Chemical properties of halogens

Chemical properties of halogens. I have also made revision cards on the physical properties of halogens.

OCR Salters B F332

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Fluorine

Relative reactivity:

  • Most reactive

Halide ions and silver ions:

  • N/A

Displacement reactions:

  • Displaces chlorine, bromine and iodine
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Chlorine

Relative reactivity:

  • More reactive than bromine or iodine
  • Less reactive than fluorine

Halide ions and silver ions:

  • White precipitate of silver chloride

Displacement reactions:

  • Displaces bromine and iodine
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Bromine

Relative reactivity:

  • More reactive than iodine
  • Less reactive than fluorine or chlorine

Halide ions and silver ions:

  • Cream precipitate of silver bromide

Displacement reactions:

  • Displaces iodine
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Iodine

Relative reactivity:

  • Least reactive

Halide ions and silver ions:

  • Yellow precipitate of silver iodide

Displacement reactions:

  • Does not displace fluorine, chlorine or bromine 
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Ionic equations of displacement reactions

Chlorine and bromine:

  • Cl2(aq) + 2Br-(aq)  ->  2Cl-(aq) + Br2(aq)

Chlorine and iodine:

  • Cl2(aq) + 2I-(aq)  ->  2Cl-(aq) + I2(aq)

Bromine and iodine:

  • Br2(aq) + 2I-(aq)  ->  2Br-(aq) + I2(aq)
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Redox reactions

Halogens are all reactive.

They are oxidising agents - they tend to remove electrons from other elements.

General ionic half equation:

  • X2 + 2e-  ->  2X-

Halogen oxidation state 0 is reduced to oxidation state -1.

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