Urea, (NH 2 ) 2 CO, is used in plastics and fertilizers. It is also the primary

Question:

Urea, (NH₂)₂CO, is used in plastics and fertilizers. It is also the primary nitrogen-containing substance excreted by humans.
(a) Which bonds in the molecule are polar, and which are nonpolar?
(b) Which is the most polar bond in the molecule? Which atom is the negative end of the bond dipole? :0: H-NC-N-H Urea