A polymer spacer is used beside a heating unit. The spacer normally reaches 160 °C, but it may reach 220 °C if the unit overheats. The spacer must retain its shape at both temperatures.
A manufacturer tests two polymer samples.
| Sample | Observation at 160 °C | Observation at 220 °C |
|---|---|---|
| P | Retains its shape | Melts |
| Q | Retains its shape | Retains its shape |
Explain which sample should be used for the spacer and whether the test results alone establish if offcuts of the chosen sample can be melted and remoulded.
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.