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Internal energy sum of all kinetic and potential

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Internal energy: sum of all kinetic and potential energies of all the particles that compose a system. It is a state function: its value depends only on the state of the system, not at how the system arrived at that state Always the difference between its final and initial values If the reactants have a higher internal energy than the products, change in E is negative, and the energy flows to the surroundings If the reactants have a lower internal energy than the products, change in E is positive, and the energy flows into the system. The energy lost by the system is the exact amount gained by the surroundings. Heat: transfer of thermal energy -Always flows from matter at higher temp. to lower temp. Specific heat capacity: the amount of heat required to raise the temp. of 1 gram of a (J/g*C) substance by 1 degree C. Heat = mass * specific heat capacity *temperature change Pressure-volume work: occurs when the force is the result of a volume change against an external pressure.
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Enthalpy: the heat involved in a chemical reaction at constant pressure.
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