5.2.2 Enthalpy and Entropy
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Define entropy
A measure of the dispersal of energy in a system which is greater when the system is more disordered
What is the symbol of entropy
S
Solid or gas, which is more disordered
gas
What is the unit of standard entropy
J K-1 mol -1
How does temperature affect entropy?
The greater temperature particles have more energy and move more. Thus the arrangement of particles become more random. more random arrangement = higher entropy
When a solid ionic lattice is dissolved in solution, what happens to entropy
Entropy increases because the ions are more disordered
How does change in number of gas molecules in a reaction affect entropy?
Increase in no. gas molecules = increase in entropy Decrease in no. gas molecules = decrease in entropy
Write the equation used to calculate entropy change
Entropy change = S products - S reactants
Write the Gibbs free energy equation and state what each symbol means?
Delta G = Delta H - T Detla S
For a reaction to occur spontaneously (feasible) , Delta G must be positive or negative?
Negative
What are the limitations of the predictions of feasibility made by using delta G?
Reaction ay have high activation energy Rate of reaction may be very slow