Born Haber Cycles

Question 1

Enthalph changes of (Sublimation, Dissociation, Formation)

Answer 1

Sublimation is M(s) to M(g)

Dissociation is X2(g) to 2X(g)

Enthalpy change of formation is the enthalpy change to form MX(s) from M(s) + 0.5X2(g). In other words, form the compound from its constituent elements in their standard states

Question 2

Ionisation Energy
Electron affinity
Lattice energy

Answer 2

Ie = ionisation energy and is endo thermic (taking off an electron to make it a cation)

Ea = electron affinity is exothermic (adding an electron to make it an anion)

UL = Lattice energy is exothermic (formation of compound from consitiuent elements in their gaseous states)