A chemical bond is a force of attraction between two atoms. Breaking the bond requires input of energy. it is therefore an endothermic process.
The energy change required to break a bond depends on the atoms that form the bond. The energy required to break a particular bond is the dissociation enthalpy.
Bond formation is a process that where energy is released. It is therefore an exothermic process.
The amount of energy released is when a particular bond is broken is the same magnitude as the energy taken in when the bond is broken, just the opposite sign.
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