Enthalpy Definitions 0.0 / 5 ? ChemistryEnthalpyA2/A-levelOCR Created by: Rhiannon BushCreated on: 25-03-14 13:33 Enthalpy change of atomisation enthalpy change when 1mol of gaseous atoms forms from its elemement under standardstates and conditions 1 of 10 Enthalpy change of combustion enthalpy chnage when 1mol of a compound reacts completely in oxygen under standard states and conditions 2 of 10 Enthalpy change of formation Enthalpy change when 1mol of a compound is formed from its elements under standard states and conditions 3 of 10 Enthalpy change of hydration Enthalpy change when 1mol of isolated gaseous ions are dissolved in water, forming 1mol of aqueous ions under standard conditions 4 of 10 Enthalpy change of neutralisation Enthalpy change when an acid(aq) and a base(aq) neutralise each other forming 1mol of water under standard conditions 5 of 10 Enthalpy change of solution Enthalpy change when1mol of a compound is completely dissolved in water under standard conditions 6 of 10 Endothermic Takes in heat from the surrouindings. (+ve value) 7 of 10 Exothermic Releases heat into the surroundings. (-ve value) 8 of 10 Entropy the quantative measure of disorder within a system 9 of 10 Standard entropy change of reaction Entropy change that accompanies a reaction under standard states and conditions 10 of 10
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