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Halogens and halide ions

Periodicity and main group chemistry · Lesson 3 of 5

Lesson 3 of 5

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Lesson 3 of 5 · Periodicity and main group chemistry

Halogens and halide ions

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Describe and explain the trends in colour, physical state, melting point, boiling point and oxidising ability of the halogens down Group 17.
Explain the decreasing reactivity of the halogens down the group in terms of atomic radius, shielding and attraction for an incoming electron, and relate this to electron affinity where appropriate.
Predict and write ionic equations for displacement reactions of halogens with aqueous halide ions, and identify the oxidising agent and reducing agent.

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Describe and explain the trends in reducing power of halide ions, including their reactions with concentrated sulfuric acid and the differing redox behaviour of $\text{Cl}^-$, $\text{Br}^-$ and $\text{I}^-$.

Apply the chemistry of halogens and halides to qualitative analysis, including tests with silver nitrate and ammonia for halide ions, and interpretation of practical observations in aqueous and organic layers.

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