State three further physical properties of iron.
State in which test-tube, M, N, O or P, the iron nail is most likely to rust.
From the list, choose the compound present in rust. Tick ($\checkmark$) one box. anhydrous iron(III) oxide anhydrous iron(III) sulfate hydrated iron(III) chloride hydrated iron(III) oxide
State one more reason copper is used for electrical wiring.
When copper(II) oxide reacts with hydrochloric acid, complete the word equation for this reaction: copper(II) oxide + hydrochloric acid → [BLANK] + [BLANK].
Copper can be made by heating copper(II) oxide in hydrogen. $\text{CuO} + \text{H}_2 \rightarrow \text{Cu} + \text{H}_2\text{O}$. Describe how this equation shows that copper(II) oxide is reduced.
The list shows five metals: aluminium, copper, gold, magnesium, potassium. Arrange these metals in order of reactivity. Put the most reactive metal at the top.