Definitions lattice enthalpies

Question 1

Lattice formation enthalpy

Answer 1

The enthalpy change when 1 mile of a solid ionic compound is formed from its gaseous ions under standard conditions

Question 2

Lattice dissociation enthalpy

Answer 2

The enthalpy change when 1 mole of a solid ionic compound is completely dissociated into its gaseous ions under standard conditions

Question 3

Enthalpy change of formation

Answer 3

The enthalpy change when 1 mole of a compound is formed from its elements in their standard states under standard conditions

Question 4

Bond dissociation enthalpy

Answer 4

The enthalpy change when all the bonds of the same type in 1 mole of gaseous molecules are broken

Question 5

Enthalpy change of atomisation of an element

Answer 5

Enthalpy change when 1 mole of gAseous atoms is formed from an element in its standard state

Question 6

Enthalpy change of atomisation of a compound

Answer 6

Enthalpy change when 1 mole of a compound in its standard state is converted to gaseous atoms

Question 7

The first ionisation enthalpy

Answer 7

The enthalpy change when 1 mole of gaseous 1+ ions is formed from 1 mole of gaseous atoms

Question 8

The second ionisation enthalpy

Answer 8

Enthalpy change when 1 mole of gaseous 2+ ions is formed from 1 mole of gaseous 1+ ions

Question 9

First electron affinity

Answer 9

Enthalpy change when 1 mole of gaseous 1- ions is made from 1 mole of gaseous atoms

Question 10

Second electron affinity

Answer 10

Enthalpy change when 1 mole of gaseous 2- ions is made from 1 mole of gaseous 1- ions

Question 11

Enthalpy change of hydration

Answer 11

Enthalpy change when 1 mole of aqueous ions is formed from gaseous ions

Question 12

Enthalpy change of solution

Answer 12

Enthalpy change when 1 mole of solute is dissolved in sufficient solvent that no further enthalpy change occurs on further dilution

Question 13

Enthalpy change

Answer 13

The heat energy transferred in a reaction at constant pressure