Enthalpy change

• Standard molar enthalpy of formation

  The enthalpy change when one mole of a compound is formed from its constituent elements under standard conditions.]
• The standard molar enthalpy change of combustionThe standard molar enthalpy change of combustion

  The enthalpy change when one mole of substance is completely burnt in oxygen.
• Standard enthalpy of atomisation

  Enthalpy change which accompanies the formation of one mole of gaseous atoms from the element in its standard state under standard conditions.
• First ionisation energy

  Standard enthalpy change when one mole of gaseous atoms is converted into a mole ions each with a single positive.
• Second ionisation energy

  refers to loss of a mole of electrons from a mole of singly positively charged ions
• First electron affinity


  Standard enthalpy change when a mole of gaseous atoms is converted to a mole of gaseous ions with a single negative charge
• The second electron affinity

  The enthalpy change when a mole of electrons is added to a mole of gases ions each with a single negative charge to form ions with two negative charges.
• Lattice enthalpy of formation

  Standard enthalpy change when one mole of solid ionic compound is formed from its gaseous ions.
• Lattice enthalpy of dissociation

  standard enthalpy change when one mole of solid ionic compounds dissociated into its gaseous ions.
• Enthalpy of solution

  Standard enthalpy when one mole of solute dissolves completely in sufficient solvent to form a solution in which the molecules or ions are far enough apart to not interact with eachother
• Enthalpy of hydration

  standard enthalpy change when 1 mole of gases ions are converted into aqueous ions or aqueous solution
• Mean bond enthalpy

  Enthalpy change when one mole of gaseous molecules each breaks a covalent bond to form two free radicals, averaged over a range of compounds.