A product can be made by route X or route Y. The table shows some information about each route.
| Route X | Route Y | |
|---|---|---|
| Atom economy (%) | 100 | 64 |
| Percentage yield (%) | 35 | 92 |
| Temperature (∘C^\circ\mathrm{C}∘C) | 450 | 60 |
Statement 1: Route Y needs less energy to keep the reaction mixture at its operating temperature.
Statement 2: Route X makes no waste products.
Statement 3: Route Y has a higher atom economy than route X because its percentage yield is higher.
Which statements are correct?
1 only
1 and 2 only
2 and 3 only
1, 2 and 3
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.