A manufacturer investigates the effect of substance X on a chemical reaction. Both trials use the same amounts of reactants at the same temperature. After trial 2, substance X is separated from the reaction mixture and dried.
| Trial | Mass of X added | Time for reaction to finish | Mass of X recovered |
|---|---|---|---|
| 1 | 0.0 g | 120 s | Not applicable |
| 2 | 2.0 g | 40 s | 2.0 g |
A scientist claims that substance X acted as a catalyst. The recovered substance X is then added to a fresh batch of the reactants under the same conditions.
Explain whether the results support the scientist's claim. Predict the time taken for the fresh batch of reactants to finish reacting.
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.