A manufacturer is developing a simple cell for a greenhouse temperature sensor.
The metals available are shown in order of decreasing reactivity:
magnesium, zinc, copper
The manufacturer plans to test three cells. Apart from the electrode metals and electrolyte shown in the table, all conditions will be kept the same.
| Cell | Electrode metals | Electrolyte |
|---|---|---|
| P | magnesium and copper | X |
| Q | zinc and copper | X |
| R | magnesium and copper | Y |
Give the two cells that should be compared to find out whether changing the electrolyte changes the voltage.
The manufacturer compares cells P and Q. State the factor being investigated.
Cells P and Q use the same electrolyte under the same conditions. State which cell is expected to produce the larger voltage.
90 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.