Lattice energy

Question 1

Predict and explain the variation in enthalpy change of hydration for the ions F-,Cl-,Br- and I- (2)

Answer 1

Becomes less exothermic down the group from F to I and due to increase in size, there is a decrease attraction to water or weak ion-dipole force to water.

Question 2

Define lattice energy (2)

Answer 2

Energy change when one mole of an ionic compound is formed from its gaseous ions.