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[Music] hi and welcome back to precise lesson code UK by the end of the two pod video you should be able to use bond energies to calculate the energy change for a chemical reaction this can look quite tricky but Ill show you a method that always works weve seen that some reactions are exothermic remember that an exothermic reactions energy is transferred from the chemical to the surroundings this means that an exothermic reaction energy changes are shown as negative thats because energy has been transferred from the chemicals in endothermic reaction the chemicals gained energy from the surroundings so endothermic energy changes are shown as positive to show that energy being gained in this video were going to see how we can calculate energy changes and to do this we need to look at the idea of formed energy when we break a chemical bond this requires energy under the endothermic melting bond releases energy under there for exothermic every chemical bond has an energy value and thi