Thermodynamics

Question 1

Enthalpy of lattice dissociation

Answer 1

The enthalpy change to separate one mole of solid ionic compound into its gaseous ions

Question 2

Enthalpy of lattice formation

Answer 2

Enthalpy change when one molecule of a solid ionic compound is formed from its gaseous ions

Question 3

Standard Enthalpy of formation

Answer 3

Enthalpy change when one mole of a compound is formed from its constituent elements with all reactants and products in standard states (hess’ law)

Question 4

Standard Enthalpy of atomisation

Answer 4

The Enthalpy change when one mole of gaseous atoms is formed from the element in its standard state

Question 5

Bond Enthalpy

Answer 5

The heat energy required to break one mole of a given covalent bond in molecules in the gaseous state
(Cl2 bond Enthalpy is 2x its atomisation)

Question 6

First ionisation energy

Answer 6

Energy needed to remove one mole of electrons from one mole of atoms in the gaseous state

Question 7

Second ionisation energy

Answer 7

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

Question 8

First electron affinity

Answer 8

Enthalpy change when one mole of gaseous 1- ions are formed from one Mole of gaseous atoms

Question 9

Second electron affinity

Answer 9

The Enthalpy change when one mole of gaseous 2- ions are formed from one mole of gaseous 1- ions