Types of Intermolecular Forces
What type of intermolecular force is present between nonpolar molecules?
London dispersion forces (or van der Waals forces).
Which property of a liquid increases with stronger intermolecular forces: boiling point or volatility?
Boiling Point
Between CO2 and SO2, which would have stronger intermolecular forces and why?
SO2, because it is polar and exhibits dipole-dipole interactions, whereas CO2 is nonpolar and only has London dispersion forces.
Why is ice less dense than liquid water?
In ice, water molecules are arranged in a lattice structure due to hydrogen bonding, which takes up more space and makes ice less dense than liquid water.
What is the strongest type of intermolecular force present in water?
Hydrogen Bonding
True or False: Substances with weak intermolecular forces tend to have lower melting points.
True
Which would have a higher boiling point, HCl or Cl2?
HCl, because it has dipole-dipole interactions, while Cl2 only has London dispersion forces.
Why do perfumes evaporate quickly when applied to the skin?
Perfumes contain volatile substances with weak intermolecular forces, allowing them to evaporate easily.
Who's birthday is next?
Ayaat - 2/09
What happens to the viscosity of a liquid as the strength of intermolecular forces increases?
Viscosity increases.
Why does HF have a higher boiling point than HCl, even though both are polar molecules?
HF has hydrogen bonding, which is stronger than the dipole-dipole interactions in HCl.
What type of intermolecular forces must be overcome when boiling ethanol?
Hydrogen bonding and dipole-dipole interactions.
Rank these intermolecular forces from weakest to strongest: London dispersion, dipole-dipole, hydrogen bonding.
London dispersion, dipole-dipole, hydrogen bonding.
Which type of intermolecular force would you expect to be dominant in a molecule like HCl?
Dipole-dipole interactions.
Arrange the following in order of increasing boiling point: CH4, C2H6, C3H8.
CH4, C2H6, C3H8 (boiling point increases with increasing molecular size and stronger London dispersion forces).
How do intermolecular forces explain why oil and water do not mix?
Water has strong hydrogen bonds, while oil has only London dispersion forces. The difference in intermolecular forces prevents them from mixing.