A manufacturer tests a sample from a batch labelled compound K.
| Melting-point data | Temperature |
|---|---|
| Accepted melting point of pure compound K | 121 ∘C121\ ^\circ\text{C}121 ∘C |
| Sample began to melt | 116 ∘C116\ ^\circ\text{C}116 ∘C |
| Sample finished melting | 119 ∘C119\ ^\circ\text{C}119 ∘C |
A technician concludes that the sample is pure compound K.
Evaluate the technician's conclusion.
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.