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Answers 1) What would the products be when aluminium chloride (which contains Al3+ and Cl- ions) is melted and electrolysed ? Write half equations to show what goes on at each electrode. Aluminium would be produced at the cathode: Al3+ + 3e- Al Chlorine would be produced at the anode: 2Cl- Cl2 + 2e- 2) Explain the following observations: When lead(II) bromide is heated until it melts and an electric current passed through, a silvery coloured liquid is found under the negative electrode (cathode) and a brown gas appears at the positive electrode (anode). Use half equations to support your answer. Molten lead forms under the cathode: Pb2+ + 2e- Pb Bromine is given off at the anode: 2Br- Br2 + 2e- 3) What would you observe during electrolysis of (i) silver nitrate solution; (ii) magnesium iodide solution? Give relevant half equations. Silver would be deposited on the cathode: Oxygen would be given off at the anode: Ag+ + e- Ag 4OH- O2 + 2H2O + 2e- Hydrogen would be produced at the cathode: Iodine would be formed at the anode: 2H+ + 2e- H2 2I- I2 + 2e-PDF Image | Electrolysis is using an electric current
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