Oxidation-Reduction (Redox) Reactions Practice Test

Aluminum metal reacts with aqueous copper(II) chloride to produce aqueous aluminum chloride and copper metal, as shown:

$\mathrm{2,Al(s) + 3,CuCl_2(aq) \rightarrow 2,AlCl_3(aq) + 3,Cu(s)}$

How many electrons are transferred per aluminum atom that reacts?

Hydrogen peroxide can react with iodide ions in acidic solution to produce iodine and water:

$\text{H}_2\text{O}_2(aq) + 2\text{I}^-(aq) + 2\text{H}^+(aq) \rightarrow \text{I}_2(aq) + 2\text{H}_2\text{O}(l)$

Which species is reduced?