A manufacturer checks the purity of a batch of a compound used to make a polymer.
The table shows the accepted melting point of the pure compound and the measured melting point of the batch.
| Melting point | Temperature in ∘C^\circ\text{C}∘C |
|---|---|
| Accepted value for the pure compound | 146 |
| Measured value for the batch | 139 |
Give a conclusion about the purity of the batch.
113 exam-style questions on AQA GCSE Chemistry 8.1 Purity, formulations and chromatography, covering 8.1.1 Pure substances, 8.1.2 Formulations, and 8.1.3 Chromatography. Each one has a worked solution and a mark scheme showing where the marks go.