Week 24 Explain that entropy is a measure of the disorder of a system, and that a system becomes energetically more stable when it becomes more disordered. Explain: the difference in entropy of a solid and a gas; the change when a solid lattice dissolves; the change in a reaction in which there is a change in the number of gaseous molecules. Calculate the entropy change for a reaction given the entropies of reactants and products. © Pearson Education Ltd 2009 This document may have been altered from the original

Week 24 Increasing entropy © Pearson Education Ltd 2009 This document may have been altered from the original

State and use the relationship ∆G = ∆H – T∆S. Week 24 Explain that the tendency of a process to take place depends on temperature, T, the entropy change in the system, ∆S, and the enthalpy change, ∆H, with the surroundings. Explain that the balance between entropy and enthalpy change is the free energy change, ∆G. State and use the relationship ∆G = ∆H – T∆S. Explain how endothermic reactions are able to take place spontaneously. © Pearson Education Ltd 2009 This document may have been altered from the original