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CAIE A-Level Chemistry AS 9.2 Periodicity of Chemical Properties of the Elements in Period 3 Questions

Practise equations and explanations for Period 3 elements, oxides and chlorides, including acid–base behaviour.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • write balanced reactions of selected Period 3 elements with oxygen, chlorine and water
  • track maximum oxidation number across specified oxides and chlorides using valence electrons
  • explain oxide and chloride reactions with water, acids or bases through bonding and electronegativity

Covered syllabus points

9.2.1—Reactions of the elements with oxygen (to9.2.2—The variation in the oxidation number9.2.3—Reactions/equations: the reactions, if any,9.2.4—Reactions/equations: the acid / base behaviour9.2.5—Reactions of the chlorides NaCl, MgCl2, Al9.2.6—Variations and trends in 9.2.2, 9.2.3, 9.2.49.2.7—Suggest the types of chemical bonding present

Question 1

[Maximum number: 1]

Aluminium, silicon and phosphorus are elements in Period 3 of the Periodic Table. Each element forms an oxide.

Which row is correct?

Al2O3\mathrm{Al}_{2} \mathrm{O}_{3}

SiO2\mathrm{SiO}_{2}

P4O10\mathrm{P}_{4} \mathrm{O}_{10}

basic

amphoteric

acidic

giant ionic

giant ionic

simple molecular

high melting point

high melting point

low melting point

vigorous reaction with water

slight reaction with water

vigorous reaction with water

Question 2

[Maximum number: 1]

In reactions 1 and 2, X represents an element in Period 3.
In each reaction, X is forming a product where X is in its highest oxidation state.

reaction 1 chlorine + element X→XyClz\mathrm{X} \rightarrow \mathrm{X}_{\mathrm{y}} \mathrm{Cl}_{\mathrm{z}}

reaction 2 oxygen + element X→XpOqX \rightarrow X_{p} O_{q}

Which ratios show a steady increase from sodium to phosphorus?

A

neither z: y nor q: p

B

z: y only

C

q :p only

D

both z: y and q: p

Question 3

[Maximum number: 1]

Element X is in Period 3. Element X reacts with oxygen to produce a solid, Y.
When solid Y is added to water, a solution with a pH of less than 7 is produced.
What is the identity of element X ?

A

sodium

B

silicon

C

phosphorus

D

sulfur

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