The table below shows information about some properties of four substances, labeled A, B, C, and D:
| Substance | Melting point (∘C^\circ\text{C}∘C) | Boiling point (∘C^\circ\text{C}∘C) | Solubility in water | Does the substance conduct electricity? |
|---|---|---|---|---|
| A | −95-95−95 | 565656 | Soluble | No |
| B | −117-117−117 | 787878 | Soluble | No |
| C | 801801801 | 146514651465 | Soluble | Only when molten or dissolved |
| D | 153815381538 | 286228622862 | Insoluble | Yes |
Which separation technique should be used to separate a mixture of substance A and substance B?
Describe a method that could be used to separate a mixture of solid substance C and solid substance D to obtain pure samples of both.
A student separates substance C from a mixture. They start with 8.4 g8.4\text{ g}8.4 g of the mixture and obtain 2.9 g2.9\text{ g}2.9 g of pure substance C. Calculate the mass of pure substance C that could be obtained from 15.0 g15.0\text{ g}15.0 g of the mixture. Give your answer to 3 significant figures.
Match each of the substances A, C, and D with its correct type of structure and bonding. Choose from: Giant Covalent, Ionic, Metallic, Polymer, Simple Covalent.
46 exam-style questions on OCR GCSE Chemistry Purity and separating mixtures. Each one has a worked solution and a mark scheme showing where the marks go.