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Unformatted text preview: 1 Chapter 4 Part 2: Entropy and Calculations with Energy Previously • Energy types • Energy conversions • Temperature Scales • Rules of Energy • Endo/Exothermic Terms • The sample decreased in energy as it burned in oxygen. The sample is known as the system . • It gave its energy to the surroundings . • The bomb calorimeter, since it contained the entire reaction, is referred to as the universe . Bomb Calorimetry • Combustion reaction in container • Water surrounds reaction – Absorbs heat – Detect temperature change – Back-calculate 2 Observation • We observe that a large piece of ice takes longer to melt than a small piece. • We observe that some substances cool faster than others (apple pie vs. aluminum foil) • One difference: Specific heat Specific Heat • Examples Potential Energy • Form of energy related to the positions of atoms and molecular structure • Stored in chemical bonds • Different bonds have different potential energy associated with them...
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This note was uploaded on 05/10/2008 for the course CH 304k taught by Professor Walker during the Spring '08 term at University of Texas at Austin.
- Spring '08