Enthalpy and Entropy

Question 1

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

What does Lattice Enthalpy involve?

Answer 2

It involves bond formation from separate gaseous ions. It is an exothermic change (value will be negative).

Question 3

Solid ionic compounds

Answer 3

• Stable which arises from the strength of ionic bonds, electrostatic attractions between oppositely charged ions in the ionic in the ionic lattice structure
• This creates a substantial energy barrier that must be overcome to break down the lattice which is reflected by high melting points
• Lattice enthalpy is the measure of the strength of ionic bonding in a giant lattice.

Question 4

How can lattice enthalpy be measured?

Answer 4

Lattice enthalpy is calculated indirectly using known changes