Giant ionic structures
3 marks · EasyBarium chloride (BaCl_2) is an ionic compound.
Name the ions present in barium chloride.
State one property of barium chloride that is linked to its structure.
Explain how the structure of barium chloride leads to this property.
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(a) Ba^{2+} and Cl^- ions
(b) High melting point or conducts electricity when molten
(c) Strong electrostatic attractions between Ba^{2+} and Cl^- ions hold them in a giant lattice, needing high energy to break. · must show Strong attraction, Ions in lattice, Energy needed to break bonds
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Marking points
B1 (a) · 1 mark · Correctly names Ba^{2+} and Cl^- ions
B1 (b) · 1 mark · States a property: high melting point or conducts as molten
B1 (c) · 1 mark · Links property to structure (strong ionic forces or giant lattice)
Worked solution
a) Ba^{2+} and Cl^- ions.
b) High melting point.
c) Because the ions are held together by strong electrostatic attractions in a giant lattice, a lot of energy is needed to break the bonds and melt the solid.