Ch_06_a - Basic Terms Chapter 6 Thermochemistry energy...

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1 Chapter 6 Thermochemistry 10/23/2007 2 Basic Terms energy • system and surroundings •heat( q ) and work ( w ) • state function • internal energy • first law of thermodynamics 3 Energy Energy refers to the capacity to do work – that is, to move or displace matter Two basic types of energy: Potential energy (possibility of doing work because of composition or position) Kinetic energy (moving objects doing work) 4 Potential Energy – in a gravitational field (due to position) Kinetic Energy – energy of motion PE = mgh m = mass (kg) g = gravity constant (m s –2 ) h = height (m) KE = ½ m v 2 m = mass (kg) v = velocity (m s –1 ) v 2 = (m 2 s –2 ) units are kg m 2 s –2 Joule (J) units are kg m 2 s –2 J Energy
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5 Work Work is the product of the force in the direction of motion and the distance the object is moved. Work = force × distance Î energy (J) Collisions in the real world are not perfectly elastic Energy transfer occurs as a result of inelastic collisions 6 Thermochemistry Thermochemistry is the study of energy changes that occur during chemical reactions and physical processes. Universe Focus is on energy and matter exchange between the system and the surroundings System Surroundings Surroundings 7 Types of systems one can study: OPEN Matter Matter Energy Energy CLOSED Matter Energy Energy Matter ISOLATED Matter Matter Energy Energy
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This note was uploaded on 05/06/2008 for the course CHEM 103 taught by Professor Forgot during the Spring '07 term at CUNY City.

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Ch_06_a - Basic Terms Chapter 6 Thermochemistry energy...

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