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CAIE A-Level Chemistry AS 9.1 Periodicity of Physical Properties of the Elements in Period 3 Questions

Practise describing Period 3 trends in radii, melting point and conductivity and explaining structural discontinuities.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • describe atomic-radius and ionic-radius patterns across Period 3 from data or a plotted trend
  • relate metallic conductivity and melting point to ion charge, radius and delocalised electrons
  • explain the silicon-to-phosphorus melting-point fall by giant covalent versus simple molecular structure

Covered syllabus points

9.1.1—Period 3 physical property trends9.1.2—Variation in melting point and electrical

Question 1

[Maximum number: 1]

Which statement is correct?

A

The atomic radius of silicon is larger than that of aluminium.

B

The boiling point of chlorine is higher than that of silicon.

C

The first ionisation energy of sulfur is greater than that of phosphorus.

D

The electrical conductivity of magnesium is greater than that of sodium.

Question 2

[Maximum number: 1]

The melting points of the Period 3 elements sodium to aluminium are shown in the table.

Table for Question 2 — CAIE A-Level Chemistry AS

Which factor explains the increase in melting points from sodium to aluminium?

A

the change in first ionisation energy from sodium to aluminium

B

the increase in electronegativity from sodium to aluminium

C

the increase in the ArA_{r} of the elements from sodium to aluminium

D

the increase in the number of outer electrons in each atom from sodium to aluminium

Question 3

[Maximum number: 1]

Which statement is correct?

A

Adding sodium oxide to water gives a lower pH solution than adding silicon oxide to water.

B

The oxidation state of sodium in its chloride is higher than the oxidation state of silicon in its chloride.

C

The atomic radius of sodium is larger than that of silicon.

D

The melting point of the chloride of sodium is lower than the melting point of the chloride of silicon.

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