IBChemistryDPHLExam QuestionsModels of Bonding & StructureThe Ionic Model

The Ionic Model (DP IB Chemistry: HL): Exam Questions

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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? 

I.  Nitrogen can form a 3- ion

II. Potassium can form a cation

III. The formula for aluminium chloride is AlCl2

  • I and II only

  • I and III only

  • II and III only 

  • I, II and III

Choose your answer

21 mark

What is the correct formula for ammonium carbonate?

  • NH3CO3

  • NH4CO3

  • (NH4)2CO3

  • (NH4)3CO3

Choose your answer

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

  • Covalent network

  • Simple molecular

Choose your answer

41 mark

Which of the following compounds is not bonded ionically?

  • CaCO3

  • CH3OH

  • NaOH

  • BaCl2

Choose your answer

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

  • Network covalent

  • Simple molecular 

Choose your answer

11 mark

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

  • calcium bromide, CaBr2

  • potassium carbonate, K2CO3

  • propanoic acid, CH3CH2COOH

  • dichloromethane, CH2Cl2

Choose your answer

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

Choose your answer

31 mark

 Potassium bromide is an ionic compound. 

When can potassium bromide conduct electricity?

 

Solid

Molten

Aqueous

A

✓

✓

⨯

B

✓

⨯

✓

C

⨯

✓

✓

D

⨯

⨯

✓

    Choose your answer

    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

    Choose your answer

    51 mark

    Which of the following substances has the highest melting point?

    • Mg

    • Na2O

    • O2

    • C (graphite)

    Choose your answer

    11 mark

    What are the correct formulas for the following ions? 

     

    Phosphate

    Ammonium

    Ethanoate

    Nitrate

    A

    PO43-

    NH4+

    CH3COO+

    NO2-

    B

    PO32-

    NH4-

    CH3COO-

    NO2-

    C

    PO43-

    NH4+

    CH3COO-

    NO3-

    D

    PO42-

    NH4+

    CH3CH2COO-

    NO3-

      Choose your answer

      21 mark

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

      • HCl

      • MgS

      • CO2

      • CaO

      Choose your answer

      31 mark

      What is the correct formula for aluminium sulfate?

      • Al3(SO4)2

      • Al(SO4)2

      • Al2(SO4)3

      • AlSO4

      Choose your answer