8 - Thermochemistry Chapter 5 Thermochemistry March 3, 2008...

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Unformatted text preview: Thermochemistry Chapter 5 Thermochemistry March 3, 2008 Lecture Alexander Shekhtman Thermochemistry Energy The ability to do work or transfer heat. Work: Energy used to cause an object that has mass to move. Heat: Energy used to cause the temperature of an object to rise. Thermochemistry 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 2 KE = mv 2 Thermochemistry Units of Energy The SI unit of energy is the joule (J) . An older, non-SI unit is still in widespread use: The calorie (cal) . 1 cal = 4.184 J 1 J = 1 kg m s Thermochemistry System and Surroundings The system includes the molecules that we want to study (i.e., the H 2 and O 2 molecules). The surroundings are everything else (i.e., the cylinder and piston). Thermochemistry Work Energy used to move an object over some distance. w = F d where w is work, F is the force, and d is the distance over which the force is exerted. Thermochemistry Heat Energy can also be transferred as heat. Heat flows from warmer objects to cooler objects. Thermochemistry Transferal of Energy a) The potential energy of this ball of clay is increased when it is moved from the ground to the top of the wall. Thermochemistry Transferal of Energy a) The potential energy of this ball of clay is increased when it is moved from the ground to the top of the wall....
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This note was uploaded on 01/18/2009 for the course CHM 120 taught by Professor Pande during the Spring '08 term at SUNY Albany.

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8 - Thermochemistry Chapter 5 Thermochemistry March 3, 2008...

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