Three iron-based materials were tested for hardness and melting point. Which conclusion follows from the results?
| Material | Hardness in arbitrary units | Melting point in ∘C^\circ\text{C}∘C |
|---|---|---|
| Pure iron | 50 | 1538 |
| Steel A | 110 | 1450 |
| Steel B | 85 | 1480 |
Steel B is softer than pure iron and has a higher melting point than pure iron
Steel A is harder than pure iron and has a higher melting point than pure iron
Steel B is softer than pure iron and has a lower melting point than pure iron
Steel A is harder than pure iron and has a lower melting point than pure iron
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.