IBChemistryHLExam QuestionsModels of Bonding & StructureFrom Models to Materials

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First teaching 2023

First exams 2025

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From Models to Materials (HL IB Chemistry)

Exam Questions

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11 mark

Which of the following statements about alloys are correct? 

  1.   Alloys contain atoms of all the same sizes
  2.   An alloy is a mixture of a metal with another element
  3.   Alloys are harder than the pure metal they originate from

  • I and II only

  • I and III only

  • II and III only

  • I, II and III

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21 mark

A molecule of a polymer contained the sequence shown.

10-2-e-q5-ib-chemistry-mcqs


Which monomer could produce this polymer by addition polymerisation?

  • CHCl =CHCl

  • CH2=CHCl

  • CH3CCl =CHCl

  • CH3CCl =CH2

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31 mark

The structure below shows the repeating pattern of a polymer.

7-6-q-2-mcq-al-chem

Which pair of compounds could react rapidly to form this polymer?

  • Butane-1,4-diol and propanedioic acid

  • Propane-1,3-diol and butanedioic acid

  • Butanoyl chloride and propane-1,3-diol

  • Propane-1,3-diol and butanedioyl dichloride

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41 mark

Which of the following chemicals is not correctly placed within this triangular bonding triangle?

bonding-model-triangle-e-mcq

  • Li2O

  • CH4

  • CBr4

  • Mg

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51 mark

Using a triangular bonding diagram, which of the following cannot be deduced about an unknown chemical?

  • The formula of the unknown chemical.

  • The physical properties of the unknown chemical.

  • The type of bonding present in the unknown chemical.

  • Whether the unknown chemical is an element or a compound.

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11 mark

Which type of bonding can be described as ‘the electrostatic attraction between positive nuclei and electrons and occurs by the sharing of electrons’? 

  • Hydrogen bonding

  • Ionic bonding 

  • Metallic bonding 

  • Covalent bonding 

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21 mark

A binary compound is plotted on a triangular bonding diagram. The electronegativity values for each element are 1.6 and 3.4.

Which estimate for the percentage ionic and percentage covalent character in the compound is correct?

  • 10% covalent, 90% ionic

  • 40% covalent, 60% ionic

  • 55% covalent, 45% ionic

  • 100% covalent, 0% ionic

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31 mark

Plastics made from this polyester, with the following repeat unit, only soften at high temperatures.

7-6-q2-m-mcq-al-chem

Which statement correctly explains the reason for this?

  • The polymer chains contain strong carbon-carbon bonds.

  • The polymer chains contain hydrogen bonding and van der Waals’ forces between them.

  • The polymer chains contain permanent dipole-dipole forces and van der Waals’ forces between them.

  • The polymer chains contain strong carbon-oxygen bonds.

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11 mark

The properties of alloys can be explained in terms of metals having

  1. Non-directional bonding
  2. Delocalised electrons
  3. Ions of different size

  • I and II only

  • I and III only

  • II and III only

  • I, II and III

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21 mark

Using Sections 9 and 17 of the Data Booklet, which of the following predictions about gallium tribromide is/are not correct?

  1. It is a poor insulator.
  2. It has a high melting and boiling point.
  3. It is hard and brittle.

  • I and II only

  • I and III only

  • II and III only

  • I, II and III

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31 mark

In terms of n, state the number of molecules of water formed in the condensation polymerisation of n molecules of a dicarboxylic acid with n molecules of a diol to form a polyester.

  • n

  • n + 1

  • 2n - 1

  • 2n + 1

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