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.
Beau 12/02/99 Vocabulary dipole-dipole force dipole moment hydrogen bonding intermolecular force London force van der Waals force Molecules can attract each other at moderate distances and repel each other at close range. The attractive forces are collectively called van der Waals forces. Van der Waals forces are much weaker than chemical bonds, and random thermal motion around room temperature can usually overcome or disrupt them. Intermolecular forces are feeble; but without them, life as we know it would be impossible.