Entropy 2

Entropy 2 - SCH4U1 The Factors Affecting Equilibrium The...

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SCH4U1 The Factors Affecting Equilibrium The composition of the equilibrium state (i.e. the proportion of reactants and products) is determined by: 1) The Tendency Towards Minimum Potential Energy (Enthalpy or H ) H = H products - H reactants H < 0: The forward reaction is exothermic and favoured. H > 0: The forward reaction is endothermic and the reverse reaction is favoured. Most reactions we study are exothermic because these tend to be spontaneous. 2) The Tendency Towards Maximum Randomness (Entropy or S ) S = S products - S reactants S > 0: Products are more random and the forward reaction is favoured. S < 0: Products are less random and the reverse reaction is favoured. Reactions favour the direction that produces maximum randomness. At low temperatures, enthalpy change has the greatest influence and exothermic reactions are generally spontaneous.
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At high temperatures, the random motion of molecules is increased and the entropy factor ( S ) has more influence on the equilibrium state.
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This note was uploaded on 07/06/2011 for the course SCH 4U taught by Professor White during the Spring '10 term at Beacon FL.

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Entropy 2 - SCH4U1 The Factors Affecting Equilibrium The...

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