This question is about metals and alloys.
The table gives information about some alloys.
| Alloy | Main metal or metals | Use |
|---|---|---|
| Brass | .........................................................\text{.........................................................}......................................................... | Musical instruments and plumbing joints |
| Bronze | .........................................................\text{.........................................................}......................................................... | Medals and statues |
| Nichrome | .........................................................\text{.........................................................}......................................................... | Heating elements in toasters |
| Solder | Tin and lead | Joining electrical wires |
| Stainless steel | Iron, chromium and nickel | Cutlery and kitchen sinks |
Complete the table by choosing the main metal or metals for Brass, Bronze, and Nichrome from the list below:
The table below gives some information about copper, tin, and a lead-free solder alloy made from them.
| Metal / Alloy | Melting point (∘C^\circ\text{C}∘C) | Density (g/cm3\text{g/cm}^3g/cm3) | Relative strength |
|---|---|---|---|
| Copper | 1085 | 8.96 | Medium |
| Tin | 232 | 7.31 | Low |
| Lead-free solder | 227 | 7.35 | High |
Lead-free solder is preferred over pure copper or pure tin for joining copper pipes together in plumbing. Suggest why, using the information in the table.
Steel is an alloy containing iron. Complete the word equation for the rusting of iron:
Iron+_______________+_______________→Hydrated iron(III) oxide \text{Iron} + \text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_} + \text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_} \rightarrow \text{Hydrated iron(III) oxide} Iron+_______________+_______________→Hydrated iron(III) oxideIron can be protected from rusting by attaching blocks of magnesium to it. This is called sacrificial protection. Explain how magnesium protects iron from rusting.
Describe a disadvantage of using a plastic coating instead of sacrificial protection to prevent iron from rusting.
81 exam-style questions on OCR GCSE Chemistry Improving processes and products. Each one has a worked solution and a mark scheme showing where the marks go.