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IGCSE Chemistry1.48 Molecular mass and boiling pointTopic Practice

1.48 Molecular mass and boiling point

Explain why the melting and boiling points of substances with simple molecular structures increase, in general, with increasing relative molecular mass

Question 2(c)

[Maximum number: 1]

The table gives some information about five gases.

Table

Why does chlorine have the highest boiling point of the gases in the table?

A

chlorine has the strongest covalent bonds between its atoms

B

chlorine has the strongest covalent bonds between its molecules □ C chlorine has the strongest ionic bonds between its atoms □ D chlorine has the strongest forces of attraction between its molecules □ □

C

chlorine has the strongest ionic bonds between its atoms

D

chlorine has the strongest forces of attraction between its molecules

Question 5(d)

[Maximum number: 3]

Butane (C4H10)\left(\mathrm{C}_{4} \mathrm{H}_{10}\right) is an alkane.

Explain why hexane (C6H14)\left(\mathrm{C}_{6} \mathrm{H}_{14}\right) has a higher boiling point than butane (C4H10)\left(\mathrm{C}_{4} \mathrm{H}_{10}\right).

Question 10

[Maximum number: 5]

This question is about alkanes.

Question 10(a)

(a)

The graph shows the boiling points of several unbranched alkanes.

Question image
[ 5 ]

Question 10(a)(ii)

(i)

Use the graph to find the boiling point of the alkane with 7 carbon atoms in its molecule.

Show on the graph how you obtain your answer.
boiling point = ∘C{ }^{\circ} \mathrm{C}

[ 2 ]

Question 10(a)(iii)

(ii)

Explain the trend shown by the graph.

[ 3 ]

Question 9(b)

[Maximum number: 3]

This question is about substances that contain covalent bonds.

The table shows the boiling points of three Group 7 elements.

Table

Explain the trend in the boiling points.

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