Born Haber Definitions

Question 1

Define the lattice formation enthalpy.

Answer 1

The enthalpy change when one mole of a solid ionic compound is formed from its gaseous ions under standard conditions.

Question 2

Define the lattice dissociation enthalpy.

Answer 2

The enthalpy change when one mole of a solid ionic compound is completely dissociated into its gaseous ions under standard conditions.

Question 3

Define the enthalpy change formation.

Answer 3

The enthalpy change when one mole of a compound is formed from its elements in their standard states under standard conditions.

Question 4

Define the bond dissociation enthalpy.

Answer 4

The enthalpy change when all of the bonds of the same type in one mole of gaseous molecules are broken.

Question 5

Define the enthalpy change of atomisation.

Answer 5

The enthalpy change when one mole of an element or compound in its standard states are converted into gaseous atoms.

Question 6

Define the first ionisation enthalpy.

Answer 6

The enthalpy change when one mole of gaseous ions (1+) are formed from one mole of gaseous atoms.

Question 7

Define the first electron affinity.

Answer 7

The enthalpy change when one mole of gaseous ions (1-) is made from one mole of gaseous atoms.

Question 8

Define the enthalpy change of hydration.

Answer 8

The enthalpy change when one mole of gaseous ions is formed from gaseous ions.

Question 9

Define the enthalpy change of solution.

Answer 9

The enthalpy change when one mole of a solute is dissolved in sufficient solvent that no further enthalpy change occurs on further dilution.

Question 10

What are standard conditions?

Answer 10

100kPa, 298k and pure elements.