Unit 1.2

• What is the main reduction reaction in the blast furnace?

  Carbon monoxide reduces iron(III) oxide: CO + Fe2O3 → Fe + CO2
• Write the cathode equation for molten lead(II) bromide.

  Pb2 (positive) + 2e(negative) → Pb
• Write the anode equation for molten lead(II) bromide.

  2Br (negative) → Br2 + 2e (negative)
• What are the electrode reactions in aluminium extraction?

  Cathode: Al3 (positive) + 3e (negative) → Al; Anode: 2O2 (negative) → O2 + 4e (negative)
• What are the charges of ions formed by Fe and Cu in transition metals?

  Fe2 (positive), Fe3 (positive), Cu2 (negative)
• What are the electrode equations for water electrolysis?

  Cathode: 2H (positive) + 2e (negative) → H2; Anode: 4OH (negative) → O2 + 2H2O + 4e (positive)
• What happens at each electrode during electrolysis of aqueous copper(II) chloride?

  Cathode: Cu2 (positive) + 2e (negative) → Cu; Anode: 2Cl (negative)→ Cl2 + 2e (negative)
• During electrolysis of NaCl(aq), which ions are discharged?

  Cathode: H (positive) → H2; Anode: Cl (negative) → Cl2