Giant ionic structures
2 marks · NormalDescribe the structure of a giant ionic compound and explain how this structure is linked to its melting point.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
Must show: Ions arranged in lattice, Strong electrostatic forces
Also accept: Many ions strongly attracted; Large amount of energy needed
Show mark scheme and worked solution
Marking points
B1 · 1 mark · Describes the structure as a giant lattice of positive and negative ions.
B2 · 1 mark · Links strong electrostatic attractions between ions to a high melting point (lots of energy required).
Worked solution
A giant ionic compound has a regular lattice of positive and negative ions.
The strong electrostatic forces between the ions mean that a lot of energy is needed to break the lattice, so it has a high melting point.