Thermodynamics

Question 1

What is the enthalpy change of formation?

Answer 1

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

Question 2

Lattice enthalpy of dissociation

Answer 2

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

Question 3

Enthalpy change of dissociation

Answer 3

The enthalpy change when 1 mole of bonds of the same type of molecule in the gaseous state is broken.

Question 4

Enthalpy change of 1st ionisation

Answer 4

The enthalpy change when 1 mole of gaseous 1+ ions are made from 1 mole of gaseous atoms.

Question 5

Enthalgy change of
atomisation

Answer 5

The enthalpy change when 1 mole of gaseous atoms is made from an element in it’s standard state.

Question 6

Lattice enthalpy of formation

Answer 6

The enthalpy change when 1 mole of a solid ionic compound
is formed from it’s gaseous ions under standard conditions.

Question 7

Enthalpy change of 2nd ionisation

Answer 7

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

Question 8

1st electron affinity

Answer 8

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

Question 9

2nd electron affinity

Answer 9

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

Question 10

Enthalpy change of 2nd ionisation

Answer 10

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

Question 11

Enthalpy of hydration

Answer 11

Enthalpy change when 1 mole of aqueous ions is made from 1 mole of gaseous ion