An engineer is choosing the second electrode for a simple cell used in a portable parcel scale. One electrode is made of iron. The available metals, in order of decreasing reactivity, are iron, nickel, tin, copper and gold. The same electrolyte and conditions will be used for each possible cell. Which metal should the engineer use for the second electrode to produce the largest voltage?
Copper
Tin
Nickel
Gold
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.