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C7: ENERGY CHANGES (Bond Energy Calculations (During a chemical reaction…
C7: ENERGY CHANGES
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Reaction Profiles
Chemical reactions can only occur when reacting particles collide with each other with sufficient energy
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Reaction profiles can be used to show the relative energies of the reactants/products, the activation energy and the overall energy change of a reaction
Bond making is exothermic, while bond breaking is endothermic
Bond Energy Calculations
During a chemical reaction energy must be supplied to break bonds in the reactants and energy is released when bonds in the products are formed
The energy needed to break bonds and the energy released when bonds are formed can be calculated from bond energies
The difference between the sum of the energy needed to break bonds in the reactants and the sum of the energy released when bonds in the products are formed is the overall energy change of the reaction
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
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