A researcher investigates solid P in a manufacturing process that produces a gas. The same amounts of reactants are used at the same temperature in each experiment.
| Solid added | Time taken to collect 100 cm³ of gas in s | Mass of solid added in g | Mass of solid recovered in g |
|---|---|---|---|
| None | 240 | – | – |
| P | 75 | 1.80 | 1.80 |
Solid P contains a metal, M. The table gives some properties of M and its compounds.
| Property | Result |
|---|---|
| Hardness | Hard |
| Density | 8.90 g/cm³ |
| Melting point | 1455 °C |
| Charges on ions formed | +2 and +3 |
| Appearance of compounds | Coloured |
Give two reasons why the results show that solid P acted as a catalyst.
Name the block of the periodic table in which M is most likely to be found.
Give one physical property and one property of its ions or compounds that support your answer.
91 exam-style questions on AQA GCSE Chemistry 1.3 Properties of transition metals, covering 1.3.1 Comparison with Group 1 elements and 1.3.2 Typical properties of transition metals. Each one has a worked solution and a mark scheme showing where the marks go.