Thermodynamics

Question 1

Enthalpy change of formation

Answer 1

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

Question 2

Lattice Enthalpy of formation

Answer 2

The EC when 1 mole of a solid ionic compound is formed from its gaseous ions under standard conditions

Question 3

Lattice Enthalpy of dissociation

Answer 3

The EC when 1 mole of a solid ionic compound is dissociated into it’s gaseous ions under standard conditions

Question 4

Enthalpy change of combustion

Answer 4

The EC when 1 mole of of a substance undergoes complete combustion in oxygen with all substances in their SS

Question 5

Ionisation enthalpy

Answer 5

The EC when 1 mole of gaseous atoms looses 1 e- per atom to produce 1+ gaseous ions

Question 6

Electron affinity

Answer 6

The EC when 1 mole of gaseous atoms gains 1 e- per atom to from gaseous 1- ions

Question 7

Enthalpy of atomisation

Answer 7

The EC when 1 mole of gaseous atoms is produced from an element in it’s SS

Question 8

Hydration enthalpy

Answer 8

The EC when 1 mole of gaseous ions become hydrated (dissolved in water)

Question 9

Enthalpy of solution

Answer 9

The EC when 1 mole of an ionic solid dissolves in an amount of water large enough so that the dissolved ions are well separated and don’t interact with each other

Question 10

Bond dissociation enthalpy

Answer 10

The EC when 1 mole of covalent bonds is broken in the gaseous state