Chemistry — Bond Enthalpy
Enthalpy change from bonds broken and made.
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\Delta H = \sum E(\text{bonds broken}) - \sum E(\text{bonds made})
\Delta H < 0 \Rightarrow \text{exothermic}
\Delta H > 0 \Rightarrow \text{endothermic}
E_a = E(\text{transition state}) - E(\text{reactants})