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The First Law of Thermodynamics, also known as the Law of Energy Conservation, states that energy cannot be created or destroyed, only transformed from one form to another. In the context of reacting systems, this principle plays a critical role in understanding how energy flows and changes during chemical reactions. In any chemical reaction, whether it is exothermic (releasing energy) or endothermic (absorbing energy), the total energy of the system must remain constant. The energy involved in the reaction is typically in the form of heat and work, and both are linked to the internal energy of the system. Internal energy includes the energy associated with _____ ___ _____ ______ ___ ___ __________ _______ _________ _____.
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