Group 2, the alkaline earth metals (3.2.2) | AQA A-level Chemistry - (7405) | KnowledgeSet

Group 2, the alkaline earth metals

Chemistry · A-Level · AQA · AQA A-level Chemistry - (7405) · Specification point · 3.2.2 · Inorganic chemistry

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3.2.2 Group 2, the alkaline earth metals

The elements in Group 2 are called the alkaline earth metals. The trends in the solubilities of the hydroxides and the sulfates of these elements are linked to their use. Barium sulfate, magnesium hydroxide and magnesium sulfate have applications in medicines whilst calcium hydroxide is used in agriculture to change soil pH, which is essential for good crop production and maintaining the food supply.

Content	Opportunities for skills development
$The trends in atomic radius, first ionisation energy and melting point of the elements Mg-Ba Students should be able to: explain the trends in atomic radius and first ionisation energy explain the melting point of the elements in terms of their structure and bonding. The reactions of the elements Mg-Ba with water. The use of magnesium in the extraction of titanium from TiCl₄ The relative solubilities of the hydroxides of the elements Mg-Ba in water. Mg(OH)₂ is sparingly soluble. The use of Mg(OH)₂ in medicine and of Ca(OH)₂ in agriculture. The use of CaO or CaCO₃ to remove SO₂ from flue gases. The relative solubilities of the sulfates of the elements Mg-Ba in water. BaSO₄ is insoluble. The use of acidified BaCl₂ solution to test for sulfate ions. The use of BaSO₄ in medicine.$

Content

Opportunities for skills development

The trends in atomic radius, first ionisation energy and melting point of the elements Mg-Ba Students should be able to: explain the trends in atomic radius and first ionisation energy explain the melting point of the elements in terms of their structure and bonding. The reactions of the elements Mg-Ba with water. The use of magnesium in the extraction of titanium from TiCl₄ The relative solubilities of the hydroxides of the elements Mg-Ba in water. Mg(OH)₂ is sparingly soluble. The use of Mg(OH)₂ in medicine and of Ca(OH)₂ in agriculture. The use of CaO or CaCO₃ to remove SO₂ from flue gases. The relative solubilities of the sulfates of the elements Mg-Ba in water. BaSO₄ is insoluble. The use of acidified BaCl₂ solution to test for sulfate ions. The use of BaSO₄ in medicine.