IB Chemistry SL 2.1.3 Ionic Compounds

Practise linking a three-dimensional ionic lattice to the characteristic behaviour of its compounds. Use charge and ionic radius to compare attraction strength, and explain…

Syllabus
First assessment 2025
Objective
2.1.3
Level
SL

Exam points

  • compare ionic attraction using ionic charge and radius within a lattice
  • explain conductivity by whether charged ions are fixed or mobile in the state given
  • deduce an ionic structure from a combination of melting, solubility and conductivity data

2.1.3—Ionic compounds question 1

[Maximum number: 3]

Periodic trends enable chemists to predict the behaviour of related compounds.

Na2O\quad \mathrm{Na}_{2} \mathrm{O} and SO3\mathrm{SO}_{3} are two oxides of period 3 elements.

Na2O\quad \mathrm{Na}_{2} \mathrm{O} does not conduct electricity in the solid state but it does when molten. Pure SO3\mathrm{SO}_{3} does not conduct electricity in either the solid or liquid states. Explain these facts.

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