A pure material, P, is being assessed for a moulding process. At the filling stage, the material is at 60 ∘C60\,^\circ\mathrm{C}60∘C and must flow to take the shape of the mould while keeping the same volume. At the storage stage, the material is at 20 ∘C20\,^\circ\mathrm{C}20∘C and must keep its own shape.
The table gives data for material P. The data are for normal atmospheric pressure.
| Property | Temperature (∘C^\circ\mathrm{C}∘C) |
|---|---|
| Melting point | 42 |
| Boiling point | 180 |
Evaluate whether material P is suitable for this moulding process. Use the data and the particle model.
A fault raises material P from the filling temperature to 195 ∘C195\,^\circ\mathrm{C}195∘C. Explain the change in its particle model.
93 exam-style questions on OCR GCSE Chemistry 1.1 The particle model, covering 1.1.1 The particle model and changes of state and 1.1.2 Limitations of the particle model. Each one has a worked solution and a mark scheme showing where the marks go.