A scientist needs a pure substance that will remain solid in a furnace at 850 ∘C850\ ^\circ\text{C}850 ∘C.
| Substance | Melting point in ∘C^\circ\text{C}∘C |
|---|---|
| P | 640 |
| Q | 1050 |
Which substance should the scientist use? Give a reason for your answer.
Explain, in terms of particles, why Q has a higher melting point than P.
84 exam-style questions on AQA GCSE Chemistry 2.2 How bonding and structure are related to the properties of substances, covering 2.2.1a The three states of matter, 2.2.1b Limitations of the simple particle model, 2.2.2 State symbols in chemical equations, 2.2.3 Properties of ionic compounds, 2.2.4 Properties of small molecules, 2.2.5 Polymers, 2.2.6 Giant covalent structures, 2.2.7 Properties of metals and alloys, and 2.2.8 Metals as conductors. Each one has a worked solution and a mark scheme showing where the marks go.