A sealed chemical cell powers a transmitter on a monitoring buoy. The table shows the masses of two reactants when the cell starts and when it stops producing a potential difference after 40 hours.
| Time in hours | Mass of zinc in g | Mass of manganese(IV) oxide in g |
|---|---|---|
| 0 | 2.0 | 8.0 |
| 40 | 0.0 | 2.7 |
Explain why the cell stops producing a potential difference after 40 hours and whether starting with twice the mass of manganese(IV) oxide, but the same mass of zinc, would allow the cell to operate for longer.
131 exam-style questions on OCR GCSE Chemistry 6.2 Organic chemistry, covering 6.2.1 Crude oil and fractional distillation, 6.2.2 Cracking and dependence on hydrocarbons, 6.2.3 Functional groups and homologous series, 6.2.4 Reactions of alkanes, alkenes and alcohols, 6.2.5 Addition polymerisation and repeat units, 6.2.6 Naturally occurring polymers, 6.2.7 Chemical cells and fuel cells, and 6.2.8 Condensation polymerisation and how to make one. Each one has a worked solution and a mark scheme showing where the marks go.