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IBChemistryHLExam QuestionsModels of Bonding & StructureThe Ionic Model

Syllabus Edition

First teaching 2023

First exams 2025

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The Ionic Model (HL IB Chemistry)

Exam Questions

2 hours22 questions

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The Ionic Model

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The Ionic Model

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11 mark

Which of the following statements about ions and ionic compounds are true? 

  1.   Nitrogen can form a 3- ion
  2.   Potassium can form a cation
  3.   The formula for aluminium chloride is AlCl2

  • I and II only

  • I and III only

  • II and III only 

  • I, II and III

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21 mark

What is the correct formula for ammonium carbonate?

  • NH3CO3

  • NH4CO3

  • (NH4)2CO3

  • (NH4)3CO3

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31 mark

Which crystal structure does not conduct electricity when solid, has a high melting point and can conduct electricity when molten?

  • Giant metallic

  • Giant ionic

  • Macromolecular

  • Simple molecular

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41 mark

Which of the following compounds is not bonded ionically?

  • CaCO3

  • CH3OH

  • NaOH

  • BaCl2

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51 mark

Magnesium oxide has a very high melting temperature.

Which of the following is the best description of its structure and bonding?

  • Giant ionic

  • Giant metallic

  • Macromolecular 

  • Simple molecular 

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11 mark

Which of the following compounds has both covalent and ionic bonds?

  • calcium bromide, CaBr2

  • potassium carbonate, K2CO3

  • propanoic acid, CH3CH2COOH

  • dichloromethane, CH2Cl2

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21 mark

Which is the best description of ionic bonding?

  • electrostatic attraction between cations and electrons

  • electrostatic attraction between nuclei

  • electrostatic attraction between oppositely charged ions

  • electrostatic attraction of nuclei towards shared electrons in the bond between the nuclei

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31 mark

 Potassium bromide is an ionic compound. 

When can potassium bromide conduct electricity?

 

Solid

Molten

Aqueous

A

✓

✓

⨯

B

✓

⨯

✓

C

⨯

✓

✓

D

⨯

⨯

✓

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    41 mark

    Aluminium iodide, Al2I6 is a dimer and exists as a solid at room temperature. When it is a vapour it can exist as an AlI3 molecule. 

    How many valence electrons are in an aluminium iodide, AlI3, molecule?

    • 22

    • 24

    • 26

    • 28

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    51 mark

    Which of the following substances has the highest melting point?

    • Mg

    • NaO

    • O2

    • C (graphite)

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    11 mark

    What are the correct formulas for the following ions? 

     

    Phosphate

    Ammonium

    Ethanoate

    Nitrite

    A

    PO43-

    NH4+

    CH3COO+

    NO3-

    B

    PO32-

    NH4-

    CH3COO-

    NO2-

    C

    PO43-

    NH4+

    CH3COO-

    NO2-

    D

    PO42-

    NH4+

    CH3CH2COO-

    NO3-

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      21 mark

      Of the four compounds listed below which one has the greatest ionic character?

      • HCl

      • MgS

      • CO2

      • CaO

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      31 mark

      What is the correct formula for aluminium sulfate?

      • Al3(SO4)2

      • Al(SO4)2

      • Al2(SO4)3

      • AlSO4

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