IMPORTANT POINTS FOR MCQS

BOND ENERGY

Definition:             Amount of energy required to break a bond between two atoms in a di-atomic          molecule is called bond energy. Or             Bond energy may also be defined as the amount of energy released when two           atoms unite together with a covalent bond. Example:             Cl-Cl ; B.E. = 2.44 KJ/mole.             H-H ; B.E. = 4.35 KJ/mole. Unit:             Its unit is KJ/mole and Kcal/mole.             Bond breaking is an endothermic reaction. Bond formation is an exothermic             reaction, FACTORS ON WHICH BOND ENERGY DEPENDS: 1;         BOND LENGTH:             Shorter the bond length, greater is the bond energy. 2;         IONIC CHARACTER:             Greater the ionic character, greater is the bond energy.therefore             For halogen acid is       HF>HCl>HBr>HI 3;         MULTIPLE..BOND:             Multiple bonds have short length, therefore, they have high bond energy.             Triple covalent bond is stronger than double which is stronger than single covalent    bond