Chapter 11: IMF & Phase Changes Flashcards
intramolecular forces
-forces btwn atoms within a molecule
intermolecular forces
- IMF
- forces btwn atoms of separate molecules
types of intramolecular forces
- ionic
- metallic
- covalent
types of intermolecular forces
- london dispersion forces
- dipole-dipole
- h-bonding
- ion dipole
which forces are stronger: intramolecular or intermolecular forces?
-intramolecular forces
what causes the IMF to increase in london dispersion forces?
-inc. molar mass & the more linear shape
dipole-dipole forces
- attraction btwn neutral polar molecules
- based on polarity
h-bonding
- FON
- extra strong dipole-dpiole force
ion-dipole forces
-exists btwn ions and partial charges of polar molecules
what causes an increase in attractio in ion-dipole forces?
increases with:
- charge of ion
- magnitude of ion
viscosity
- resistance of a liquid to flow
- strong forces prevent flow
if you increase the boiling point, what happens to their intermolecular forces?
-stronger IMF
if you increase the viscosity, what happens to their intermolecular forces?
- stronger IMF
- strong forces prevents flow
if you decrease the surface tension, what happens to their intermolecular forces?
- weaker IMF
- weak forces allow less stretch of surface
if you increase the vapor pressure, what happens to their intermolecular forces?
- weaker IMF
- weak forces means easier for molecules to escape liquid (resulting in high VP)
