C103-sp10-0503 - Chemistry 103 Spring 2010 Today 1 More on entropy Announcements 1 Ch 16 OWL homework is active 2 Next midterm exam on May 17 or 19

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Chemistry 103 Spring 2010 Today 1. More on entropy. Announcements 1. Ch. 16 OWL homework is active. 2. Next midterm exam on May 17 or 19. 3. CSULA closure on May 21 (furlough). 4. CSULA closure on May 31 (holiday). 5. Bring textbook and calculator to each lecture.
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Chemistry 103 Spring 2010 2 Review entropy : a measure of the extent to which energy is dispersed throughout a system; a quantitative (numerical) measure of disorder at the nanoscale; given the symbol S. In brief, processes that increase entropy ( Δ S > 0) create more disorder and are favored, while processes that decrease entropy ( Δ S < 0) create more order and are not favored. Examples : 1. Things fall apart over time. (constant energy input is required to maintain things) 2. Spilling water from a glass vs. spilled water moving back into the glass. 3. Thermal energy disperses from hot objects to cold objects, not from cold to hot. 4. A gas will expand to fill its container, not concentrate itself in one part of the container.
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Chemistry 103 Spring 2010 3 Energy disperses (spreads out) over a larger number of particles. Ex : exothermic reaction, hot object losing thermal energy to cold object. Energy disperses over a larger space (volume)
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C103-sp10-0503 - Chemistry 103 Spring 2010 Today 1 More on entropy Announcements 1 Ch 16 OWL homework is active 2 Next midterm exam on May 17 or 19

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