The group 2 elements react with water to form alkaline hydroxides with the general formula M(OH)2 and hydrogen gas. Magnesium reacts very slowly with cold water but the reactivity increases down the group.Mg(s) + 2H2O(l) → Mg(OH)2(aq) +H2(g) Magnesium reacts rapidly with steam to form magnesium oxide.Mg(s) + H2O(g) → MgO(s) + H2(g)
Group 2 Redox Reactions with Water
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Specification: OCR Chemistry A (H032), AS-level, 3.1.2 Group 2. Topic: Reactivity Trends.
Key terms in this lesson
- Group
- A vertical column of the periodic table, containing elements with the same number of outer-shell electrons.
More in Reactivity Trends
- Group 2 elements as Reducing Agents
- Group 2 Redox Reactions with Oxygen
- Group 2 Redox Reactions with Dilute Acids
- Group 2 Reactivity and Ionisation Energy
- Reactions of Group 2 Oxides
- Solubility of Group 2 Hydroxides
- Uses of Group 2 Compounds
- Group 7 Halogens Trends in Boiling Points
All 16 lessons in Reactivity Trends · All OCR AS-level Chemistry topics