Blocks of zinc are bolted onto the steel hull of a ship. The blocks stop the hull rusting.
Explain, in terms of reactivity, how the blocks of zinc stop the steel hull rusting.
The blocks of zinc have to be replaced every few years.
Explain why.
A steel bin is coated with a thin layer of zinc. The coating is scratched so that the steel underneath is exposed.
Explain why the steel still does not rust.
40 exam-style questions on AQA GCSE Chemistry 10.3 Using materials, covering 10.3.1 Corrosion and its prevention, 10.3.2 Alloys as useful materials, and 10.3.3 Ceramics, polymers and composites. Each one has a worked solution and a mark scheme showing where the marks go.