What you’ll learn3 learning objectivesChoose one objective for a focused lesson, or study the complete topic.23.3.1Terms: entropy, S, as the number of possible• Define: entropy, S, as the number of possible arrangements of the particles and their energy in a given systemSyllabus objective23.3.2Predict/explain the sign of the entropy• Predict/explain: the sign of the entropy changes that occur:- (a) during a change in state, e.g. melting, boiling and dissolving (and their reverse)- (b) during a temperature change- (c) during a reaction in which there is a change in the number of gaseous moleculesSyllabus objective23.3.3The entropy change for a reaction, ΔS• Calculate the entropy change for a reaction, ΔS, given the standard entropies, S ⦵ , of the reactants and products, ΔS ⦵ = ΣS ⦵: (products) – ΣS ⦵ (reactants) (use of ΔS ⦵ = ΔSsurr + ΔSsys is not required)Syllabus objective