C7.4 bond energy calculations

Key Points

In chemical reactions, energy must be supplied to break the bonds between atoms and reactants
When new bonds are formed between atoms in a chemical reaction, energy is released
in an exothermic reaction, the energy released when new bonds are formed is greater than the energy required to break them
in an endothermic reation, the energy released when new bonds are formed is less than the energy required to break them
you can calculate the overal energy change in a chemical reactions using bond energies

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Bond energy - the energy required to break a specific chemical bond

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