When talking about heat changes during a chemical reaction, reactions can be classified into two types:
A chemical reaction is a process that involved breaking of old (reactant) bonds and formation of new (product) bonds.
The process of bond breaking is endothermic (ΔH=positive), while the process of bond formation is exothermic (ΔH=negative).
Explain the difference between endothermic reactions and exothermic reactions with respect to the bond energies of the bonds broken and formed.
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