Learners' AlleyDesigned by Khow Willard

Chemical Bonding and Structure

Set AConcept Practice

Name

Time 50 minutes

Total 43 marks

From the lesson

26 marks

What is the formula of aluminium sulfate?

AAlSO₄

BAl₂SO₄

CAl₂(SO₄)₃

DAl₃(SO₄)₂

Answer [1]

Learners' Alley, Bonding and Structure slides

Which compound has the highest melting point?

ANaCl

BMgO

CKCl

DNaBr

Answer [1]

Learners' Alley, Bonding and Structure slides

How many σ and π bonds are in one molecule of ethene, H₂C=CH₂?

A4 σ, 2 π

B5 σ, 1 π

C6 σ, 0 π

D4 σ, 1 π

Answer [1]

Learners' Alley, Bonding and Structure slides

Which molecule is polar?

ACCl₄

BBF₃

CCO₂

DCHCl₃

Answer [1]

Learners' Alley, Bonding and Structure slides

Which has the highest boiling point?

ACH₄

BNH₃

CH₂O

DHF

Answer [1]

Learners' Alley, Bonding and Structure slides

(a)

Use the Periodic Table to give the number of shells and of valence electrons in a magnesium atom.

[1]

(b)

Do the same for a sulfur atom.

[1]

(c)

Does a calcium atom reach an octet more easily by losing or by gaining electrons? Explain.

[2]

Learners' Alley, Chemical Bonding and Structure slides

Write the formulae of potassium oxide, iron(III) chloride and ammonium sulfate.

[3]

Learners' Alley, Chemical Bonding and Structure slides

Which has the higher melting point, NaF or CsCl? Explain.

[2]

Learners' Alley, Chemical Bonding and Structure slides

Draw dot-and-cross diagrams for these molecules. Show outer electrons only.

(a)

H₂O

[1]

(b)

N₂

[1]

Learners' Alley, Chemical Bonding and Structure slides

State the shape and bond angle of each molecule.

(a)

BF₃

[1]

(b)

H₂O

[1]

(c)

SF₆

[1]

(d)

XeF₄

[1]

Learners' Alley, Chemical Bonding and Structure slides

(a)

Which bond is more polar, C–Cl or C–F? Explain.

[1]

(b)

Why is CCl₄ non-polar although its bonds are polar?

[1]

Learners' Alley, Chemical Bonding and Structure slides

(a)

Which of CH₄, CH₃OH, HCl and NH₃ form hydrogen bonds between their own molecules?

[1]

(b)

Put Cl₂, Br₂ and I₂ in order of increasing boiling point. Explain.

[1]

Learners' Alley, Chemical Bonding and Structure slides

Explain why SiO₂ melts at 1710 °C but CO₂ is a gas at room temperature.

[2]

Learners' Alley, Chemical Bonding and Structure slides

Practice

17 marks

Sodium is a grey solid. Chlorine is a yellowish-green gas. When sodium is heated and mixed with chlorine, a reaction takes place and a white crystalline substance called sodium chloride is formed. Which statement about sodium chloride is correct?

AIt is a compound of sodium and chlorine.

BIt is a mixture of sodium and chlorine.

CIt is a new element.

DIt is an alloy of sodium and chlorine.

Answer [1]

2024 Zhenghua O Prelim P1-P3 Q8

The electronic configurations of three particles, X, Y and Z, are shown.

particle	electronic configuration
X	2.1
Y	1
Z	2.8.7

Which statement is true about these three particles?

AX forms covalent bonds with Z.

BX forms ionic bonds with Y.

CY can only form ionic bonds.

DY forms ionic bonds with Z.

Answer [1]

2025 FHSS O Prelim P1 Q8

Elements X and Y react to form an ionic compound of formula XY₂. Which row correctly shows the electronic configurations of atoms X and Y? Each option gives X, then Y.

AX 2.1, Y 2.5

BX 2.4, Y 2.6

CX 2.8.1, Y 2.8.6

DX 2.8.8.2, Y 2.8.7

Answer [1]

2025 CHIJ O Prelim P1 Q6

The electronic configurations of elements X and Y are X: 2.8.3 and Y: 2.6. Element X and element Y react together to form a compound. Which row shows the electron transfer that takes place and the type of compound formed?

	element X	element Y	type of compound
A	2 atoms each lose 3 electrons	3 atoms each receive 2 electrons	covalent
B	2 atoms each lose 3 electrons	3 atoms each receive 2 electrons	ionic
C	2 atoms each receive 3 electrons	3 atoms each lose 2 electrons	covalent
D	2 atoms each receive 3 electrons	3 atoms each receive 2 electrons	ionic

Arow A

Brow B

Crow C

Drow D

Answer [1]

2024 SKSS O Prelim P1 Q7

Which statement best explains why potassium chloride has a lower melting point than calcium oxide?

APotassium chloride is a covalent compound but calcium oxide is an ionic compound.

BPotassium is more reactive than calcium.

CThe forces of attraction between K⁺ and Cl⁻ are weaker than those between Ca²⁺ and O²⁻.

