Entropy 0.0 / 5 ? ChemistryEntropyA2/A-levelAQA Created by: StefaneiCreated on: 15-02-17 10:07 What is Entropy? The degree of disorder in a system 1 of 12 What are the units for entropy? Jmol-1K-1 2 of 12 When does entropy increase? solid becomes liquid, liquid becomes gas, temperature rises even if no change of state , solid dissolves or produces more particles 3 of 12 What is the equation for entropy change entropy change= sum of entropy of products- sum of entropy of reactants 4 of 12 What does a positive entropy chnage mean the products have more entropy compared with reactants and is always feasible 5 of 12 What does negative entropy change mean products have less entropy compared with reactants and only feasible if exothermic 6 of 12 Equation for gibbs free energy change gibbs free= enthalpy change - T x entropy change 7 of 12 How can a reaction be feasible Gibbs free change must be negative or zero 8 of 12 What if H is negative and S is positive G is always negative and feasible at any temperature 9 of 12 What if H is positive and S is negative G is always positive and not feasible at any temperature 10 of 12 What if H is positive and S is positive G is maybe + or - and feasible above certain temperature 11 of 12 What if H is negative and S is negative G is maybe + or - and feasible below certain temperature 12 of 12
Comments
No comments have yet been made