1 Chapter 5- Thermochemistry 5.1 Thermochemistry • Thermodynamics: – • Thermochemistry: – – 5.2 Spontaneity and Thermodynamics • Spontaneityrefers • Spontaneous process happen under specific conditions • Non-spontaneous happen under specific conditions • Spontaneity implies • Spontaneous in one direction means in the reverse direction5.3 Spontanetiy and Temparature •Processes that are spontaneous under one set of conditions, including temperature, may be non-spontaneous under other conditions. 5.4 Energy at the Molecular Level • Kinetic energy : – KE = – Temperature • Potential energy: – For chemistry we care about electrostatic attractions (oppositely charge particles): Coulomb potential: ܧן5.5 Energy is a state function • Depends only on the difference between initial and final state of the system. – Independent of path between states.
2 Chapter 5- Thermochemistry 5.6 Phase Changes and Heat Flow 5.6 1st Law of thermodynamics • Law of Conservation of Energy: •
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- Fall '08