Chemistry

Difference Between Bond Energy and Bond Dissociation Energy

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Main Difference

The main difference between Bond Energy and Bond Dissociation Energy is that Bond Energy referred an average quantity of energy that is required to collapse all bonds among the two atoms present in a compound, whereas Bond Dissociation Energy is the average quantity of energy that is required to collapse a homolysis specific bond.

Bond Energy vs. Bond Dissociation Energy

Bond Energy is a term used for describing the average amount of energy that is required to break down all connected bonds between the two atoms that are present in a compound. However, Bond Dissociation Energy, on the other hand, is the average amount of energy that is required to break only a particular bond during homolysis.

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In Bond Energy, each bond between the two atoms will dissipate with different amounts of energy as compared to the other bonds in between these atoms. In contrast, in the case of Bond Dissociation Energy, the value of break down energy for each bond present between these two atoms remain the same when compared with each other.

Bond Energy gives the energy used at the start of the formation of a bond between these two atoms. In the case of Bond Dissociation Energy, it is the energy required to produce free radicals from the atoms used in the formation of that bond. In the case of Bond Energy, the bonds can break in any manner, i.e., symmetrically or asymmetrically, thus known as Heterolytic dissociation, but for Bond Dissociation Energy, the bond breaks only in a symmetrical way thus known as hemolytic dissociation.

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Bond Energy is the average value for the dissociation energy of all bonds of a certain type within a molecule; however, Bond Dissociation Energy is equal to the energy required for diatomic molecules because of being dissociation energy of a single chemical bond. In case of Bond Energy, it is not possible for determining the weaker or stronger bonds in a molecule as it is an average energy value for dissociation of all bonds, but in case of Bond Dissociation Energy, it is possible to determine strongest and weakest bonds in an atom as it is the energy associated with a single bond.

Comparison Chart

Bond EnergyBond Dissociation Energy
The average amount of energy that is required to break down all connected bonds between the two atoms in a molecule is known as bond energy.The average amount of energy that is required to break only a particular bond during hemolysis is known as bond dissociation energy.
Product
The energy used in the start for the formation of a bondThe energy that used to form free radicals from the atoms used in the formation of that bond
Value
Value of each bond varies from one bond to anotherValue of each bond is the same for other bonds
Bonds Involved
All bonds between two atomsThe single bond between two atoms
Identification of Strength of Bonds
Not possiblePossible for determining the weaker and stronger bonds.
Breaking of Bonds
A bond break can be symmetrically or asymmetricallyOnly symmetrical breaking of bonds
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What is Bond Energy?

Bond Energy used for describing the average amount of energy that is required to break down all connected bonds between the two atoms that are present in a compound. Here each bond between the two atoms will dissipate with different amounts of energy as compared to the other bonds in between these atoms and as it involves the breaking of all bonds simultaneously; thus, bonds breaking can take place in any manner like symmetrically or asymmetrically. That is why it is known as Heterolytic dissociation.

Bond Energy gives the energy which was used at the start for the formation of a bond between these two atoms. Thus the average value for the dissociation energy of all bonds of a certain type within a molecule is not the same and varies for each bond.

It is not possible for determining the weaker or stronger bonds in a molecule as it is an average energy value for dissociation of all bonds. For example, in the case of the removal of hydrogen atoms from a methane molecule, each bond dissociation energy for each hydrogen atom varies with other in the methane molecule.

What is Bond Dissociation Energy?

Bond Dissociation Energy considered as the quantity of energy that is required to collapse or break only a specific bond during homolysis. In this scenario, this breaking is known as hemolytic as the bond breaks only in a symmetrical way. Each bond between the two atoms will dissipate the same value of break down energy for each bond present between these two atoms when compared with each other.

In the case of Bond Dissociation Energy, it needed to shape atoms free-radicals which used in the formation of that bond. Thus the Bond Dissociation Energy is equal to the energy required for diatomic molecules because of being dissociation energy of a single chemical bond. In this case, it is possible to determine the strongest and weakest bonds in an atom as it is the energy associated with a single bond.

In the same example of methane, as discussed above, the dissociation energy for each diatomic molecule remains the same for each bond. Yet, the bond energy for each hydrogen atom varies. In another example of the water molecule, the bond dissociation form proton and hydroxyl group by homolysis cleavage.

Key Differences

  1. Bond Energy used for describing the average amount of energy required for tearing down all connected bonds between the two atoms, on the flip side, Bond Dissociation Energy is the average amount of energy that is required to break only a particular bond during homolysis.
  2. Bond Energy involves each bond between the two atoms that will dissipate the different amount of energy as compared to the other bonds, on the other hand, Bond Dissociation Energy involves the same value of break down energy for each bond present between these two atoms when compared with each other.
  3. Bond Energy involves the energy that used in the start for the formation of a bond between these two atoms; however, Bond Dissociation Energy involves energy required to form free radicals from the atoms which used in the formation of that bond.
  4. Bond Energy involves the breaking of the bond, which can take place symmetrically or asymmetrically; thus, their breakage is known as Heterolytic dissociation. Bond Dissociation Energy involves the breaking of bond symmetrically; thus, the breaking of these bonds is known as hemolytic dissociation.
  5. Bond Energy is the average value for the energy dissociation of all bonds of that certain type within a molecule; on the contrary, Bond Dissociation Energy is equal to the energy required for diatomic molecules.
  6. Determination of weaker or stronger bonds in a molecule is not possible in the case of Bond Energy, but in the case of Bond Dissociation Energy, it is possible to determine the strongest and weakest bonds in an atom.

Conclusion

Bond Energy is the amount of energy that is required to break down all bonds in the Heterolytic manner between the two atoms in a compound, but Bond Dissociation Energy is the amount of energy that is required to break a particular bond that takes place in a hemolytic manner.

Harlon Moss

Harlon currently works as a quality moderator and content writer for Difference Wiki. He graduated from the University of California in 2010 with a degree in Computer Science. Follow him on Twitter @HarlonMoss

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