An enzyme in yeast catalyses the conversion of glucose during fermentation.
For a fixed amount of glucose, the highest energy on the catalysed route is 250 kJ. The activation energy for the catalysed route is 135 kJ and the overall energy change from reactants to products is -50 kJ.
Four students identify the energy levels of the reactants and products.
| Student | Energy level of reactants in kJ | Energy level of products in kJ |
|---|---|---|
| Priya | 385 | 335 |
| Tom | 115 | 165 |
| Kai | 115 | 65 |
| Ella | 250 | 200 |
Which student has correctly identified both energy levels?
Priya
Kai
Tom
Ella
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.