Which of the following correctly describes changes in energy during a chemical reaction?
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Due to the absorption of energy when chemical bonds are broken, and the release of energy when chemical bonds are formed, chemical reactions almost always involve a change in energy between products and reactants.
By the Law of Conservation of Energy, we know that the total energy of a system must remain unchanged, and that oftentimes a chemical reaction will absorb or release energy in the form of heat, light, or both.
The energy change in a chemical reaction is due to the difference in the amounts of stored chemical energy between the products and the reactants.
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