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Atomic and physical properties . . .
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Discusses trends in atomic radius, electronegativity, electron affinity and melting and boiling points of the Group 7 elements. It also looks at the bond strengths of halogen-halogen bonds and of hydrogen-halogen bonds.
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Halogens as oxidising agents . . .
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Describes and explains the trend in oxidising ability of the Group 7 elements based on the reactions between one halogen and the ions of another one - for example, between Cl2 and I- ions from salts like KI.
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The acidity of the hydrogen halides . . .
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Discusses the acidity of the hydrogen halides (like hydrogen chloride), and explains why HF is a weak acid.
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Halide ions as reducing agents . . .
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Describes and explains the trend in reducing ability of the halide ions based on their reactions with concentrated sulphuric acid.
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Testing for halide ions . . .
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Describes and explains the tests for halide ions using silver nitrate solution followed by ammonia solution.
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The manufacture of chlorine . . .
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Describes the manufacture of chlorine by the electrolysis of sodium chloride solution using a diaphragm cell and a membrane cell.