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.
The Bond Type and Structure of HF. Hydrogen fluoride is a polar covalently bonded molecule consisting of one hydrogen atom and one atom of fluorine.Hydrogen's electronegativity number is 2.1 and fluorine's is 4.0, meaning the bond is very polar and nearly ionic.Because of this, the area around the fluorine atom has a slight negative charge, while the area around the hydrogen has a slight positive one.he Bond Type and Structure of HF. Hydrogen fluoride is a polar covalently bonded molecule consisting of one hydrogen atom and one atom of fluorine.