State Bond dissociation enthalpy or energy

The strength of the chemical bond between any two species can be estimated with the help of bond dissociation enthalpy. Although it is generally measured as the enthalpy change at standard conditions (298K), the bond dissociation energy of a chemical bond is often defined as the enthalpy change of the homolytic fission of the bond at absolute zero (0K).

Some important features of the concept of bond dissociation enthalpy include:

• It is the amount of energy which needs to be supplied in order to break a chemical bond between two species.
• It is a means of calculating the strength of a chemical bond.
• In diatomic molecules specifically, it is equal to the value of bond energy
• The bond between silicon and fluorine is said to have the strongest bond dissociation enthalpy.
• Covalent bonds between atoms or molecules are said to have weak bond dissociation energies.