A technician tests two metal strips with the same dimensions. The strips are bent until they have the same permanent change of shape. The force needed is recorded.
| Strip | Composition | Force needed |
|---|---|---|
| P | pure iron | 18 N |
| Q | steel | 42 N |
The strips are being considered for a component that must resist changing shape.
Explain why the force needed to bend strip Q is greater than the force needed to bend strip P. Give the strip that is more suitable for the component and justify your choice.
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.