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Edexcel IGCSE Chemistry B Group 7 Halogens Chlorine Bromine and Iodine Questions

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

Syllabus
First assessment 2019
Course
Chemistry 4CH1

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 states2.6 Predicting halogen properties2.7 Halogen displacement reactions2.8C Group 7 electronic configurations

Question 1

[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 1 — Edexcel IGCSE Chemistry

Question (a)

(a)

Predict the colour of fluorine at room temperature.

[ 1 ]

Question (b)

(b)

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

A

0

B

1

C

2

D

3

[ 1 ]

Question (c)

(c)

The element astatine is below iodine in Group 7.

Predict the formula of a molecule of astatine.

[ 1 ]

Question (d)

(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

Cl2( g)+2Br−(aq)→2Cl−(aq)+Br2(aq)\mathrm{Cl}_{2}(\mathrm{~g})+2 \mathrm{Br}^{-}(\mathrm{aq}) \rightarrow 2 \mathrm{Cl}^{-}(\mathrm{aq})+\mathrm{Br}_{2}(\mathrm{aq})
[ 3 ]

Question (i)

(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 ]

Question 2

[Maximum number: 4]

This question is about Group 7, the halogens.

Question (a)

(a)

Which of these describes the element iodine at room temperature?

A

brown liquid

B

brown solid

C

grey solid

D

purple gas

[ 1 ]

Question (b)

(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 ]

Question 3

[Maximum number: 1]

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

Table for Question 3 — Edexcel IGCSE Chemistry

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

A

0

B

1

C

2

D

3

Question 4

[Maximum number: 3]

This question is about Group 7, the halogens.

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 4 — Edexcel IGCSE Chemistry

Question 5

[Maximum number: 3]

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

Table for Question 5 — Edexcel IGCSE Chemistry

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

Cl2( g)+2Br−(aq)→2Cl−(aq)+Br2(aq)\mathrm{Cl}_{2}(\mathrm{~g})+2 \mathrm{Br}^{-}(\mathrm{aq}) \rightarrow 2 \mathrm{Cl}^{-}(\mathrm{aq})+\mathrm{Br}_{2}(\mathrm{aq})

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.

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