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L27-post-rev - Lecture 27 What a Mess Energy Dispersal Key...

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1 Lecture 27 What a Mess: Energy Dispersal Key Idea: There is a natural tendency for energy to disperse. * What is the direction of the physical or chemical process occuring? * Can you imagine them occurring spontaneously in the opposite direction? Natural direction of chemical and physical processes Why do these processes all happen in one particular direction? Why do these processes all happen in one particular direction? * Br 2 expansion into vacuum * CaCl 2 dissolution: CaCl 2 (s) + H 2 O (l) Ca 2+ (aq) + 2 Cl (aq) * NH 4 Cl dissolution NH 4 Cl (s) + H 2 O (l) NH 4 + (aq) + Cl (aq) These processes are all “product-favored” as written! H rxn = 81 kJ/mol o H rxn = 0 o H rxn = + 15 kJ/mol o house of cards pile of cards There is a tendency for processes to happen in the direction of: • higher probability • greater disorder • greater randomness • higher dispersion of energy ENTROPY greater Which configuration of a system represents greater entropy, S?
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