IB Chemistry Topic 5 Energetics HL 15.2 Entropy and spontaneity

IB Chemistry Topic 5 Energetics HL 15.2 Entropy and spontaneity How to do entropy and Gibbs free energy calculations for HL For full resources for topic 5 see: http://www.mrwengibchemistry.com 0:11 Entropy 1:50 Entropy formula 3:01 Example problem entropy 3:37 Gibbs free energy 4:31 Summary of formula 5:15 Summary of trends and spontaneity 7:40 Example problem 1 Gibbs 8:16 Example problem 2 Gibbs 15.2 Entropy and spontaneity HL • Entropy (S) refers to the distribution of available energy among the particles. The more ways the energy can be distributed the higher the entropy. • Gibbs free energy (G) relates the energy that can be obtained from a chemical reaction to the change in enthalpy (ΔH), change in entropy (ΔS), and absolute temperature (T). • Entropy of gas greater than liquid greater than solid under same conditions. • Prediction of whether a change will result in an increase or decrease in entropy by considering the states of the reactants and products. • Calculation of entropy changes (ΔS) from given standard entropy values (Sº). • Application of ΔG° = ΔH° - TΔS° in predicting spontaneity and calculation of various conditions of enthalpy and temperature that will affect this. • Relation of ΔG to position of equilibrium. Connect with me: Facebook:   / ibchemistry2016