An engineer tests identical pieces of metal mesh used in a rainwater filter. All the pieces are made from the same metal.
After 14 days, the coating in Test 1 is identified as rust.
| Test | Oxygen present | Water present | Mass of coating after 14 days in g |
|---|---|---|---|
| 1 | Yes | Yes | 0.24 |
| 2 | No | Yes | 0.00 |
| 3 | Yes | No | 0.00 |
Which metal is the mesh made from?
Explain the results for the mass of coating in Tests 1, 2 and 3.
The metal mesh is protected with paint.
Predict what will happen if the paint is scratched while the mesh is wet and exposed to air.
Explain your answer.
118 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.