A student compares two metals using pieces with the same mass and surface area. Each piece is placed in 50 cm³ of excess dilute hydrochloric acid at 20 °C. The acid has the same concentration in both tests. The hydrogen collected after 30 s is shown in the table.
| Metal | Hydrogen volume after 30 s / cm³ |
|---|---|
| Calcium | 24 |
| Magnesium | 8 |
Which statement is supported by the results?
Calcium and magnesium have the same reactivity because both produced hydrogen.
The metals reacted at different rates, but the results cannot compare their reactivities.
Calcium is more reactive than magnesium because it produced more hydrogen in 30 s.
Magnesium is more reactive than calcium because it produced less hydrogen in 30 s.
86 exam-style questions on AQA GCSE Chemistry 4.1 Reactivity of metals, covering 4.1.1 Metal oxides, 4.1.2 The reactivity series, 4.1.3 Extraction of metals and reduction, and 4.1.4 Oxidation and reduction in terms of electrons. Each one has a worked solution and a mark scheme showing where the marks go.