Question #4fa20

1 Answer
Nov 10, 2015

Van der Waals force between #H_2S# and hydrogen bond between #NH_3#.


Van der Waals' forces include all intermolecular forces that act between electrically neutral molecules. In chemistry, the van der Waals forces is the sum of the attractive or repulsive forces between molecules other than those due to covalent bonds, or the electrostatic interaction of ions with one another, with neutral molecules, or with charged molecules.

Hydrogen bonds are strong dipole-dipole attractions that involve molecules with -OH, -NH, or FH groups. When a bonded electronegative atom (oxygen, nitrogen, or fluorine) pulls electrons away from the hydrogen atom, the positive charge that results is tightly concentrated.

Hydrogen bonds are essential for building biological systems: they're strong enough to bind biomolecules together but weak enough to be broken.