chapter 6-6 slides per page - Topics The Nature of Energy...

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1 Topics • The Nature of Energy • State Functions: Internal Energy and Enthalpy • Enthalpies of Reactions • Thermochemical Equations • Calorimetry • Standard Enthalpies of Formation • Hess’s Law Thermodynamics: the study of the relationship between heat (thermo) and work (dynamics) Thermochemistry: the study of the relationships between chemical reactions and thermal energy changes. Important Concepts Energy: the capacity to do work or to transfer heat Work (w): the energy used to move an object work = force x displacement w = F x d force = mass x acceleration F = m x a Heat (q): the energy transferred from a hotter object to a colder one Important Concepts System : the object of our investigation Surroundings : the rest of the Universe Law of the Conservation of Energy: Energy may be converted from one form to another but the total quantities of energy remain constant Some Common Forms of Energy Kinetic : associated with motion Potential : associated with position in the gravitational, or electrical, or magnetic field, for example Internal , U: the sum of the kinetic and potential energies of the particles making up a substance 2 k mv 2 1 E = r q kq 2 1 el E = velocity V mass, m constant - k charges between distance r charges, q , q 2 1 Energy Units SI unit for energy is the joule, J: Traditional unit: 1 cal = 4.184 J (exactly) A nutritional Calorie: 1 Cal = 1000 cal = 1 kcal J 1 = 2 2 1 mv E k = 2 2 s m kg 1 =
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2 Heat Transfer Energy Transfer
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This note was uploaded on 05/04/2010 for the course CHEMISTRY 130 taught by Professor Jadwigasipowska during the Winter '10 term at University of Michigan.

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chapter 6-6 slides per page - Topics The Nature of Energy...

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