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15_Chapt5 - Thermochemistry Thermochemistry Study of energy...

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Thermochemistry Thermochemistry: Study of energy changes in chemical processes Energy 2H 2 + O 2 2H 2 O + energy H for chemical reactions kinetic potential First Law of Calorimetry, Heat Capacity Hess’s Law First Law of Thermodynamics E = q + w Heat of formation H f Standard State H f Enthalpy H Thermochemical Equations Foods and Fuels Mary J. Bojan Chem 110 1
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First Law of Thermodynamics Law of conservation of energy Energy can be converted from one form to another… …but total energy remains constant. Mary J. Bojan 2 Chem 110
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Energy Kinetic Energy energy of motion Mechanical moving mass (1/2m v 2 ) Electrical moving charge Light photons Sound molecules moving uniformly Heat molecules moving randomly Potential Energy stored energy Potential Energy Mechanical mass in a place where a force can act Chemical bonds Nuclear binding energy Mary J. Bojan Chem 110 3
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Energy Electronic Energy The potential energy associated with the electrons in The potential energy associated with the electrons in atoms and molecules Ch i l Chemical energy the Potential Energy associated with bonding H H + H H + O=O + 3 bonds 4 bonds O H H O H H Mary J. Bojan Chem 110 4
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Changes in Energy E = internal energy: total energy (E) associated with a system; the sum of all sources of kinetic & potential energy. the capacity to do work or transfer heat . E =E final E initial = q + w w = work= action of force through a distance (often P V) work done to the system (+) done to the system ( ) q = heat (thermal energy) = energy transferred due to a difference in temperature due to a difference in temperature. heat added to the system (+) Mary J. Bojan Chem 110 5
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