IBChemistrySLTopic QuestionsModels of Bonding & StructureThe Ionic Model

Syllabus Edition

First teaching 2023

First exams 2025

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The Ionic Model (SL IB Chemistry)

Topic Questions

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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

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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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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