Patterns of Chemical Reactions 
     Chemical reactions involve the breaking or making of covalent bonds.
     There are three kinds:
   (Dehydration) Synthesis reaction
  Synthesis reactions occur when atoms or molecules combine to form larger molecules. Synthesis reactions involve bond formation and require energy.
  Decomposition (Hydrolysis) reaction
  Decomposition reactions occur when a molecule is broken down into smaller molecules. Decomposition reactions involve the breaking of bonds and release energy.
  Exchange reaction
  Exchange reactions occur when bonds are both made and broken and involve the exchange of parts between two molecules.