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CAIE A-Level Chemistry AS 4 States of Matter Questions

Practise gas calculations and state-of-matter explanations using pV = nRT, ideal behaviour, volatility and bonding models.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Covered syllabus points

4.1 Gases: ideal, real and pV = nRT4.2 Bonding and structure

Question 1

[Maximum number: 1]

In the structure of solid SiO2\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?

x

y

z

2

1

covalent

2

1

ionic

4

2

covalent

4

2

ionic

Question 2

[Maximum number: 1]

Which assumptions are made about ideal gases?

1 Ideal gases contain molecules with no mass.
2 Ideal gases contain molecules with no volume.
3 Ideal gases have no intermolecular forces.

A

1, 2 and 3

B

1 and 2 only

C

1 and 3 only

D

2 and 3 only

Question 3

[Maximum number: 1]

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

A

Buckminsterfullerene exists as discrete molecules with weak intermolecular bonding.

B

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

C

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

D

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

Question 4

[Maximum number: 1]

What is the density of a sample of fluorine gas at 32∘C32^{\circ} \mathrm{C} and 100000 Pa ? Assume fluorine behaves as an ideal gas under these conditions.

A

1.4gdm−31.4 \mathrm{gdm}^{-3}

B

1.5gdm−31.5 \mathrm{gdm}^{-3}

C

1.6 gdm−31.6 \mathrm{~g} \mathrm{dm}^{-3}

D

1.7gdm−31.7 \mathrm{gdm}^{-3}

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