A company compares four power sources for a delivery drone.
| Power source | Energy supplied per kg of power source and fuel (kJ) | Waste products |
|---|---|---|
| Lead-acid battery | 150 | none |
| Lithium battery | 900 | none |
| Hydrogen fuel cell | 1800 | water |
| Methanol fuel cell | 2400 | water and carbon dioxide |
The drone must supply as much energy as possible for each kg carried, without releasing carbon dioxide.
Which power source should the company choose?
Hydrogen fuel cell
Methanol fuel cell
Lithium battery
Lead-acid battery
63 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.