Lecture 5 - 1 The Hindenburg dirigible was filled with H 2...

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9/19/2016 1 The Hindenburg dirigible was filled with H 2 gas Life Sciences 1a Fall 2016 Dan Kahne Chemical Kinetics H 2 gas can react with O 2 gas to form H 2 O G ˚ rxn << 0 Why did anyone in their right mind fly on this aircraft? 1. What happens as molecules react 2. Why some reactions are fast while others are slow Lectures 5 & 6: The Chemical Foundations of Life III Although the reaction of H 2 with O 2 gas is very favorable ( G ° rxn << 0), the rate of this reaction is VERY SLOW (many people did fly on the Hindenburg without problems)
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9/19/2016 2 Objectives: You should be able to… •Use arrow pushing formalism to represent a molecular mechanism for a given reaction. •Draw the products and transition state associated with a molecular mechanism for a given reaction. •Write a rate expression for a chemical reaction and explain how the rate is affected when changes are made to the system. •Draw and interpret reaction energy diagrams. Goal: To understand the factors that influence the rate of a reaction. Life requires fast reactions: The rates of spontaneous reactions can vary by 15 orders of magnitude The flask The cell How does the cell speed up slow reactions?
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