Enthalpy types

Question 1

Enthalpy of formation

Answer 1

• when one mole of a substance is formed from its constituent elements under standard conditions

Question 2

Enthalpy of combustion

Answer 2

• when one mole of a substance is combusted completely with oxygen under standard conditions

Question 3

Enthalpy of neutralisation

Answer 3

• when an acid and an alkali react to from one mole of water under standard conditions

Question 4

Enthalpy of ionisation (1st, 2nd, 3rd….)

Answer 4

• when one mole of gaseous atoms lose an electron

Question 5

Enthalpy of electron affinity

Answer 5

• when every ion in one mole of gaseous substance gains an electron

Question 6

Enthalpy of atomisation

Answer 6

• when one mole of gaseous atoms is produced from its constituent elements

Question 7

Enthalpy of hydration

Answer 7

• When one mole of gaseous atoms is dissolved in water

Question 8

Enthalpy of solution

Answer 8

• when one mole of an ionic solid is dissolved in water

Question 9

Enthalpy of bond dissociation

Answer 9

• when one mole of covalent bonds is broken into a gaseous state

Question 10

Lattice enthalpy of formation

Answer 10

• when one mole of a solid ionic compound is formed from its gaseous ions

Question 11

Lattice enthalpy of dissociation

Answer 11

• when one mole of a solid ionic compound is broken into its gaseous ions

Question 12

Enthalpy of vaporisation

Answer 12

• when 1 mole of liquid is evaporated into a gas

Question 13

Enthalpy of fusion

Answer 13

• when one mole of solid is melted into a liquid