FA16_Lesson11_IntermolecularForces (1)

Clicker question set iclicker frequency to ad 7 chem

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Clicker question: set iClicker frequency to AD
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7 Chem 110: Lesson 11 The I nter M olecular ( IM ) Forces are connected to molecular properties and molecular structures. In general: IM Forces are due to electrostatic attraction , and the strength of IM forces depends on: Q : charge on ion μ : dipole moment α : Polarizability (ease with which electron clouds become distorted.) α increases as number of electrons increases α increases as size (MW) increases r : inter-particle distances. Experimentally: melting point or boiling point of a substance can be used to predict the strength of intermolecular interactions.
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8 Chem 110: Lesson 11 Effect of IM forces are additive. The overall intermolecular interactions in a substance is the sum of all IM forces present. Types of Intermolecular Forces Depends on Ion-Ion Q ionic bond Ion-Dipole Q , μ Ions in polar solvents Ion-Induced Dipole Q , α Ions in nonpolar solvents Depends on Dipole-Dipole μ Dispersion α induced-dipole induced-dipole Dipole-Induced Dipole μ , α polar molecules in nonpolar solvents Hydrogen Bonding directional must have H bonded dipole-dipole to N,O,F
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