A student investigates the effect of adding a solid substance, X, on the rate of a reaction.
The reaction is repeated under the same conditions each time, except for the solid added. In experiment 3, the solid recovered at the end of experiment 2 is used with fresh reactants.
| Experiment | Solid added | Mass of solid added in g | Time taken for the reaction to finish in s | Mass of solid recovered in g |
|---|---|---|---|---|
| 1 | none | — | 240 | — |
| 2 | fresh X | 1.80 | 75 | 1.80 |
| 3 | X recovered from experiment 2 | 1.80 | 75 | 1.80 |
Explain whether X is acting as a catalyst. Use the data in the table.
State whether X should be written on the left-hand side, the right-hand side, or neither side of the equation for this reaction.
122 exam-style questions on Edexcel GCSE Chemistry 8.1 Rates of reaction, covering 8.1.1 Measuring and interpreting rates of reaction, 8.1.2 Collision theory and the factors affecting rate, and 8.1.3 Catalysts and enzymes. Each one has a worked solution and a mark scheme showing where the marks go.