Ethanol can be made by two different reaction pathways. The table shows some information about each pathway.
| Fermentation of sugar | Hydration of ethene | |
|---|---|---|
| Raw material | sugar from crops | ethene from crude oil |
| Temperature (∘C^\circ\mathrm{C}∘C) | 30 | 300 |
| Atom economy (%) | 51 | 100 |
| Rate of reaction | slow | fast |
Which is a reason for choosing fermentation to make ethanol?
It has a higher atom economy.
It is a faster reaction.
It makes ethanol as the only product.
Its raw material is renewable.
57 exam-style questions on OCR GCSE Chemistry 5.1 Monitoring chemical reactions, covering 5.1.1 The technique of titration, 5.1.2 Theoretical mass, percentage yield and atom economy, 5.1.3 Concentration of a solution in mol/dm3, 5.1.4 Concentration calculations and titration results, 5.1.5 Molar gas volume and volumes of gases in reactions, and 5.1.6 Choosing a reaction pathway. Each one has a worked solution and a mark scheme showing where the marks go.