A student makes a simple chemical cell by pushing a strip of zinc and a strip of copper into a lemon. The student then joins several of these lemon cells together in a line (in series) and measures the total voltage.
The table shows the results.
| Number of lemon cells | Total voltage / V |
|---|---|
| 1 | 0.9 |
| 2 | 1.8 |
| 3 | 2.7 |
| 4 | 3.6 |
Name the instrument the student uses to measure the voltage.
State the independent variable in this investigation.
Describe the relationship between the number of lemon cells and the total voltage.
Predict the total voltage produced by 5 lemon cells.
A small lamp needs a voltage of at least 2.0 V to light. Give the smallest number of lemon cells needed to light the lamp.
Suggest one change to the metals in a single lemon cell that would increase its voltage.
38 exam-style questions on Edexcel GCSE Chemistry 6.4 Chemical cells and fuel cells, covering 6.4.1 Chemical cells and fuel cells. Each one has a worked solution and a mark scheme showing where the marks go.