151Guo11Blch5Part1 - 9/29/2009 Energy The ability to do...

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9/29/2009 1 Chapter 5 Thermochemistry Thermochemistry Energy • The ability to do work or transfer heat. Work: Energy used to cause an object that has mass to move. Thermochemistry Heat: Energy used to cause the temperature of an object to rise. Potential Energy Energy an object possesses by virtue of its position or chemical composition. Thermochemistry Kinetic Energy Energy an object possesses by virtue of its motion. 1 KE = mv 2 Thermochemistry 2 Units of Energy • The SI unit of energy is the joule (J) . 1 J = 1  kg m 2 2 Thermochemistry • An older, non-SI unit is still in widespread use: The calorie (cal) . 1 cal = 4.184 J s System and Surroundings • The system includes the molecules we want to study (here, the Thermochemistry hydrogen and oxygen molecules). • The surroundings are everything else (here, the cylinder and piston).
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9/29/2009 2 system surroundings system has energy transfer has mass transfer Open System Thermochemistry surroundings no energy transfer no mass transfer Isolated System surroundings system has energy transfer no mass transfer Closed System - The capability to do work. - Kinetic vs. Potential Energy - Two Ways of Energy Transfer Work : E transfered when an object is moved Thermochemistry Heat by a force. W = F•d : E
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This note was uploaded on 10/16/2011 for the course CHM 151 taught by Professor Yiguo during the Fall '09 term at Chandler-Gilbert Community College.

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151Guo11Blch5Part1 - 9/29/2009 Energy The ability to do...

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