Thermodynamics 4.0 / 5 based on 1 rating ? ChemistryThermodynamicsA2/A-levelAQA Created by: EbissettCreated on: 18-01-18 13:36 What is the symbol for enthalpy change? Delta H 1 of 26 What is enthalpy change? The heat energy transferred in a reaction at constant pressure 2 of 26 What is an exothermic reaction? They have a negative delta H value - heat is given out 3 of 26 What is an endothermic reaction? They have a positive delta H value - heat is absorbed 4 of 26 What is enthalpy change of formation? The enthalpy change when 1 mole of a compound is formed from its elements in their standard states under standard conditions 5 of 26 What is bond dissociation enthalpy? The enthalpy change when all the bonds of the same type in 1 mole of gaseous molecules are broken 6 of 26 What is enthalpy change of atomisation of an element? The enthalpy change when 1 mole of gaseous atoms is formed from an element in its standard state 7 of 26 What is the enthalpy change of atomisation of a compound? The enthalpy change when 1 mole of a compound in its standard state is converted to gaseous atoms. 8 of 26 What is the enthalpy chnage of hydration? The enthalpy chnage when 1 mole of aqueous ions is formed from 1 mole of gaseous ions 9 of 26 What is the enthalpy change of solution? The enthalpy change when 1 mole of solute is dissolved in enough solvent that no further enthalpy change occurs on further dilution 10 of 26 What is lattice enthalpy? A measure of ionic bond strength 11 of 26 What 2 things happen when an ionic lattice dissolves in water? The bonds between the ions break to give free ions and bonds between the ions and the water are made 12 of 26 What are the 3 arrow labels when drawing out the enthalpy change of solution? Enthalpy change of solution, lattice dissociation enthalpy and enthalpy of hydration 13 of 26 What is entropy? The measure of the number of ways that particles can be arranged and the number of ways that the energy can be shared out between the particles 14 of 26 Which state has a higher entropy? Gas 15 of 26 What is the equation to work out entropy change? delta S = Sproducts - Sreactants 16 of 26 What does delta G have to be for a reaction to be feasible? Negative or 0 17 of 26 What is the free energy equation? Delta G = Delta H -T delta S 18 of 26 What do the parts of the free energy equation stand for? Delta H = Enthalpy change, T = temperature, Delta S = entropy change 19 of 26 How do you work out at which temperature a reaction is feasible? T = Delta H / Delta S 20 of 26 What is first ionisation energy? The enthalpy change when 1 mole of gaseous 1+ ions is formed from 1 mole of gaseous atoms 21 of 26 What is second ionisation energy? The enthalpy change when 1 mole of gaseous 2+ ions is formed from 1 mole of gaseous 1+ ions. 22 of 26 What is first electron affinity? The enthalpy change when 1 mole of gaseous 1- ions is formed from 1 mole of gaseous atoms. 23 of 26 What is second electron affinity? The enthalpy change when 1 mole of gaseous 2- ions is formed from one mole of gaseous 1- ions. 24 of 26 What is lattice enthalpy of formation? The enthalpy change when 1 mole of a solid ionic compound is formed from its gaseous ions under standard conditions 25 of 26 What is lattice enthalpy of dissociation? The enthalpy change when 1 mole of a solid ionic compound is completely dissociated into its gaseous ions under standard conditions. 26 of 26
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