Trends in properties (3.2.3.1) | AQA A-level Chemistry - (7405) | KnowledgeSet

Trends in properties

Chemistry · A-Level · AQA · AQA A-level Chemistry - (7405) · Specification point · 3.2.3.1 · Inorganic chemistry · Group 7(17), the halogens

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3.2.3.1 Trends in properties

Content	Opportunities for skills development
$The trends in electronegativity and boiling point of the halogens. Students should be able to: explain the trend in electronegativity explain the trend in the boiling point of the elements in terms of their structure and bonding. The trend in oxidising ability of the halogens down the group, including displacement reactions of halide ions in aqueous solution. The trend in reducing ability of the halide ions, including the reactions of solid sodium halides with concentrated sulfuric acid. The use of acidified silver nitrate solution to identify and distinguish between halide ions. The trend in solubility of the silver halides in ammonia. Students should be able to explain why: silver nitrate solution is used to identify halide ions the silver nitrate solution is acidified ammonia solution is added.$	$AT d and k PS 2.2 Students could carry out test-tube reactions of solutions of the halogens (Cl₂, Br₂, I₂) with solutions containing their halide ions (eg KCl, KBr, KI).$

Content

Opportunities for skills development

The trends in electronegativity and boiling point of the halogens. Students should be able to: explain the trend in electronegativity explain the trend in the boiling point of the elements in terms of their structure and bonding. The trend in oxidising ability of the halogens down the group, including displacement reactions of halide ions in aqueous solution. The trend in reducing ability of the halide ions, including the reactions of solid sodium halides with concentrated sulfuric acid. The use of acidified silver nitrate solution to identify and distinguish between halide ions. The trend in solubility of the silver halides in ammonia. Students should be able to explain why: silver nitrate solution is used to identify halide ions the silver nitrate solution is acidified ammonia solution is added.

AT d and k PS 2.2 Students could carry out test-tube reactions of solutions of the halogens (Cl₂, Br₂, I₂) with solutions containing their halide ions (eg KCl, KBr, KI).