Topic 13 Energetics

Question 1

Define Lattice Energy

Answer 1

as the energy change when one mole of an ionic solid is formed from its gaseous ions

Question 2

Define enthalpy change of atomisation

ΔatH

Answer 2

When one mole of gaseous atoms is formed from an element in its standard states, under standard conditions

Question 3

Define Electron Affinity

Answer 3

the energy change when each atom in one mole of atoms in the gaseous state gains an electron to form a -1nion

Question 4

Define enthalpy change of solution, ΔsolH

Answer 4

is the enthalpy change when one mole of an ionic solid dissolves in water to form an infinitely dilute solution

Question 5

Define enthalpy change of hydration, ΔhydH

Answer 5

is the enthalpy change when one mole of an ion in its gaseous state is completely hydrated by water