A company is choosing a polymer to make reusable baby bottles. The bottles are sterilised in boiling water at 100 °C.
The table shows information about four polymers.
| Polymer | Softening temperature / °C | Flexibility | Can you see through it? | Cost per kg / £ |
|---|---|---|---|---|
| poly(ethene) | 85 | very flexible | yes | 1.10 |
| poly(propene) | 150 | stiff | yes | 1.20 |
| PVC | 80 | stiff | yes | 1.00 |
| PTFE | 327 | stiff | no | 12.00 |
Name the two polymers in the table that would soften in boiling water.
Calculate how many times more expensive PTFE is than poly(propene).
Name the monomer used to make poly(propene).
Evaluate which polymer in the table is the most suitable for making reusable baby bottles. Use the information in the table to support your answer.
37 exam-style questions on Edexcel GCSE Chemistry 10.3 Polymers, covering 10.3.1 Addition polymerisation of alkenes, 10.3.2 Uses and properties of polymers, 10.3.3 Condensation polymers and polyesters, 10.3.4 Problems with polymers and recycling, and 10.3.5 Natural polymers: DNA, starch and proteins. Each one has a worked solution and a mark scheme showing where the marks go.