What are the 5 types of intermolecular forces? - ANS Ion-Ion
Ion-Dipole
Dipole-Dipole
Hydrogen
London Dispersion
Ion-Ion IMF - ANS occur between ionic compounds
NaCl, Al2O3
500kJ/mole to overcome these IMF
Ion-Dipole IMF - ANS occur between an ionic compound and polar molecules
aqueous compounds
10-50 kJ/mole
Dipole-Dipole IMF - ANS occur between polar molecules
interact because of unevenness of where electrons are in the molecule
3-4 kJ/mole
Hydrogen IMF - ANS dipole-dipole bond for hydrogen bonding to O,N,F
10-40 kJ/mole
London Dispersion IMF - ANS All molecules, ions, atoms, etc. have dispersion forces. These
are the weakest forces.
Unevenness at one instant
1-10 kJ/mole
What are the strongest IMF? - ANS ion-ion IMF
What are the weakest IMF? - ANS London dispersion forces
, How is boiling point related to intermolecular forces? - ANS The higher the IMF, the higher the
boiling point.
How is melting point related to intermolecular forces? - ANS The higher the IMF, the higher the
melting point.
Viscosity - ANS for a liquid, this is its resistance to flow
How is viscosity related to intermolecular forces? - ANS The higher the intermolecular forces,
the higher the viscosity.
Surface Tension - ANS how difficult it is for a liquid to spread out
How is surface tension related to intermolecular forces? - ANS The higher the intermolecular
forces, the higher the surface tension.
Sublimation - ANS A change from a solid directly to a gas
Deposition - ANS A change from a gas directly to a solid
Vaporization - ANS A change from a liquid to a gas
Condensation - ANS A change from a gas to a liquid
Fusion - ANS A change from a solid to a liquid
Freezing - ANS A change from a liquid to a solid
Which value of ΔH is favorable? - ANS ΔH<0
ΔH is negative
exothermic
Which value of ΔH is unfavorable? - ANS ΔH>0
ΔH is positive
endothermic
Which value of ΔS is favorable? - ANS ΔS>0
ΔS is positive
increasing randomness
Which value of ΔS is unfavorable? - ANS ΔS<0
ΔS is negative
decreasing randomness
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