(Polar molecules, Non-polar molecules, etc.)
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Dissociation energy is the energy required to break a covalent bond. I believe that dissociation energy is positive because a positive change in energy is required to break a bond (gains energy) while a negative change in energy is required to make a bond (loses energy).
When bonds are formed, energy is released (negative) as atoms move toward a more stable state. The opposite, the breaking of bonds, would therefore require an input of energy (positive) in order to pull atoms away from that stable state.
Dissociation energy is always positive because it is the energy required to break a bond, therefore it would require an input of energy, which is always positive. However, to form a bond, energy would have to be released, resulting in a negative charge.
The dissociation energy is the energy required to break a bond. The greater the bond strength the greater the dissociation energy must be. This is a way to look at the dissociation E as a positive value. I think of it as going from weak (small value) to a strong (large value) bond. Weak -> big atomic radius, more LP repelling, -> little stronger -> more bonds, -> strongest -> ION-ION.
Dissociation energy is the energy required to break a bond. When bonds are formed, energy is released bc the molecule becomes more stable. When bonds are broken, energy must be added (positive) as to bring the atoms to less stable states (higher energy levels).
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