CAIE IGCSE Chemistry 2.5 Simple Molecules and Covalent Bonds Topic Practice

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Covered syllabus points

2.5.1—Covalent bond is formed when a pair of2.5.2—Formation of covalent bonds in simple2.5.3—Simple molecular compound properties2.5.4—Formation of covalent bonds in simple2.5.5—Simple molecular compound properties

Question 1

[Maximum number: 2]

The elements in Group VII of the Periodic Table are known as the halogens. Halogens can form halide ions.

Bromine molecules have covalent bonding.

State what is meant by the term covalent bond.

Question 2

[Maximum number: 2]

This question is about the elements sodium and fluorine and the compound sodium fluoride.

Some properties of sodium, fluorine and sodium fluoride are shown in Table 3.1.

Table 3.1

Table 3.1

Complete the dot-and-cross diagram in Fig. 3.1 of a molecule of fluorine.

Show outer shell electrons only.

Fig. 3.1

Fig. 3.1

Question 3

[Maximum number: 1]

Which substance has the lowest melting point?

A

graphite

B

methanol

C

silicon(IV) oxide

D

sodium chloride

Question 4

[Maximum number: 1]

How many electrons are shared in one molecule of nitrogen and in one molecule of ethene?

nitrogen

ethene

2

12

2

8

6

12

6

8

Question 5

[Maximum number: 1]

Which statement describes the attractive forces between molecules?

A

They are strong covalent bonds which hold molecules together.

B

They are strong ionic bonds which hold molecules together.

C

They are weak forces formed between covalently-bonded molecules.

D

They are weak forces which hold ions together in a lattice.

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