ln19f07 - LECTURE 19 GETTING READY FOR THERMODYNAMICS In...

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L ECTURE 19. G ETTING READY FOR T HERMODYNAMICS In class you learned that this reaction happens… 2 H 2 + O 2 Æ 2 H 2 O … a big H 2 balloon explosion!!!! You learned how to draw the structures; you learned that there were products and reactants that balanced stoichimetrically because of conservation of mass and change. You also got to see an explosion because this is the reaction of a hydrogen balloon. In understanding the stoichimetry, we paid no attention to the explosion and heat given off. We just counted up stuff to make sure mass and charge were conserved. But now we are learning about thermodynamics , and will be needing to account for all the energy change that occurs. Sure we want to conserve matter, but we want an accounting of all that energy in the reaction. ***Thermodynamics is the study of the energy change in a system--whether it is energy in the form of heat as with the exploding balloon, or mechanical work, or creating order in a system.***
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So why is there energy change in a chemical reaction? Simply, it is because of bonds breaking and bonds forming.
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This note was uploaded on 05/21/2008 for the course CH 301 taught by Professor Fakhreddine/lyon during the Spring '07 term at University of Texas.

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ln19f07 - LECTURE 19 GETTING READY FOR THERMODYNAMICS In...

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