DThe melting point of potassium is lower than that of calcium.

Answer [1]

2025 Compassvale O Prelim P1 Q12

Both calcium chloride and potassium chloride are ionic compounds. Which statement about these compounds is correct?

APotassium chloride has a higher melting point than calcium chloride because the potassium ion has a greater charge than the calcium ion.

BCalcium chloride and potassium chloride conduct electricity because positive and negative ions flow through the solid material.

CMolten calcium chloride has a greater electrical conductivity than molten potassium chloride because calcium contributes more electrons to the delocalised ‘sea of electrons’ than potassium.

DIn the calcium chloride lattice, the ratio of calcium ions to chloride ions is half that of the ratio of potassium ions to chloride ions in the potassium chloride lattice.

Answer [1]

2024 USS O Prelim P2 Q7

The table shows four elements P, Q, R and S with their atomic numbers.

element	P	Q	R	S
atomic number	6	12	13	8

What are the likely formulae of an ionic compound and a covalent compound formed from P, Q, R and S? Each option gives the ionic compound, then the covalent compound.

AQS₂, Q₂P

BQ₃R₂, R₂S₃

CR₂S₃, PS₂

DS₂, Q₂P

Answer [1]

2024 Zhonghua O Prelim P1 Q9

What is the number of electrons and neutrons in a hydroxide ion? Each option gives the electrons, then the neutrons.

A9 electrons, 8 neutrons

B9 electrons, 9 neutrons

C10 electrons, 8 neutrons

D10 electrons, 9 neutrons

Answer [1]

Source: 2024 SJI O Prelim P1 Q4

Which substance contains both ionic and covalent bonds?

Aammonium chloride

Bhydrogen chloride

Clithium oxide

Dsilicon dioxide

Answer [1]

2025 CCHY O Prelim P1 Q11

A substance Y

has a high melting point
is a good conductor of electricity
is malleable.

What could Y be?

Agraphite

Biron

Cpotassium chloride

Dsilicon dioxide

Answer [1]

2025 CCHY O Prelim P1 Q12

Brass is an alloy made by adding zinc to copper. Brass is harder than pure copper, and the higher the percentage of zinc in the brass, the harder it is. Which statement best explains why brass is harder than pure copper?

AThe copper atoms are bonded strongly to the valence electrons of zinc atoms.

BThe copper atoms form strong metallic bonds with zinc atoms in brass.

CThe zinc atoms are bonded strongly to the ‘sea of electrons’ and prevent the electrons from moving freely in the lattice.

DThe zinc atoms disrupt the orderly arrangement of copper atoms and prevent the layers of copper atoms from sliding over one another easily.

Answer [1]

2024 Zhonghua O Prelim P1 Q25

Which statement about metals is correct?

AA giant metallic lattice consists of metal atoms in a ‘sea of electrons’.

BAll metals have high melting points.

CElectrons in a metal move randomly through the giant metallic lattice.

DMetals are malleable as the atoms in a metal are mobile.

Answer [1]

2024 SJI O Prelim P1 Q8

Which row shows the correct number of electrons used in covalent bonding in each molecule?

	ammonia	carbon dioxide	fluorine	nitrogen
A	6	4	2	4
B	6	8	2	6
C	6	4	2	6
D	6	8	2	4

Arow A

Brow B

Crow C

Drow D

Answer [1]

2025 Compassvale O Prelim P1 Q11

Silicon dioxide has a giant covalent structure. Each silicon atom is joined to four oxygen atoms by covalent bonds. Which property would silicon dioxide be expected to have?

Aa good conductor of electricity

Ba high melting point

Creacts with dilute hydrochloric acid

Dsoluble in water

Answer [1]

2026 KSS O Prelim P1 Q11

At room temperature and pressure, carbon dioxide is a gas while silicon dioxide is a solid. Which statement explains this?

AAttractive forces between carbon dioxide molecules are weaker than the attractive forces between ions in silicon dioxide.

BBoth substances have different covalent structures.

CThe covalent bonds in carbon dioxide are weaker than those in silicon dioxide.

DThere are fewer covalent bonds in carbon dioxide than in silicon dioxide.

Answer [1]

2024 SJI O Prelim P1 Q9

Which two substances have similar three-dimensional arrangements of their atoms?

Adiamond and silicon dioxide

Bgraphite and diamond

Ccarbon dioxide and graphite

Dsilicon dioxide and carbon dioxide

Answer [1]

2024 YSS O Prelim P1 Q8

Which structure corresponds to its description of physical properties?

	structure	physical properties
1	giant covalent	high melting point, conducts electricity when in solution but not when solid
2	simple molecular	low melting point, does not conduct electricity in any state
3	giant metallic	variety of melting points, conducts electricity when solid and when molten

A1 and 2 only

B1 and 3 only

C2 and 3 only

D1, 2 and 3

Answer [1]

2025 TKGS O Prelim P1 Q9

The Periodic Table of Elements, from the A Level Chemistry Data Booklet (8873, 9476, 9813)