IMG_0001_NEW_0012

# IMG_0001_NEW_0012 - BUT does not tell us why changes...

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TODAY'S LECTURE,: "Spontaneity, Entropy and Free Energy" (Chapter 10) . Spontaneity, Disorder and Probability . Statistical Definition of Entropy a Spontaneity Spontaneous Process : occurs without outside intervention i.e., occurs naturally Processes in nature have a nafural direction But what determines that direction? Importance of enthalpy change (II): Exothermic reactions are usually spontaneous BUT Some Endothermic reactions are also spontaneous (e.g. melting of ice at room temperature) From observation: Spontaneous processes occur when there is in increase in randomness or "disorder" : ENTROPY (.9) 7 i.' Spontaneity, Entropy, and Energy . First Law of Thermodynamics : LE:q+w . Energy is conserved: "Energy bookkeeping'' Determines which processes r.r'il1
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