring '11 term at Long Island U..

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06 Notes - Intermolecular Forces - Pluchino Regents...

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