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.
INTERMOLECULAR FORCES. Intermolecular forces are noncovalent forces between molecules. There are a variety of these forces but the most common are: dipole-dipole interactions, hydrogen bonding and van der Waals (or London) forces. Of these, hydrogen bonds are the strongest followed by dipole-dipole interactions and finally, van der Waals forces.