Azole
a class of N-containing heterocyclic five numbered ring, e.g., amidazole, 1,2,3-benzotriazole.
Azurite
Cu3 (OH)2 (CO3)2. Blue basic carbonate of copper. an artificial form is known as Blue Verditer of Blue Ashes and is used as a gem stone.
Back donation
refers to a of chemical bonding in which a ligand forms a sigmabond to an atom or ion by donating a pair of electrons, and the central atom donates electrons back by overlap of its d-orbitals with empty p-or d-orbitals on the ligand.
Backflash
rapid combustion of a material occurring in an area that the reaction was not intended for.


