CourseCourseConceptConceptDocumentDocument

Edexcel A-Level Chemistry AS 3.19 Apply the Electron Pair Repulsion Theory to Predict the Shapes of and Bond Angles in Molecules and Ions Analogous to Those Questions

Practise predicting molecular shapes and bond angles from electron-pair arrangements, explaining lone-pair effects and drawing 3D structures using Edexcel IAL Chemistry evidence.

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 three-dimensional ion or molecule shapes with wedges, lone pairs and estimated bond angles.

Edexcel A-Level Chemistry AS 3.19 Apply the Electron Pair Repulsion Theory to Predict the Shapes of and Bond Angles in Molecules and Ions Analogous to Those Questions 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 Edexcel A-Level Chemistry AS 3.19 Apply the Electron Pair Repulsion Theory to Predict the Shapes of and Bond Angles in Molecules and Ions Analogous to Those Questions question 1 — Edexcel A-Level Chemistry AS

Cyclohexanol is the product of Reaction 2.

Figure for Question Edexcel A-Level Chemistry AS 3.19 Apply the Electron Pair Repulsion Theory to Predict the Shapes of and Bond Angles in Molecules and Ions Analogous to Those Questions 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)

All question bank results loaded