Last updated on Oct 23, 2026

Reaction with Oxygen (AQA A-Level Chemistry): Flashcards

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Reaction with Oxygen

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Flame colour when $Na$ reacts with $O_2$

Bright yellow flame

pH of $Na_2O$ in water

Strongly alkaline, pH 13-14

Observation when $Mg$ reacts with $O_2$

Bright white light, vigorous reaction

pH of $MgO$ in water

Weakly alkaline, pH 9-10

Property of $Al_2O_3$ with acids/bases

Amphoteric

How $P$ reacts with $O_2$

Combusts spontaneously, very bright white flame

pH of $P_4O_{10}$ in water

Strongly acidic, pH 1-2

Flame colour when $S$ burns in $O_2$

Blue flame

Catalyst for $2SO_2 + O_2 \rightarrow 2SO_3$

Vanadium(V) oxide

pH of $SO_3$ in water

Highly acidic, pH 1

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