In chemistry, the word pure has a different meaning from its everyday meaning.
Give the meaning of the term pure substance in chemistry.
A sample of copper contains only copper atoms.
Name the type of pure substance that copper is.
Table shows the results of heating four solids, A, B, C and D, until they melted.
Table: The temperature or temperature range over which each of the four solids, A, B, C and D, melted
| Solid | Temperature at which the solid melted in ∘C^\circ\text{C}∘C |
|---|---|
| A | 44 |
| B | 61 to 78 |
| C | 113 |
| D | 156 |
Use Table.
Give the letter of the solid that is a mixture.
40 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.