ConceptConceptDocsDocuments

CAIE A-Level Chemistry 9 Period 3 Chemical Periodicity

Practise interpreting Period 3 trends in physical properties and explaining them through structure and bonding.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Covered syllabus points

9.1 Periodicity of physical properties of the elements in Period 39.2 Periodicity of chemical properties of the elements in Period 39.3 Chemical periodicity of other elements

9. The Periodic Table: chemical periodicity question 1

[Maximum number: 7]

Question (a)

(a)

Table 1 gives physical data for some of the Period 3 elements.

Table 1

Table 1

[ 1 ]

Question (i)

(i)

Complete the row in the table labelled 'maximum oxidation number'.

[ 1 ]

Question (b)

(b)

Use the axes to sketch a graph that shows the trend in melting points of the elements with atomic numbers 11 to 17.

Figure for Question (b) — CAIE A-Level Chemistry AS
[ 2 ]

Question (c)

(c)

Dmitri Mendeleev published the first Periodic Table in 1869.

Mendeleev used his knowledge of chemical periodicity to propose the properties of gallium, 31Ga{ }_{31} \mathrm{Ga}, a Group 13 element.

Table 2 gives some chemical and physical data of elements in Group 13.

Table 2

Table 2

Complete the table by predicting values for the missing data.

[ 3 ]

Question (d)

(d)

Indium and aluminium are elements in Group 13 of the Periodic Table.

Indium has very similar chemical properties to aluminium.
- Indium reacts vigorously with hydrochloric acid to form a colourless gas and a salt in solution.
- Indium oxide, In2O3\mathrm{In}_{2} \mathrm{O}_{3}, is amphoteric.
- Gaseous indium bromide has the formula In2Br6\mathrm{In}_{2} \mathrm{Br}_{6}. This molecule contains coordinate bonds.

[ 1 ]

Question (i)

(i)

Construct an equation for the reaction of In2O3\mathrm{In}_{2} \mathrm{O}_{3} with excess aqueous NaOH .

[ 1 ]

9. The Periodic Table: chemical periodicity question 2

[Maximum number: 3]

The Group 17 elements are oxidising agents.

Question (a)

(a)

Write an equation to show the reaction in which Cl2\mathrm{Cl}_{2} oxidises aluminium metal.

[ 1 ]

Question (b)

(b)

Table 1.3 gives some information about MgCl2\mathrm{MgCl}_{2} and SiCl4\mathrm{SiCl}_{4}.

Table 1.3

Table 1.3

[ 2 ]

Question (i)

(i)

Suggest the pH of the solutions that form when each chloride is added to water.
MgCl2\mathrm{MgCl}_{2}SiCl4\mathrm{SiCl}_{4}

[ 2 ]

9. The Periodic Table: chemical periodicity question 3

[Maximum number: 1]

The element astatine, At, is below iodine in Group 17 of the Periodic Table.
Which statements concerning At are likely to be correct?

1 It is a dark-coloured solid at room temperature.
2 It is a more powerful oxidising agent than iodine.
3 Its hydride is more thermally stable than HBr .

A

1, 2 and 3 are correct

B

1 and 2 only are correct

C

2 and 3 only are correct

D

1 only is correct

9. The Periodic Table: chemical periodicity question 4

[Maximum number: 8]

The table gives some data for elements in the third period and some of their compounds.

Table for Question 9. The Periodic Table: chemical periodicity question 4 — CAIE A-Level Chemistry AS

Question (a)

(a)

Complete the table to show the bonding in the elements, and the formulae of their oxides and chlorides.

[ 3 ]

Question (b)

(b)

On the axes, sketch the trend in melting point of the elements Na to S .

Figure for Question (b) — CAIE A-Level Chemistry AS
[ 1 ]

Question (c)

(c)

Give three statements to explain your sketch.

1
2
3

[ 3 ]

Question (d)

(d)

Write an equation for the reaction of P4O10\mathrm{P}_{4} \mathrm{O}_{10} with water.

[ 1 ]
All question bank results loaded