A chemistry teacher in Jamaica demonstrated the thermit reaction between aluminium powder and iron(III) oxide. The reaction produced molten iron and another product. Which statement explains why this reaction occurs?

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Question

A chemistry teacher in Jamaica demonstrated the thermit reaction between aluminium powder and iron(III) oxide. The reaction produced molten iron and another product. Which statement explains why this reaction occurs?

Accepted Answer

Aluminium is more reactive than iron — Award 1 mark for correct explanation. The more reactive aluminium displaces the less reactive iron from its oxide: 2Al + Fe₂O₃ → Al₂O₃ + 2Fe. A is incorrect — if iron were more reactive, no displacement would occur. C is incorrect — different reactivities drive the reaction. D is incorrect — the thermit reaction is highly exothermic and self-sustaining once ignited.

Answer

Both metals have the same reactivity

Answer

The reaction requires an electric current

Answer

Aluminium is more reactive than iron

Answer

Iron is more reactive than aluminium

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