Intermolecular forces

Ion Ion Interaction

: electrostatic forces and lattice energy relation to properties.

Dipole

: one side positive and other negative; two poles of charge; polar molecule.

Lattice Energy

- the energy change upon formation of one mole of a crystalline ionic compound from its constituent ions, proportional to magnitude of charges and inversely related to distance.

Dipole Dipole Interaction

- between two dipoles opposites attracts.

Electrostatic force

opposite charges attract, proportional to charge between the two, and inversely related to the distance

EX

Na+ ion and H2O (dipole) oxygen is attracted to Na+ because of lack of stability

Dipole

one side positive and other negative; two poles of charge; polar molecule

Permanent Dipole

polar

between C3x-O

- C3x-O

polar covalent

shared unequally (intramolecular force)

covalent

shared equally (intramolecular force)

London Dispersion Force (Van Der Waals Force)

electron clouds distorted so one side is negative and one is positive which may lead to other atoms causing a momentary dipole force

Induced Dipole

when one dipole force causes another atom to exert dipole forces

Strength of Molecular Forces

Ion-Ion> Ion-Dipole> H-bond> dipole-dipole> LDF