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Unformatted text preview: However, this is a relatively small effect (suggesting that bonding electrons are localized between the bonding atoms). Thus, the bond energy for most bonds varies little from the average bonding energy for that type of bond Bond energy is always a positive value - it takes energy to break a covalent bond (conversely energy is released during bond formation) Average bond energies: Bond (kJ/mol) C-F 485 C-Cl 328 C-Br 276 C-I 240 C-C 348 C-N 293 C-O 358 C-F 485 C-C 348 C=C 614 C= C 839 The more stable a molecule (i.e. the stronger the bonds) the less likely the molecule is to undergo a chemical reaction...
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