4 2 4 APPENDIX 



These hydrogens may be replaced by various molecules giving 

 rise to a large series of different compounds. 



NITROGEN-CONTAINING COMPOUNDS. 



Ammonia. The three-handed Nitrogen by linking with three 

 hydrogens forms Ammonia, 



H 



H N H 



If one of these hydrogens is removed, Amidogen, which can link 

 with other molecules, is produced. 



Amido Acids. If one of the hydrogen atoms in the radical of 

 an acid is replaced by amidogen a mon-amido acid is formed, thus : 



H 

 H x | || 



\N_C-C 0H Amido acetic acid. 

 H/ | 

 H 



When two hydrogen atoms are thus replaced, a di-amido acvl is 

 produced 



NH NH, 



i r ii 



H C - - C C H Di-amido propionic acid. 



H H 



Amides. If the amidogen molecule takes the place of the 

 hydroxyl in the carboxyl of an acid an amide results, thus : 

 



II 

 H C H Formic acid. 







/ 

 H C N< 



\H 



H 



Formamide. 



From the dibasic carbonic acid, 







H O C H 

 is formed 







Hv || /H 



\N C N< 



H/ X H 



the important substance urea. 



