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6 - Thermochemistry Lecture No Calorimetry

6 - Thermochemistry Lecture No Calorimetry -...

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1 Thermochemistry Chapter 6 Zumdahl, 8 th edition
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2 Energy Lights our cities Powers our vehicles, planes and rockets Warms our homes Cooks our food Plays our music
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3 Energy "the ability to do work." Energy is conserved Energy of the universe is constant
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4 Energy Potential Due to position or composition Kinetic Due to motion of an object Pencil example
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5 Potential vs. Kinetic Energy Ball on ground Tossed in air Rises to maximum Falls to ground Ball lands on ground
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6 Definitions Heat: transfer of thermal energy between two bodies at different temps. Thermochemistry: study of heat changes in chemical reactions Work: force acting over a distance Picking up pencil and putting it on desk
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7 Unit of Energy Joule (J) Fundamental SI unit of energy J = kg · m 2 s 2
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8 Chemical Energy SYSTEM: specific part of the universe that is of interest to us. SURROUNDINGS: the rest of the universe outside the system
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9 Energy Internal Energy of a system Sum of the kinetic and potential energies E = q + w q = heat w = work
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10 Work vs. Energy Flow
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11 Calculating Internal Energy Calculate E for a system undergoing an exothermic process in which 20.7 kJ of heat flows and where 0.75 kJ of work is done on the system.
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Calculating Internal Energy Calculate E for a system undergoing an exothermic process in which 20.7 kJ of heat flows and where 0.75 kJ of work is done on the system. E
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