A wastewater treatment column uses solid catalyst R to convert dissolved substance X into product Y.
The activation energy is 63 kJ/mol without catalyst R and 36 kJ/mol with catalyst R.
A computer model recorded the numbers of collisions in two energy ranges during the same time interval.
| Collision energy range (kJ/mol\text{kJ/mol}kJ/mol) | Number of collisions |
|---|---|
| At least 36 but less than 63 | 350 |
| At least 63 | 190 |
Explain how the collision data show that catalyst R increases the rate of reaction.
Three fresh portions containing the same mass of substance X were passed through the column. The same sample of catalyst R was left in the column for all three batches.
The temperature, concentration, volume and reaction time were identical for each batch.
| Batch | Mass of product Y formed in 5.0 min (g\text{g}g) |
|---|---|
| 1 | 8.42 |
| 2 | 8.39 |
| 3 | 8.44 |
A technician suggested that catalyst R should be replaced after every batch because it becomes less effective.
Explain whether the results support the technician's suggestion.
127 exam-style questions on AQA GCSE Chemistry 6.1 Rate of reaction, covering 6.1.1a Calculating rates of reactions, 6.1.1b Gradient of a tangent as rate, 6.1.2 Factors which affect the rates of chemical reactions, 6.1.3 Collision theory and activation energy, and 6.1.4 Catalysts. Each one has a worked solution and a mark scheme showing where the marks go.