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Question

Why does making a bond release energy?


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Solution

Bond formation:

  • During the bond formation, when reactant atoms come closer to form chemical bonds, the energy is relased to minimize the repulsion between the atoms.
  • Since the system tends to release energy when a chemical bond is established, the enthalpy change in this scenario will be negative.
atoms - Hydrogen molecule potential energy graph - Chemistry Stack Exchange
  • In the potential energy curve during the formation of a chemical bond, the energy is negative at equilibrium distance which indicates that energy is released during the formation of a bond.

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