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IB Chemistry SL Structure 2 Models of Bonding and Structure Questions

Practise IB Chemistry SL Structure 2 with reviewed questions on ionic, covalent and metallic bonding, molecular structure, intermolecular forces and materials.

Syllabus
First assessment 2025
Course
Chemistry SL
Level
SL

Exam points

  • Predict ion formation and construct neutral ionic formulae from electron configurations and ion charges.
  • Construct Lewis structures and use VSEPR to predict molecular geometry, bond angles and polarity.
  • Explain covalent-network and metallic properties using bonding models and particle structure.
  • Identify intermolecular forces and relate them to phase changes, solubility and physical properties.
  • Use electronegativity, bond strength and material structure to compare bonding and properties.

Covered syllabus points

2.1 The ionic model2.2 The covalent model2.3 The metallic model2.4 From models to materials

Learn this topic

Study Structure 2. Models of bonding and structure conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

Question 1

[Maximum number: 1]

How many electrons will be gained or lost when the element with electron configuration 1s22s22p31 s^{2} 2 s^{2} 2 p^{3} forms an ionic bond?

A

Two electrons lost

B

Two electrons gained

C

Three electrons lost

D

Three electrons gained

Question 2

[Maximum number: 6]

Ethyne, C2H2\mathrm{C}_{2} \mathrm{H}_{2}, reacts with oxygen in welding torches.

Question (a)

(a)

Deduce the Lewis (electron dot) structure of ethyne.

[ 1 ]

Question (b)

(b)

Compare, giving a reason, the length of the bond between the carbon atoms in ethyne with that in ethane, C2H6\mathrm{C}_{2} \mathrm{H}_{6}.

[ 1 ]

Question (c)

(c)

Identify the type of interaction that must be overcome when liquid ethyne vaporizes.

[ 1 ]

Question (d)

(d)

Product B,CH3CHO\mathbf{B}, \mathrm{CH}_{3} \mathrm{CHO}, can also be synthesized from ethanol.

[ 3 ]

Question (i)

(i)

Explain why product B is water soluble.

[ 3 ]

Question 3

[Maximum number: 6]

Iron may be extracted from iron (II) sulfide, FeS.

Question (a)

(a)

Outline why metals, like iron, can conduct electricity.

[ 1 ]

Question (b)

(b)

Iron (II) sulfide, FeS , is ionically bonded.

[ 3 ]

Question (i)

(i)

Describe the bonding in this type of solid.

[ 2 ]

Question (ii)

(ii)

Suggest why chemists find it convenient to classify bonding into ionic, covalent and metallic.

[ 1 ]

Question (c)

(c)

Explain why the addition of small amounts of carbon to iron makes the metal harder.

[ 2 ]
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