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Edexcel IAL Chemistry 3.18 Molecular shapes and bond angles

Count electron regions and lone pairs, identify the parent geometry and state the accepted angle, then explain any deviation through stronger lone-pair repulsion.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • Complete shape-and-angle tables for methane, ammonia, water, BeCl2 and BCl3.
  • Draw and label three-dimensional structures for CO2, PCl5, SF6 and related species.
  • Explain bond-angle changes when lone pairs or coordinate bonds alter repulsion.

3.20—Metals consist of giant lattices of metal ions in a sea of delocalised electrons question 1

[Maximum number: 3]

This question is about the element calcium and some of its compounds.

Calcium reacts with chlorine to form calcium chloride.

Ca( s)+Cl2( g)→CaCl2( s)\mathrm{Ca}(\mathrm{~s})+\mathrm{Cl}_{2}(\mathrm{~g}) \rightarrow \mathrm{CaCl}_{2}(\mathrm{~s})

Complete the table to indicate the type(s) of bonding and structure in the species involved in this reaction.

Table for Question 3.20—Metals consist of giant lattices of metal ions in a sea of delocalised electrons question 1 — Edexcel A-Level Chemistry AS
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