lecture39_chem110_sas - Chemical Reactions: Thermochemistry...

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Chemical Reactions: Thermochemistry Part 2 CH110 FA11 SAS 1 Prepare for Recitation December 1 st ALEKS Objective 13 due November 29 th ANGEL Quiz 13, December 1 st Lecture 37: November 16 th Lecture 38: November 18 th (Thanksgiving Break) Lecture 39: November 28 th Read: Ch. 4.6,10.5 (Reactions); 5.3 – 5.7, 8.8 (Thermo) Additional Preparation: Packet Rxns : 12-18 BLB 10: 57 BLB 5: 4,17,29,37,39, 53,55,83,85; Packet 5: 1-7 BLB 8: 65a,67ac,92a; 18: 72ab,74; Packet 8: 12-14
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CH110 FA11 SAS 2 By the end of Today’s Lecture you should know: Hess’s Law Thermodynamic cycles Standard enthalpy of reaction Bond energy KEY QUESTIONS: THE BIG PICTURE Chemical Reactions: Thermochemistry Part 2 What is Hess’s Law? How do I determine or predict the enthalpy of a reaction? How does the enthalpy of a reaction relate to the actual chemistry Remember: Energy is stored in molecules. What are the microscopic connections? How do thermodynamic cycles allow me to predict the outcome of unknown reactions? What is the relationship between bond length and bond strength?
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CH110 FA11 SAS 3 Reason: Bottom line of Hess’s Law: You do not need to measure H rxn for every reaction…use H f o for products and reactants (from tables) and calculate. Remember
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This note was uploaded on 01/18/2012 for the course CHEM 110 taught by Professor Hofmann,brucerob during the Fall '08 term at Pennsylvania State University, University Park.

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lecture39_chem110_sas - Chemical Reactions: Thermochemistry...

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