An automatic weather station has two separate power systems. A fully charged rechargeable chemical cell continues to power the station after its charger is disconnected. A hydrogen–oxygen fuel cell stops powering the station when its hydrogen supply is interrupted, although oxygen from the air is still available.
Explain these two observations in terms of the reactants in each power system.
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.