lesson 3.1 Flashcards
intramolecular force
the force with in a molecule (covalent)
intermolecular forces
forces between 2 diff molecules
Dipole-dipole interactions (3)
occur between any 2 polar molecules
can be attractive or repulsive
molecules orient them selves to maximize attraction
the strength is directly proportional to the magnitude of the dipole
Dipole-induced dipole interactions (3)
between polar and non polar , the non polar temporarily becomes polar
it depends on the proximity of and the orientation of the polar molecule
always attractive
induced dipole - induced dipole interactions (2)
between 2 non polar molecules
it produce temporary dipoles and attract the opposite charge and it polarizes the other molecule
London dispertion
London dispersion (4)
all molecules exhibit LDFS including polar molecules
primary attraction between non polar molecules
the larger the molecule the stronger the LDF
stronger LDF higher the boiling and melting point and higher the surface area
Hydrogen bonding (3)
stronger dipole-dipole interactions
between molecules
between atom and a highly electronegative electron N,O,OR F
Ion - dipole interaction (2)
occurs when ionic compounds resolve in aqueous solutions the dipole of the water interacts w the charged ions and cause them to seperate
ion-dipole interactions are even stronger than hydrogen bonding
properties that increase as imfs increase (4)
melting and boiling points
surface tention
viscosity
heat of vaporization
vapor pressure
the pressure exerted by a gas when it is at equilibrium with its liquid in a closed container
viscosity
resistance of flow
surface tention
ability of the surface of a liquid to resist an external force
comparing the magnitudes of imfs in 2 diff substances
if 2 molecules are significantly different in size and experience diff imfs , it is difficult to determine which one will experience more ima from only the structure of electrons
a good way to determine imfs is through comparing boiling points
