Development of the Modern Freezer. Bacteria are usually the cause of food decay, but they can't grow as well or at all in freezing temperatures, which are at 32 degrees Fahrenheit (0 degrees Celsius) or lower.
HF- polar molecule: dipole-dipole forces. There are also dispersion forces and H bond between HF. BF3- nonpolar: dispersion forces. Ar- Dispersion forces between Ar atoms.
Stronger intermolecular forces result in higher boiling points. The dipole moments increase with the polarity of the. H-X bond (the greater the difference in EN between the H and halogen atoms, the stronger the dipole-dipole. attractions.) The strength of London forces increases with the number of electrons.