Chemical formula:
 Indicate the kind and number of each type of atom in the molecule.       
 Condensed formula: Shows skeletal atoms in a
 molecule and places them in a sequential order that
 indicates bonding. 
 Structural 
 formula: Shows each atom and bonds in a molecule.     
 Line-angle formula: The hydrogen atoms are
 removed from carbon chains, leaving just a carbon line skeleton
 with functional groups attached to it.