The figure shows a simple cell that a student made.
Figure: A simple cell made from a zinc electrode and a copper electrode standing in a solution, connected to a meter

Name the piece of apparatus labelled X in the figure.
Name the type of substance labelled Y in the figure.
The student connects three of these cells together in series.
Give the name for two or more cells that are connected together in series.
40 exam-style questions on AQA GCSE Chemistry 5.2 Chemical cells and fuel cells, covering 5.2.1 Cells and batteries, 5.2.2a Fuel cells, and 5.2.2b Half equations for hydrogen fuel cells. Each one has a worked solution and a mark scheme showing where the marks go.