AQA · Year 13
AQA Period 3 Oxide Questions
Work with oxide structures, water reactions, acid–base behaviour and balanced equations, including aluminium oxide and silicon dioxide.
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An oxide can be acidic without reacting with water. Silicon dioxide reacts with bases but not with water. Aluminium oxide is amphoteric: it reacts with both acids and bases. Compare oxide structures when explaining melting points.
A worked example
Al₂O₃ + 6H⁺ → 2Al³⁺ + 3H₂O shows reaction with an acid. Al₂O₃ + 2OH⁻ + 3H₂O → 2[Al(OH)₄]⁻ shows reaction with aqueous base.