Hydrogen bonds result from electrostatic attraction between oppositely charged portions of neighboring polar molecules. Van der Waals interactions are much weaker than ionic or hydrogen bonds and occur between electrically neutral molecules or parts of molecules. Hydrophobic bonds result when nonpolar molecules are mixed with polar molecules, particularly water. Hydrogen bonds between water molecules result in strong ordering of the molecules. This ordering results in physical properties such as high surface tension, high boiling point, high melting point, high heat capacity and high heat of vaporization.
Water serves as a temperature regulator.
Substances which donate hydrogen ions to a solution when dissolved in water are called acids. Substances which accept hydrogen ions in a water solution are called bases. Bases commonly dissociate to form hydroxyl ions which combine with hydrogen ions to form water. Organic molecules are the basic building blocks of living organisms on earth. Organic molecules may be viewed as a carbon core with various functional groups.