AP Chemistry : Intermolecular Forces
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Example Questions
Example Question #21 : Intermolecular Forces
Which of the following compounds will likely have the highest boiling point, and why?
Stronger intermolecular forces (IMFs) hold molecules together, so the strongest IMFs will produce the highest boiling points because more energy will be required to disrupt those bonds and cause a phase shift.
The answer is that 
Example Question #21 : Intermolecular Forces
All molecules have what type of intermolecular force?
Ionic
Hydrogen bonding
Dipole-dipole
London dispersion
Covalent
London dispersion
London dispersion forces are weak attractive forces between molecules or atoms. They involve transient induced polarization of atoms and/or electrons that cause two separate atoms or molecules to be attracted to each other.
Example Question #21 : Intermolecular Forces
The stronger the intermolecular forces, __________.
the higher the boiling point
the higher the molar mass
the lower the surface tension
the lower the viscosity
the higher the vapor pressure
the higher the boiling point
The stronger the intermolecular forces, the higher the: boiling point, surface tension, and viscosity; and the lower the vapor pressure. A bigger molar mass doesn't necessarily mean that there are stronger intermolecular forces (that is determined by the type of intermolecular forces present).
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