A student wants to copper-plate an iron nail using copper(II) sulfate solution. By mistake, the student connects the nail to the positive terminal and a strip of copper to the negative terminal.
What does the student observe?
The nail becomes coated with copper.
The copper strip gains mass and the nail loses mass.
The copper strip loses mass and the nail gains mass.
Bubbles of oxygen form on the nail and the copper strip loses mass.
52 exam-style questions on OCR GCSE Chemistry 3.4 Electrolysis, covering 3.4.1 Products formed at the electrodes in electrolysis and 3.4.2 The technique of electrolysis. Each one has a worked solution and a mark scheme showing where the marks go.