- in chemical reactions, energy must be supplied to break the bonds between atoms in the 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 absorbed when bonds are broken
- in an endothermic reaction, the energy released when new bonds are formed is less than the energy absorbed when bonds are broken
- can calculate the overall energy change in a chemical reaction using bond energies
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