O Level Pure Chemistry TYS Chemical Bonding

Question 1 of 27

1. Question

1 point(s)

A metal X and a non-metal Y react together to form an ionic compound X₂Y.

Which statement is correct when this compound is being formed?

Each atom of X gives away one electron only.
Each atom of X receives one electron only.
Each atom of Y gives away one electron only.
Each atom of Y receives one electron only.

Question 2 of 27

2. Question

1 point(s)

Which structure does not contain atoms bonded to other atoms by four covalent bonds?

diamond
graphite
poly(ethene)
sand (silicon dioxide)

Question 3 of 27

3. Question

1 point(s)

In which molecule are all the outer electrons of the atoms involved in bonding?

HF
H₂O
NH₃
CH₄

Question 4 of 27

4. Question

1 point(s)

The formation of metallic oxides involves the transfer of electrons from metal atoms to oxygen.

In the formation of one mole of which metallic oxide do the metal atoms not transfer exactly two moles of electrons?

aluminium oxide
iron(II) oxide
magnesium oxide
sodium oxide

Question 5 of 27

5. Question

1 point(s)

Solid copper metal, aqueous copper(II) sulfate, solid graphite and molten sodium chloride will all conduct electricity.

Which pair will conduct electricity because they both contain mobile ions?

aqueous copper(II) sulfate and molten sodium chloride
solid copper metal and aqueous copper(II) sulfate
solid copper metal and solid graphite
solid graphite and molten sodium chloride

Question 6 of 27

6. Question

1 point(s)

The diagram shows the structure of a compound of carbon and silicon, (SiCl)ₙ.

Which statement would be true for (SiCl)ₙ?

It acts as a lubricant.
It conducts electricity.
It is insoluble in water.
It has a low melting point.

Question 7 of 27

7. Question

1 point(s)

A compound contains two elements, metal Y and non-metal Z.

The compound consists of a lattice of positive ions and negative ions. Each positive ion is surrounded by eight negative ions and each negative ion is surrounded by four positive ions.

Which ions are present in the compound, and what is its formula?

A
B
C
D

Question 8 of 27

8. Question

1 point(s)

Which statement about the substance formed when a given mass of an element burns in excess oxygen is always correct?

The substance formed is

denser than the element.
greater in mass than the element.
soluble in water.
white in colour.

Question 9 of 27

9. Question

1 point(s)

Which row shows the substances in the order of their melting points?

A
B
C
D

Question 10 of 27

10. Question

1 point(s)

The table shows some properties of four substances.

Which substance has a structure held together by electrostatic forces of attraction between oppositely charged ions?

A
B
C
D

Question 11 of 27

11. Question

1 point(s)

In which compound does one of the atoms not achieve the electronic configuration 2,8?

CCl₄
CO₂
MgO
Na₂O

Question 12 of 27

12. Question

1 point(s)

Which particles are responsible for the conduction of electricity through metals?

electrons only
electrons and positive ions
negative ions only
negative ions and positive ions

Question 13 of 27

13. Question

1 point(s)

Covalent bonds are formed when atoms share electrons.

How many electrons are provided by each of the atoms of the elements oxygen, fluorine and carbon when they form covalent compounds?

A
B
C
D

Question 14 of 27

14. Question

1 point(s)

Oxygen crystals are obtained by freezing oxygen at -223°C.

What will the oxygen crystals contain?

oxygen atoms and molecules
oxygen ions and oxygen atoms
oxygen molecules only
oxygen atoms only

Question 15 of 27

15. Question

1 point(s)

Carbon disulfide, CS₂, is a covalent liquid.

Which is the dot-and-cross diagram for carbon disulfide?

Question 16 of 27

16. Question

1 point(s)

Which statements correctly describe the properties of mixtures of iron and sulfur, and the compound iron(II) sulfide, FeS?

1 only
1 and 2
2 and 3
3 only

Question 17 of 27

17. Question

1 point(s)

Which substance could be graphite?

A
B
C
D

Question 18 of 27

18. Question

1 point(s)

Which salt contains covalent bonds?

ammonium chloride
magnesium bromide
potassium iodide
sodium fluoride

Question 19 of 27

19. Question

1 point(s)

Phosphorus trichloride, PCl₃, is a molecule formed when the elements phosphorus (Group V) and chlorine (Group VII) react together.

How many electrons in the outer shell of the phosphorus atom are not involved in bonding?

0
1
2
3

Question 20 of 27

20. Question

1 point(s)

Which statements are correct for both metals and ionic compounds?

They conduct electricity because electrons flow through the solid material.
Most have high melting points.
They contain positive ions.

1, 2 and 3
1 and 2 only
1 and 3 only
2 and 3 only

Question 21 of 27

21. Question

1 point(s)

Which pair of elements combine together to form a covalent molecule?

aluminium and oxygen
carbon and sulfur
lithium and nitrogen
magnesium and sulfur

Question 22 of 27

22. Question

1 point(s)

A substance has a high melting point. When solid, it does not conduct electricity but when molten, it does conduct.

Which type of structure does the substance have?

giant lattice
metallic
polymeric
simple molecular

Question 23 of 27

23. Question

1 point(s)

How many covalent bonds are there in the molecule with the formula CH₂CHCH₃?

7
8
9
10

Question 24 of 27

24. Question

1 point(s)

Copper is a metal. The structure of copper is described as a lattice of positive ions in a ‘sea of electrons’.

Which statements about copper are correct?

Copper conducts heat because the positive ions are free to move.
Copper conducts electricity because the electrons are free to move.
Copper ions are held together because of their attraction for each other.
Copper has a high melting point due to the strong covalent bonds.

1, 2 and 3
2, 3 and 4
2 and 3 only
2 only

Question 25 of 27

25. Question

1 point(s)

Which property is common to both diamond and graphite?

Each atom in the structure forms four covalent bonds.
They act as a lubricant when finely divided.
They are electrical insulators.
They react with oxygen to produce carbon dioxide.

Question 26 of 27

26. Question

1 point(s)

Both calcium chloride and potassium chloride are ionic compounds.

Which statements about these compounds are correct?

Potassium chloride has a higher melting point than calcium chloride because the potassium ion has a greater charge than the calcium ion.
In 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.
Molten calcium chloride has a greater electrical conductivity than molten potassium chloride because calcium contributes more electrons to the delocalised ‘sea of electrons’ than does potassium.

1 and 2
1 and 3
2 only
3 only

Question 27 of 27

27. Question

1 point(s)

For which does 1 mole of the metal have the most electrons in its ‘sea of electrons’?

aluminium
barium
caesium
strontium

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