A student adds magnesium and zinc to separate samples of the same dilute hydrochloric acid.
| Metal | Mass (g) | Form of metal | Observation |
|---|---|---|---|
| Magnesium | 0.5 | one piece of ribbon | steady bubbling |
| Zinc | 0.5 | fine powder | rapid fizzing |
The student concludes that zinc is more reactive than magnesium.
Which statement about the conclusion is correct?
It is valid, because zinc fizzed faster than magnesium.
It is not valid, because the zinc powder had a much larger surface area than the magnesium ribbon.
It is not valid, because the same mass of each metal was used.
It is valid, because both metals reacted with the same acid.
60 exam-style questions on OCR GCSE Chemistry 4.1 Predicting chemical reactions, covering 4.1.1 Properties and trends in Groups 1, 7 and 0, 4.1.2 Properties of the transition metals, 4.1.3 Reactivity predicted from position in the Periodic Table, and 4.1.4 Reactivity of metals and the reactivity series. Each one has a worked solution and a mark scheme showing where the marks go.