An experimental setup is prepared to investigate the electrolysis of different substances.
Name the particles that flow through the brass connecting wires to carry the electrical current.
The electrodes used in the investigation are made of platinum, which is an inert material. State what is meant by the term inert in this context.
Explain why a sample of solid lead(II) bromide, PbBr2\text{PbBr}_2PbBr2, must be heated until molten before electrolysis can occur.
When concentrated aqueous lithium chloride, LiCl(aq)\text{LiCl(aq)}LiCl(aq), is electrolysed, two gases form at the positive electrode (anode) and one gas forms at the negative electrode (cathode). The ions present in the solution are Li+\text{Li}^+Li+, Cl−\text{Cl}^-Cl−, H+\text{H}^+H+, and OH−\text{OH}^-OH−.
Name the gases formed at each electrode:
Positive electrode: ________ and _______
Negative electrode: ________
Give the ionic half-equations to show the formation of each of these three gases.
The ionic half-equation for the deposition of copper in another cell is:
Cu2++2e−→Cu \text{Cu}^{2+} + 2\text{e}^- \rightarrow \text{Cu} Cu2++2e−→CuDuring this electrolysis, a charge of 0.12 faradays0.12\text{ faradays}0.12 faradays passes through the cell. Calculate the mass of copper metal formed. [Ar(Cu)=63.5][A_r(\text{Cu}) = 63.5][Ar(Cu)=63.5]
