Thermodynamics Quiz for unit 5 aqa chemistry A2 3.0 / 5 based on 3 ratings ? ChemistryEnthalpyA2/A-levelAQA Created by: Carla TromansCreated on: 16-12-12 18:39 What is enthalpy of formation? Enthalpy change when one mole of a compound is formed from its elements. Compound and elements in standard states. 1 of 15 What state are ions in for 1st ionisation enthalpy? Gaseous 2 of 15 What is bond dissociation enthalpy? Enthalpy change when one mold of gaseous covalent bonds is broken homolytically, forming free radicals 3 of 15 What is: 'the enthalpy change when one mole of free gaseous ions is added to an excess of water'? Enthalpy of hydration 4 of 15 What is bond breaking? Endothermic 5 of 15 Why is second electron affinity endothermic? Repulsion between oppositely charged ions must be overcome 6 of 15 How can you calculate enthalpy of solution? enthalpy of lattice dissociation + (sum of hydration enthalpies) 7 of 15 How can you calculate enthalpy change of a reaction? (sum of bonds broken) - (sum of bonds formed) 8 of 15 When is a lattice soluble? When enthalpy of solution is exothermic 9 of 15 What is a spontaneous reaction? A process that will proceed without any external influence 10 of 15 What is entropy? A measure of the ways in which particles can be rearranged, and energy measured. 11 of 15 How do you calculate entropy? (sum of entropy of products) - (sum of entropy of reactants) 12 of 15 What is the unit of entropy? JK-1mol-1 13 of 15 How do you calculate gibbs free energy? enthalpy change - (T*entropy change) 14 of 15 When is a reaction spontaneous? When GFE is less than or equal to 0 15 of 15
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