Water
   Water forms hydrogen bonds
with itself and molecules dissolved
in it.When salts are dissolved in
water the ionic interactions are
disrupted NaCl in water becomes
Na+ Cl-.
Water can have a power effect on
molecules that are not soluble in it.
These are nonpolar molecules such
as hydrocarbons.  Fats float on
water.  Some amino acids are polar
and other nonpolar.  Proteins are
made of both and when dissolved
in water there 3D shape is partially
determined by this interaction.