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.
Since all IMF arise from the attraction of + (full, or slight) and - (full or slight), the larger molecule must have more slight + and - interactions another large molecule than occur between two small molecules. With larger molecules, there is greater surface area for these weak attractive forces to work.