A canal boat is powered by rechargeable batteries. Its owners used to charge the batteries with electricity from a power station that burns natural gas. They now charge the batteries only with electricity from wind turbines.
Why does this change reduce the overall amount of carbon dioxide released by using the boat?
Electricity from wind turbines charges the batteries more fully, so they last longer.
Electricity from wind turbines gives the cells a higher voltage, so less charge is used.
Generating the charging electricity no longer involves burning a fuel that contains carbon.
The batteries now give out less carbon dioxide while they are powering the boat.
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.