CHAPTER 15

CHAPTER 15 - Important Read Before Using Slides in Class...

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Important – Read Before Using Slides in Class Instructor: This PowerPoint presentation contains photos and figures from the text, as well as selected animations and videos. For animations and videos to run properly, we recommend that you run this PowerPoint presentation from the PowerLecture disc inserted in your computer. To run the animations on these slides please click on the icon on each still. If you prefer to customize the presentation or run it without the PowerLecture disc inserted, the animations and videos will only run properly if you also copy the associated animation and video files for each chapter onto your computer. Follow these steps: 1. Go to the disc drive directory containing the PowerLecture disc, and then to the “Media” folder, and then to the “PowerPoint_Lectures” folder. 2. In the “PowerPoint_Lectures” folder, copy the entire chapter folder to your computer. Chapter folders are named “chapter1”, “chapter2”, etc. Each chapter folder contains the PowerPoint Lecture file as well as the animation and video files. For assistance with copying the slide and video files, please visit our Technical Support at www.cengage.com/support or call (800) 423-0563. Thank you.
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2 15 Chemical Thermodynamics
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3 Chapter Goals Heat Changes and Thermochemistry 1. The First Law of Thermodynamics 2. Some Thermodynamic Terms 3. Enthalpy Changes 4. Calorimetry 5. Themochemical Equations 6. Standard States and Standard Enthalpy Changes 7. Standard Molar Enthalpies of Formation, H f o
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4 Chapter Goals 1. Hess’s Law 2. Bond Energies 3. Changes in Internal Energy, E 4. Relationship between H and E Spontaneity of Physical and Chemical Changes 1. The Two Aspects of Spontaneity 2. Dispersal of Energy and Matter 3. Entropy, S, and Entropy Change, S
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5 Chapter Goals Spontaneity of Physical and Chemical Changes 1. The Second Law of Thermodynamics 2. Free Energy Change, G, and Spontaneity 3. The Temperature Dependence of Spontaneity
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6 The First Law of Thermodynamics Thermodynamics is the study of the changes in energy and transfers of energy that accompany chemical and physical processes. In this chapter we will address 3 fundamental questions. 1. Will two (or more) substances react when they are mixed under specified conditions? 2. If they do react, what energy changes and transfers are associated with their reaction? 3. If a reaction occurs, to what extent does it occur?
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7 The First Law of Thermodynamics Exothermic reactions release energy in the form of heat. For example, the combustion of propane is exothermic. The combustion of n-butane is also exothermic. kJ 10 2.22 O 4H CO 3 O 5 H C 3 ) ( 2 2(g) 2(g) (g) 8 3 × + + + kJ 10 5.78 O H 10 CO 8 O 13 H C 2 3 ) ( 2 2(g) 2(g) 10(g) 4 × + + +
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The First Law of Thermodynamics Exothermic reactions generate specific amounts of heat. This is because
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This note was uploaded on 07/18/2011 for the course CHEM 1211 taught by Professor Atwood during the Spring '07 term at UGA.

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CHAPTER 15 - Important Read Before Using Slides in Class...

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