CAIE A-Level Chemistry AS 4.2 Bonding and Structure Questions

Practise identifying lattice type and using particles, bonding and mobility to explain physical properties.

Exam points

classify a solid as giant ionic, simple molecular, giant molecular or giant metallic
link melting or boiling point to the attractions or bonds overcome rather than merely naming the structure
explain conductivity and solubility through mobile charged particles and interactions with the solvent

Covered syllabus points

4.2.1—Describe, in simple terms, the lattice 4.2.2—Describe, interpret and predict the effect 4.2.3—The type of structure and bonding present

[Maximum number: 1]

In the structure of solid $\mathrm{SiO}_{2}$
> each silicon atom is bonded to x oxygen atoms each oxygen atom is bonded to y silicon atoms each bond is a z type bond.

What is the correct combination of x, y and z in these statements?

covalent

ionic

covalent

ionic

[Maximum number: 1]

Which statement explains why buckminsterfullerene has a lower melting point than graphite?

Buckminsterfullerene exists as discrete molecules with weak intermolecular bonding.

Graphite is partly ionic as its structure contains mobile electrons and it conducts electricity.

The carbon-carbon bonds in buckminsterfullerene are shorter and more strained.

The mobile electrons in graphite mean it has a metallic structure.

[Maximum number: 1]

The table shows physical properties of four substances, W, X, Y and Z.

Table for Question 3 — CAIE A-Level Chemistry AS

What are the identities of W, X, Y and Z ?

MgO

$\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{Br}$

$\mathrm{Al}_{2} \mathrm{O}_{3}$

MgO

HCl

$\mathrm{Al}_{2} \mathrm{O}_{3}$

NaF

$\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{Br}$

$\mathrm{SiO}_{2}$

NaF

HCl

$\mathrm{SiO}_{2}$

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Covered syllabus points

Question 1

Question 2

Question 3