Intermolecular
Forces
Intra vs Inter
The intermolecular forces of attraction between particles determine
whether a substance is a solid, liquid or gas at room temperature.
Intermolecular attractions are generally weak when compared to
intramolecular bonds, but span a wide range of strengths.
Types of Intermolecular forces
London Dispersion Forces
Dipole-Dipole Forces
Hydrogen Bonding
London Dispersion
The London dispersion force is a temporary attractive force
that results when the electrons in two adjacent NONPOLAR
atoms occupy positions that make the atoms form
temporary dipoles.
Remember (+) and (-) attract
Dipole-Dipole
Dipole-dipole forces are attractive forces between the
positive end of one polar molecule and the negative end
of another polar molecule.
What happens if you still push them
together?
https://phet.colorado.edu/sims/html/atomic-interactions/latest/atomic-interactions_en.html
Hydrogen Bonding
A hydrogen bond is a primarily electrostatic force of attraction
between a hydrogen atom which is covalently bound to a more
electronegative atom or group, and another electronegative atom
bearing a lone pair of electrons
https://www.youtube.com/watch?v=UukRgqzk-KE
https://www.youtube.com/watch?v=HVT3Y3_gHGg
Volatility
Boiling point relations