A2 OCR Chemistry: Entropy and Free Energy

A concise one page revision sheet for entropy and free energy

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Emily Summers
Entropy/S: The quantitative measure of the degree of disorder in a system.
Entropy increases when:
Number of gaseous molecules increase
Solid Liquid Gas
Solid lattice dissolves
Calculating Entropy:
S = S° (products) - S°(reactants)
Free Energy
G = H - T S
For the reaction to be feasible, G < 0
H S G Feasibility
-ve +ve Always ­ve Feasible
+ve -ve Always +ve Never feasible
-ve -ve -ve at low temp. Feasible at low temp
+ve +ve -ve at high temp. Feasible at high temp


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