Energy

Question 1

Standard lattice enthalpy

Answer 1

Enthalpy change when 1 MOLE of an ionic lattice is formed from its gaseous ions under standard conditions.

Question 2

How does ionic charge and size affect lattice enthalpy?

Answer 2

• -> The higher the charge, the more energy is released when an ionic lattice forms, due to the stronger electrostatic forces between the ions.
• -> The smaller ion (small ionic radius, high charge density), the more exothermic the lattice enthalpy.

Question 3

First ionisation energy

Answer 3

The energy required in order to remove one mole of electrons from one mole of gaseous atoms.

Question 4

Enthalpy change of formation

Answer 4

Enthalpy change when 1 mole of a compound is formed from its elements in their standard form under standard conditions.