3.2.4
Period 3 Elements
and Their Oxides
Section 3.2.4 follows the elements sodium to sulfur across Period 3: how sodium and magnesium react with water, how each element burns in oxygen to its highest oxide, why the melting points of those oxides fall from the ionic lattices of Na₂O and MgO through giant covalent SiO₂ to the simple molecules P₄O₁₀, SO₂ and SO₃, and how each oxide behaves with water, acids and bases, including the structures of the acids and anions that the non-metal oxides form. Three pages take the trend from the elements to the acid-base chemistry.
Revision Notes
3 revision notes, in the order the specification teaches them.
Reactions of Period 3 Elements with Oxygen and Water
The reactions of Period 3 elements with oxygen and water: equations, observations and trends.
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Period 3 Oxides: Structure, Bonding and Melting Points
The structures and bonding of the Period 3 oxides and the trend in their melting points.
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Period 3 Oxides with Water, Acids and Bases
The reactions of Period 3 oxides with water, acids and bases, the pH of the solutions and the trend from basic to acidic oxides.
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Period 3 Elements and Oxides Map
AQA A-level Chemistry · 3.2.4 Properties of Period 3 elements and their oxides
All of 3.2.4 on one A4 page: reactions with water and oxygen, bonding and melting points, oxides with water, acids and bases.
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3.2.4
- iii
explain the trend in the melting point of the highest oxides of the elements Na-S in terms of their structure and bonding
Revise - v
know the structures of the acids and the anions formed when P4O10, SO2 and SO3 react with water
Revise - vi
explain the trends in the reactions of the oxides with water in terms of the type of bonding present in each oxide
Revise
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