A scientist wants to make copper using electrolysis. They consider two different electrolysis experiments using inert electrodes as shown in the table:
| Experiment 1 | Experiment 2 | |
|---|---|---|
| Electrolyte | molten copper(II) chloride | copper(II) sulfate solution |
| Electrode the scientist collects product from | anode | cathode |
a.[3]
Predict and explain what will be made at the electrode the scientist collects the product from in each experiment. Determine which experiment the scientist should use to make copper.
b.[2]
Another scientist investigates the electrolysis of lead(II) bromide.
The diagram shows their experiment:
The experiment does not make any lead.
State two changes the scientist should make so that lead is made.
c.[2]
Complete the balanced half equation for the production of bromine from bromide ions.
2Br−−……………→……………2\text{Br}^- - \text{\dots\dots\dots\dots\dots} \rightarrow \text{\dots\dots\dots\dots\dots}2Br−−……………→……………