A manufacturer has shortlisted process A and process B for producing a pigment used in printing inks. Their operating data are summarised below.
| Process A | Process B | |
|---|---|---|
| Atom economy (%) | 58 | 91 |
| Percentage yield (%) | 84 | 62 |
| Temperature (∘C^\circ\mathrm{C}∘C) | 45 | 280 |
Statement 1: The atom economy data indicate that a smaller proportion of reactant mass becomes by-products in process A.
Statement 2: The yield results show that process B produces a larger fraction of its theoretical maximum than process A.
Statement 3: If reducing the energy needed to heat the reaction mixture is the priority, the operating temperature favours process A.
Which statements are correct?
Statement 3 only
Statement 2 only
Statements 2 and 3 only
Statements 1 and 3 only
152 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.