Halogens / Group 7

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  • Created by: SimranS
  • Created on: 14-05-16 20:03

Characteristic Physical Properties:

-diatomic molecules

-boiling point + melting point increases down group (stronger induced dipole-dipole forces)

Redox Reactions:

-gains 1 electron; forms 1- ions

-oxidising agent

Reactivity of halogens:

-less reactive down group

-atomic increases

-outer electrons shielded more

-halogens displace less reactive halides

Displacement reaction:

-Cl displaces Br & I

-Br displaces I

-I has no reaction

Test for halides:

1) Add dilute Nitric acid

2) Add Silver Nitrate solution (Aq)

-silver halide precipitate formed

-White = Cl-

-Cream = Br-


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