This question is about the reactivity of metals.
A metal is heated with the oxide of a different metal. The table shows the results of two experiments.
| Mixture | Result |
|---|---|
| iron + nickel(II) oxide | reaction |
| iron + calcium oxide | no reaction |
Explain how these results show the order of reactivity of calcium, nickel, and iron.
The reaction between aluminium powder and manganese(IV) oxide powder can be used to produce manganese metal.
The word equation for the reaction that occurs is:
aluminium+manganese(IV) oxide→aluminium oxide+manganese \text{aluminium} + \text{manganese(IV) oxide} \rightarrow \text{aluminium oxide} + \text{manganese} aluminium+manganese(IV) oxide→aluminium oxide+manganeseWrite a chemical equation for this reaction.
Explain which substance is oxidised in this reaction.
Explain why aluminium and manganese(IV) oxide are used in powdered form rather than in large pieces.
