Energetics

Question 1

Define lattice energy

Answer 1

The energy change when one mole of an ionic solid is formed from its gaseous ions.

(g) -> (s)

Question 2

Define enthalpy change of atomisation

Answer 2

The enthalpy change when one mole of gaseous atoms is formed from its standard state.

(_) -> (g)

Question 3

Define electron affinity.

Answer 3

The enthalpy change when one mole of gaseous atoms each gain one one electron to form one mole of gaseous -1 ions.

(g) -> - (g)

Question 4

Define enthalpy change of solution

Answer 4

The enthalpy change when one mole of an ionic solid dissolves in water to form an infinetely dilute solution.

(s) -> (aq)

Question 5

Define enthalpy change of hydration.

Answer 5

The enthalpy change when one mole of gaseous ions is completely hydrated by water.