Only liquids that contain moving ions can be electrolysed. These liquids are called electrolytes. (a) Complete the following table which shows the products formed when some liquids are electrolysed using inert graphite electrodes. [Table with three rows for different electrolytes: aqueous copper(II) sulfate (ions: Cu2+, H+, OH- and SO42-), concentrated aqueous sodium chloride (ions: H+, Na+, Cl- and OH-), molten lead(II) bromide (ions: Pb2+ and Br-). Columns for 'electrolyte', 'ions present in electrolyte', 'product formed at the positive electrode', 'product formed at the negative electrode'.]

1. (a)Complete the following table which shows the products formed when some liquids are electrolysed using inert graphite electrodes. | electrolyte | ions present in electrolyte | product formed at the positive electrode | product formed at the negative electrode | |---|---|---|---| | aqueous copper(II) sulfate | Cu2+, H+, OH- and SO42- | | | | concentrated aqueous sodium chloride | H+, Na+, Cl- and OH- | chlorine | hydrogen | | molten lead(II) bromide | Pb2+ and Br- | | | [3][3]
2. (b)(i)When concentrated aqueous sodium chloride is electrolysed, chlorine is formed at the positive electrode (anode) and hydrogen at the negative electrode (cathode). Construct the ionic equation to show the formation of chlorine at the positive electrode. .[1][1]
3. (b)(ii)Explain why hydrogen is formed at the negative electrode rather than sodium. .[1][1]
4. (c)Name a metal manufactured by the electrolysis of a molten ionic compound. .[1][1]

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