Bond Energy (HSC SSCE Chemistry): Flashcards

Energy needed to break a chemical bond

$B$ (e.g., $B_{ ext{C-H}}$, $B_{ ext{O-H}}$)

Enthalpy change to form gaseous atoms from element's std state

$\Delta H_{\text{at}}^{\circ}$

Higher bond energy = more stable, less reactive compound

The weakest bond in the molecule

$\Delta H^{\circ}$ = (bonds broken) - (bonds formed)

Requires energy (positive value)

Releases energy (negative value)

Not very accurate; bond energies are averages across compounds