Bond energy is defined as the energy
Correct answer: A. released when a bond is formed between two gaseous atoms, or equally the energy needed to break it
- A. released when a bond is formed between two gaseous atoms, or equally the energy needed to break it
- B. needed to melt an ionic solid
- C. stored in the nucleus
- D. needed to ionise an atom
Explanation
Breaking a bond is endothermic and forming the same bond is exothermic by exactly the same amount, so bond energy can be quoted either way provided the sign is handled consistently. Values in data books are averages taken across many compounds. Comparing the totals for bonds broken and bonds formed estimates the enthalpy change of a reaction.
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About Bond Energy
Bond energy is the energy needed to break one mole of a particular covalent bond in gaseous molecules, while bond formation releases energy. Reaction enthalpy is estimated by subtracting the total energy of bonds formed from bonds broken, with attention to average bond energies and their limitations for specific molecules.
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