Chap5A - Chem 130 WANG Chapter 5A Chapter 5.1 to 5.4...

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Chem 130/ WANG / Chapter 5A Fall 2007 UM-SJTU JI 1 Chapter 5.1 to 5.4 Thermochemistry (A) Nature of Energy First Law of Thermodynamics Enthalpy Enthalpy of Reaction Thermochemistry square6 Thermodynamics Thermodynamics – square6 Thermo = heat square6 Dynamics = in motion square6 Thermochemistry Thermochemistry – square6 The science of heat transfer through chemical reactions. frequently used terms in thermochemistry square6 System square6 well-defined part of the universe square6 Surroundings square6 Everything else System + surroundings = The The Uiverse Uiverse Everything included!! frequently used terms in thermochemistry square6 State function square6 A property of the system square6 Independent of the path it took to come to the “current state.” square6 Function only of the “current state” square6 Examples: State function System final initial Presure: P = P - P Δ final initial Volume: V = V - V Δ final initial Temperature: = T - T T Δ frequently used terms in thermochemistry square6 Closed system square6 No mass exchange with surroundings. square6 Such as a sealed reaction vessel surroundings Closed System mass exchange: No energy exchange: O.K. Mass & energy Exchange: Energy only Nothing Practical Examples Open Closed Isolated
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Chem 130/ WANG / Chapter 5A Fall 2007 UM-SJTU JI 2 frequently used terms in thermochemistry square6 Energy square6 Capacity to do WORK or transfer HEAT square6 Potential Energy (PE) square6 energy “stored “ square6 based on static position and force square6 Between “masses” = gravitational PE square6 Between“charges” = electrostatic PE square6 No motion involved frequently used terms in thermochemistry square6 Chemical Energy square6 A form of Potential Energy (PE) square6 Mostly based on “charge” interactions between / among electrons & nucleus. frequently used terms in thermochemistry square6 Kinetic Energy (KE) square6 Energy involved in motion square6 Work (w) square6 motion of an object against an opposing force square6 HEAT (q) square6 random molecular motions square6 Also called “thermal energy” frequently used terms in thermochemistry
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