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A-Level Edexcel Chemistry Molecular Shapes and Bond Angles

Review A-Level Edexcel Chemistry molecular shapes and bond angles through VSEPR predictions, lone-pair effects and 3D structure diagrams.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • predict molecular shapes and bond angles from bonding pairs, lone pairs and VSEPR
  • justify angle changes using lone-pair repulsion versus bond-pair repulsion
  • draw 3D ion or molecule shapes with wedges, lone pairs and estimated bond angles

3.19—Apply the electron-pair repulsion theory to predict the shapes of, and bond angles in, molecules and ions analogous to those question 1

[Maximum number: 3]

This question is about ethene, C2H4\mathrm{C}_{2} \mathrm{H}_{4}.

Two reactions of cyclohexene are shown.

Figure for Question 3.19—Apply the electron-pair repulsion theory to predict the shapes of, and bond angles in, molecules and ions analogous to those question 1 — Edexcel A-Level Chemistry AS

Cyclohexanol is the product of Reaction 2.

Figure for Question 3.19—Apply the electron-pair repulsion theory to predict the shapes of, and bond angles in, molecules and ions analogous to those question 1 — Edexcel A-Level Chemistry AS

Bond angle a=109.5∘\mathrm{a}=109.5^{\circ}
Explain why bond angle b is smaller than bond angle a.
Include the expected value for bond angle b in your answer.
(3)

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