Edexcel IGCSE Chemistry: Group 7 Halogens Question Bank

Practise Group 7 colours, states, trends and displacement reactions for fluorine, chlorine, bromine and iodine.

Exam points

complete colour and room-temperature state data for the halogens
predict an unknown halogen property by extending the trend down Group 7
use displacement results and electron-shell attraction to explain the reactivity trend

Covered syllabus points

2.5 Halogen colours and states 2.6 Predicting halogen properties 2.7 Halogen displacement reactions 2.8C Group 7 electronic configurations

[Maximum number: 6]

This question is about elements in Group 7 and their compounds.
The table gives information about some of these elements.

Table for Question (b) Group 7 (halogens) – chlorine, bromine and iodine question 1 — Edexcel IGCSE Chemistry

(a)

Predict the colour of fluorine at room temperature.

[ 1 ]

(b)

How many of the elements in the table are liquids at room temperature $\left(20^{\circ} \mathrm{C}\right)$ ?

[ 1 ]

(c)

The element astatine is below iodine in Group 7.

Predict the formula of a molecule of astatine.

[ 1 ]

$\mathrm{At}_{2}$

(d)

Sea water contains bromide ions.

Bromine can be obtained by bubbling chlorine through a sample of sea water.
The ionic equation for the reaction is

\mathrm{Cl}_{2}(\mathrm{~g})+2 \mathrm{Br}^{-}(\mathrm{aq}) \rightarrow 2 \mathrm{Cl}^{-}(\mathrm{aq})+\mathrm{Br}_{2}(\mathrm{aq})

[ 3 ]

(i)

The reaction occurs because chlorine is more reactive than bromine.

Bromine is below chlorine in Group 7.
Explain the decrease in reactivity from chlorine to bromine.

[ 3 ]

[Maximum number: 4]

This question is about Group 7, the halogens.

(a)

Which of these describes the element iodine at room temperature?

brown liquid

brown solid

grey solid

purple gas

[ 1 ]

(b)

When a halogen is added to a solution containing halide ions, a displacement reaction may occur.

The table shows whether a reaction occurs.

Using information from the table, explain the order of reactivity of the three halogens.

Table for Question (b) — Edexcel IGCSE Chemistry

[ 3 ]

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Covered syllabus points

(b) Group 7 (halogens) – chlorine, bromine and iodine question 1

Question (a)

Question (b)

Question (c)

Question (d)

Question (i)

(b) Group 7 (halogens) – chlorine, bromine and iodine question 2

Question (a)

Question (b)