Enthalpy change of a solution - The enthalpy change when one mole of an ionic substance dissolves in enough solvent to form an infinetely dilute solution, First ionisation energy - The enthalpy change when one mole of gaseous 1+ ions is formed from one mole of gaseous atoms when it loses one mole of electrons, Enthalpy change of hydration - Standard enthalpy change when one mole of aqueous ions is formed from gaseous ions, Second ionisation energy - The enthalpy change when one mole of gaseous 2+ ions is formed from one mole of gaseous 1+ ions when it loses one mole of electrons under standard conditions, Standard enthalpy of a reaction - The enthalpy change when reactions occur in molar quantities as shown in the chemical equation, Enthalpy change of atomisation of an element - Standard enthalpy change when one mole of gaseous atoms is formed from an element in its standard state under standard conditions, Enthalpy change of atomisation of a compound - Standard enthalpy change when one mole of a compound in its standard state is converted into gaseous atoms , First electron affinity - The standard enthalpy change when one mole of gaseous atoms is converted into one mole of gaseous ions, each with a single negative charge, under standard conditions, Standard enthalpy of formation - The enthalpy change involved when one mole of a substance is formed from its constituent elements, under standard conditions. The elements must be in their standard states, Lattice dissociation enthalpy - The enthalpy change when one mole of solid ionic compound is completely dissociated into its gaseous ions, Enthalpy change - The heat energy change under constant pressure, Bond dissociation enthalpy - The enthalpy change involved to break one mole of a covalent bond with all species in the gaseous state, Second electron affinity - The enthalpy change when one mole of gaseous 2- ions is made from one mole of 1- ions aquiring one mole of electrons under standard conditions, Lattice formation enthalpy - The enthalpy change involved when one mole of solid ionic compound is formed from its gaseous ions , Standard enthalpy change of combustion - The standard enthalpy change when one mole of a substance is completely burned in oxygen under standard conditions with all substances in standard states ,

Thermodynamics definitions :)

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