A scientist tests four solid samples.
| Sample | Appearance | Electrical conductivity | Result when hammered | Melting point in °C |
|---|---|---|---|---|
| P | Shiny | Good | Forms a thin sheet | 1085 |
| Q | Dull | Poor | Breaks into pieces | 114 |
| R | Shiny | Good | Forms a thin sheet | 660 |
| S | Dull | Poor | Breaks into pieces | 250 |
Explain which two samples are most likely to be metals.
An electrical contact will operate at 700 °C. The material used must remain solid at this temperature.
Which of the two metals should be used? Justify your answer.
82 exam-style questions on AQA GCSE Chemistry 1.2 The periodic table, covering 1.2.1 The periodic table, 1.2.2 Development of the periodic table, 1.2.3 Metals and non-metals, 1.2.4 Group 0, 1.2.5 Group 1, and 1.2.6 Group 7. Each one has a worked solution and a mark scheme showing where the marks go.