Enthalpy change A level Definitions

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1. Enthalpy change of lattice enthalpy of formation

  • E.C when one mole of gaseous atom is produced from an element in its standard states
  • E.C when one mole of solid ionic compound is formed from its constituent elements in gas phase
  • E.C when one mole of solid ionic compound is broken from its constituent ions in gas phase
  • E.C when one mole of gaseous ions become hydrated
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2. Enthalpy change of atomisation

  • E.C when one mole of gaseous ions become hydrated
  • E.C when one mole of gaseous atom is produced from an element in its standard states
  • E.C when all ions in one mole of -1 gaseous ion gains an electron to form one mole of gaseous -2 ions
  • E.C when one mole of solid ionic compound is formed from its constituent ions in gas phase

3. Enthalpy change of 1st electron affinity

  • E.C when one mole of ionic solid dissolves in a large volume of water so that none of the ions interact
  • E.C when each atom in one mole of gaseous atom gains an electron to form one mole of -1 gaseous ions
  • Energy required to form one mole of a solid ionic lattice from its gaseous ions under standard conditions
  • E.C when all ions in one mole of -1 gaseous ions all gain an electron to form one mole of -2 gaseous ions

4. Enthalpy change of lattice enthalpy of dissociation

  • E.C when one mole of ionic solid dissolves in a large volume of water so that all the ions are well separated
  • E.C when one mole of solid ionic compound is formed from its constituent ions in gas phase
  • E.C when one mole of solid ionic compound is broken from its constituent ions in gas phase
  • E.C when one mole of -1 gaseous ions all gain an electron to form one mole of gaseous -2 ions

5. Enthalpy change of solution

  • E.C when one mole of gaseous atom is produced from an element in its standard states
  • E.C when one mole of an ionic solid dissolves in a large volume of water so that all the ions are well separted and do not ineract with each other
  • E.C when one mole of gaseous ions become hydrated
  • E.C when one mole of solid ionic compund is broken from its consituent ions in gas phase

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