Chapter 22- Enthalpy and entropy

Question 1

Define lattice enthalpy

Answer 1

Enthalpy change that accompanies the formation of one mole of an ionic compound from its gaseous ions under standard conditions.

Question 2

Define standard enthalpy change of atomisation

Answer 2

Enthalpy change that takes place for the formation of one mole of gaseous atoms from the element in its standard state under standard conditions.

Question 3

Define first electron affinity

Answer 3

Enthalpy change that takes place when one electron is added to each atom in one mole of gaseous atoms to form one mole of gaseous 1- ions.

Question 4

Define standard enthalpy change of a solution

Answer 4

Enthalpy change that takes place when one mole of a solute dissolves in a solvent.

Question 5

Define enthalpy change of hydration

Answer 5

Enthalpy change that accompanies the dissolving of gaseous ions in water to form one mole of aqueous ions.

Question 6

Define standard entropy

Answer 6

The entropy of one mole of a substance under standard conditions.