CHEM_1017___ch.6 - Energy is the capacity to do work...

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Energy is the capacity to do work Radiant energy comes from the sun and is earth’s primary energy source Thermal energy is the energy associated with the random motion of atoms and molecules Chemical energy is the energy stored within the bonds of chemical substances Nuclear energy is the energy stored within the collection of neutrons and protons in the atom Potential energy is the energy available by virtue of an object’s position 6.1
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Thermochemistry is the study of heat change in chemical reactions. The system is the specific part of the universe that is of interest in the study. open Exchange: closed energy isolated nothing SYSTEM SURROUNDINGS 6.2
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Exothermic process is any process that gives off heat – transfers thermal energy from the system to the surroundings. Endothermic process is any process in which heat has to be supplied to the system from the surroundings. 2H 2 ( g ) + O 2 ( g ) 2H 2 O ( l ) + energy H 2 O ( g ) H 2 O ( l ) + energy energy + 2HgO ( s ) 2Hg ( l ) + O 2 ( g ) 6.2 energy + H 2 O ( s ) H 2 O ( l )
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Exothermic Endothermic 6.2
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Thermodynamics State functions are properties that are determined by the state of the system, regardless of how that condition was achieved. Potential energy of hiker 1 and hiker 2 is the same even though they took different paths. energy, pressure, volume, temperature 6.3 E = E final - E initial P = P final - P initial V = V final - V initial T = T final - T initial
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– energy can be converted from one form to another, but cannot be created or destroyed. E system + E surroundings = 0 or E system = - E surroundings C 3 H 8 + 5O 2 3CO 2 + 4H 2 by the surroundings system surroundings
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This note was uploaded on 10/13/2010 for the course CHEM 101 taught by Professor Crago during the Spring '06 term at Loyola New Orleans.

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CHEM_1017___ch.6 - Energy is the capacity to do work...

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