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8 Cards in this Set
- Front
- Back
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Entropy |
Low energy states are more stable than high energy states |
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Entropy |
Measure of randomness or disorder S If ∆S is negative, entropy is lost ( products are more orderly than the reactants) Symbolised by SIf ∆S is negative, entropy is lost ( products are more orderly than the reactants)If ∆S is positive, entropy is gained(Reactants are more orderly than the products) If ∆S is positive, entropy is gained (Reactants are more orderly than the products) |
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Enthalpy |
Energy states of reactants and products Symbolised by H Universe prefers -∆H(low enthalpy) +∆H is endothermic , absorbs energy -∆H is exothermic, releases energy |
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Heat of formation |
Amount of heat that is released or absorbed when 1 mole of a compound is formed from its elements Symbolised by ∆Hf All elements such as C,Ni,N2,O2 heat of formation is zero |
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Total Hf |
Hf ( products) - Hf ( reactants) |
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Hess's law |
∆H of the reaction will be the sum of individual steps |
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Spontaneous reaction |
No input of energy |
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Gibbs energy |
∆G=∆H-T∆S T in K -∆G means spontaneity in forward direction +∆G means spontaneity in reverse direction ∆G=0 means reaction is in equilibrium |
