A washing powder contains an enzyme that catalyses reactions which break down food stains.
The table shows the activation energy for two possible reaction pathways.
| Reaction pathway | Activation energy (kJ/mol\text{kJ/mol}kJ/mol) |
|---|---|
| P | 68 |
| Q | 34 |
State which reaction pathway is provided by the enzyme.
Give one reason, in terms of collisions, why the enzyme increases the rate of the reaction.
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.