A student investigates how the proportion of zinc affects the tensile strength of copper-zinc alloys (brass). The results are shown in Table 1.
Table 1
| Percentage by mass of zinc in alloy (%) | Tensile strength of alloy (MPa) |
|---|---|
| 0 | 220 |
| 5 | 240 |
| 10 | 260 |
| 15 | 280 |
| 20 | 300 |
| 25 | 315 |
| 30 | 330 |
| 35 | 350 |
Determine the percentage by mass of copper in a copper-zinc alloy with a tensile strength of 312 MPa.
97 exam-style questions on Edexcel GCSE Chemistry 6.1 Transition metals, alloys and corrosion, covering 6.1.1 Properties of transition metals, 6.1.2 Corrosion and its prevention, and 6.1.3 Alloys and the uses of metals. Each one has a worked solution and a mark scheme showing where the marks go.