Intermolecular Forces Flashcards
H bonding
-H atom is covalently bonded to a small, highly electronegative element:
-F, O, or N
-Strongest IMFs because it has the most polar bonds
Dipole-Dipole
attraction between + and -end of neighboring molecules
IMF’s=dipole-dipole attraction
greater electronegativity diffrence than the stronger attraction
London Dispersion
- polarization causes dipole to form then chain reaction
All molecules are LDF but more significant in larger molecules with lots of e- and larger
NP molecules are only LDF
What kind of force holds ATOMS together?
Intramolecular force, within a molecule, - or Bonds
Stronger forces than Inter
What kind of force holds MOLECULES together?
Intermolcular force, between molecules, |||| or IMFs
Weaker than Intra
Polarization
Temporary random shift of e- could towards any inside of a molecule
Viscosity
the measure the resistance of a liquid to flow
Surface tension
inward pull of particle, the energy required to increase the surface area of a liquid by a given amount
Stronger surface tension, stronger IMFs
specific heat
amount of heat required to raise temp: 1 gram, 1 degree
C
Heat
the flow of energy
Temp.
average kinetic energy (moment)
Enthalpy
energy in a system
delta H
change in enthalpy
joule/calorie
units of energy
Endothermic
feels cool
absorbs energy/to break bonds
+ H
energy in products
