IB Chemistry HL 2.4.2 The bonding triangle and material conductivity Question Bank

Practise IB Chemistry HL 2.4.2 by evaluating electronegativity-based bonding predictions and their consequences for material properties.

Exam points

Analyse electronegativity data to compare ionic character across several compounds.
Link bond type and ion mobility to conductivity in molten or solid materials.
Evaluate the limits of a simple electronegativity classification for compounds with mixed character.

[Maximum number: 2]

A sample of bromine has the following composition by mass:

\begin{array}{cc} { }^{79} \mathrm{Br}: & 50.75 \% \\ { }^{81} \mathrm{Br}: & 49.25 \% \end{array}

Deduce, showing your working, the type of bonding and percentage covalent character in calcium bromide, $\mathrm{CaBr}_{2}$ . Use sections 9 and 17 of the data booklet.

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2.4.2—Bonding triangle question 1