Unit 5 Chemistry - Thermodynamics Definitions

Question	Answer
Enthalpy of hydration	Enthalpy change when 1 mole of gaseous ions forms aqueous ions
Lattice enthalpy of dissociation	Enthalpy change when 1 mole of an ionic compound is separated into it's gaseous ions
Lattice enthalpy of formation	Enthalpy change to form 1 mole of an ionic substance from it's gaseous ions
Mean bond dissociation enthalpy	The average enthalpy change to break the bond(s) in one mole of a substance/ molecules of a substance to form its gaseous atoms
Electron affinity	Enthalpy change when 1 mole of gaseous atoms forms 1 mole of gaseous negative ions
Enthalpy of atomisation	enthalpy change when 1 mole of gaseous atoms is formed from the element in it's standard state
Perfect ionic model	Ions are perfect spheres and the compound contains only electrostatic forces of attraction
Enthalpy of formation	Enthalpy change when 1 mole of a substance is formed from it's elements and all reactants and products are in their standard state
Enthalpy of solution	Enthalpy change when one mole of a compound/ substance forms it's aqueous ions
Ionisation enthalpy	Enthalpy change when 1 mole of gaseous atoms is forms 1 mole of gaseous positive ions

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	Created by Wannie Chisala over 11 years ago