Lecture 1 - Welcome to Chemistry 215! H. Floyd Davis...

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1 Chapter 9: Thermochemistry Lab Starts Next Week Read Chapter 9.1-9.2 Looking Ahead: Chapter 9.3-9.6 Welcome to Chemistry 215 ! H. Floyd Davis
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2 OPEN: exchanges both matter and energy with surroundings System Classification OPEN
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3 CLOSED exchanges only energy with surroundings System Classification OPEN CLOSED
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4 ISOLATED exchanges nothing with surroundings System Classification OPEN CLOSED ISOLATED
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5 The Nature of Energy • Energy, E: – Capacity to do work or produce heat. Kinetic energy, potential energy, nuclear energy…. Law of Conservation of Energy (1 st Law of Thermo): Energy can be converted from one form to another, but can be neither created nor destroyed The energy of the universe (system + surroundings) is constant. Work, w: Heat, q: done when a force acts through a distance . involves transfer of E due to temp. difference.
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6 Exothermic vs. Endothermic Reactions Exothermic (exo = out) In a non isolated system, releases heat to surroundings. Produces a temperature increase in an isolated system
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Lecture 1 - Welcome to Chemistry 215! H. Floyd Davis...

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