Enthalpy Definitions

Question 1

Enthalpy change of Formation

Answer 1

The enthalpy change when 1 mole of a compound is formed from it’s elements in their standard states

Question 2

1st ionisation energy

Answer 2

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

Question 3

Bond dissociation enthalpy

Answer 3

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

Question 4

Enthalpy change of atomistic of an element

Answer 4

The enthalpy change when 1 mole of gaseous atoms is formed from an element in its standard state

Question 5

Enthalpy change of atomisatoon of a compound

Answer 5

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

Question 6

2nd ionisation energy

Answer 6

The enthalpy change when 1 mole of gaseous 2+ ions is made from 1 mole of gaseous 1+ ions

Question 7

1st electron affinity

Answer 7

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

Question 8

2nd electronic affinity

Answer 8

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

Question 9

Enthalpy change of solution

Answer 9

The enthalpy change when 1 mole of an ionic substance dissolved in enough solvent to form an infinitely dilute solution

Question 10

Lattice dissociation enthalpy

Answer 10

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

Question 11

Lattice formation enthalpy

Answer 11

The enthalpy change when 1 mole of a solid ionic compound is formed from its gaseous ions

Question 12

Enthalpy change of hydration

Answer 12

The enthalpy change whenb1 mole of aqueous ions is formed from gaseous ions