4.5.1.3 - The energy change of reactions
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5 Terms
what occurs during chemical reactions (referring to bonds)
energy must be supplied to break bonds in reactants
energy is released when bonds in the products are formed
In an exothermic reaction..
… the energy released from forming new bonds is greater than the energy needed to break existing bonds
In an endothermic reaction…
… the energy needed to break existing bonds is greater than the energy released from forming new bonds
what can you calculate from bond energies?
The energy needed to break bonds and the energy released when bonds are formed
The overall energy change of the reaction is…
… the difference between the sum of energy needed to break bonds in the reactants and the sum of energy released when bonds in the products are formed