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 |
|---|---|
| zinc + copper(II) oxide | reaction |
| zinc + magnesium oxide | no reaction |
Explain how these results show the order of reactivity of magnesium, copper, and zinc.
The reaction between aluminium powder and chromium(III) oxide powder can be used to produce chromium metal.
The word equation for the reaction that occurs is:
aluminium+chromium(III) oxide→aluminium oxide+chromium \text{aluminium} + \text{chromium(III) oxide} \rightarrow \text{aluminium oxide} + \text{chromium} aluminium+chromium(III) oxide→aluminium oxide+chromiumWrite a chemical equation for this reaction.
Explain which substance is oxidised in this reaction.
Explain why aluminium and chromium(III) oxide are used in powdered form rather than in large pieces.
