U1 KA3 - intermolecular forces Flashcards
van der waals forces
intermolecular forces acting between molecules
London dispersion forces
weak forces of attraction between temporary, induced dipoles in atoms or molecules
the weakest type of bonding
LDF
what are LDF formed as a result of?
electrostatic attraction between
temporary dipoles and induced dipoles caused by movement of electrons in atoms and molecules
dipole
molecule with a slightly positive end and a slightly negative end
temporary dipole
forms when there is momentarily more negative charge at one side of the molecule
ldf strength
increases with increasing molar mass
PD-PD interactions
weak intermolecular forces of attraction between permanent dipoles in polar molecules
permanent dipole
forms when atoms of substantially different electronegativity are bonded