Enthalpy change of formation - is the enthalpy change when one mole of a compound is formed from its elements under standard condition, Enthalpy change of atomisation - is the enthalpy change when one mole of gaseous atom is formed from its element in its standard state under standard conditions, First ionisation energy - is the standard enthalpy change when one mole of a gaseous atom loses one mole of electron to form one mole of gaseous 1+ ion., Second ionisation energy - is the standard enthalpy change when one mole of gaseous 1+ ion loses one mole of electron to form one mole of gaseous 2+ ion, First electron affinity - is the standard enthalpy change when one mole of an electron is added to one mole of gaseous atom to form one mole of gaseous 1- ion.ost shell, and responsible for formation of chemical bonds, Lattice energy - is the enthalpy change when one mole of an ionic compound is formed from its gaseous ions, Enthalpy of solution - is the energy released or absorbed when one mole of an ionic compound is dissolved in sufficient amount of water to form an infinitely diluted solution under standard conditionsnd anions, Enthalpy of hydration - is the enthalpy change when one mole of gaseous ions dissolves in water to form a hydrated ion under standard conditions,

Grade 12 Revision Definitions

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