8.1.7

Halogen - Displacement Reactions

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Displacement Reactions - Halogens

More reactive substances can displace (replace) less reactive substances from compounds. For example, chlorine can displace bromine from a compound:

Illustrative background for Displacement reactionIllustrative background for Displacement reaction ?? "content

Displacement reaction

  • Sodium bromide + chlorine → sodium chloride + bromine.
  • 2NaBr + Cl2 → 2NaCl + Br2
Illustrative background for Bromide ions (Br<sup>-</sup>)Illustrative background for Bromide ions (Br<sup>-</sup>) ?? "content

Bromide ions (Br-)

  • Bromide ions are oxidised (electrons are lost):
    • 2Br- → Br2 +2e-.
Illustrative background for Chlorine (Cl<sub>2</sub>)Illustrative background for Chlorine (Cl<sub>2</sub>) ?? "content

Chlorine (Cl2)

  • Chlorine is reduced (electrons are gained):
    • Cl2 + 2e- → 2Cl-.
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Spectator ions

  • The sodium ions do not change in the reaction, so we call them spectator ions.

Jump to other topics

1States of Matter

2Elements, Compounds & Mixtures

3Atomic Structure

4The Periodic Table

5Chemical Formulae, Equations & Calculations

6Bonding

7Electrolysis

8Groups of the Periodic Table

9The Atmosphere

10Reactivity Series

11Metal Extraction

12Acids & Alkalis

13Chemical Tests

14Physical Chemistry

15Organic Chemistry

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