A reaction has 60% atom economy but 90% yield. Which statement is correct?
Most of the expected product forms, and few reactant atoms end up as waste
Most of the expected product forms, but many reactant atoms end up as waste
Little of the expected product forms, and few reactant atoms end up as waste
Little of the expected product forms, and many reactant atoms end up as waste
51 exam-style questions on Edexcel GCSE Chemistry 6.2 Quantitative analysis, covering 6.2.1 Concentration in mol dm⁻³ and titration calculations, 6.2.2 Percentage yield and why actual yield falls short, 6.2.3 Atom economy of a reaction, 6.2.4 Choosing a reaction pathway, and 6.2.5 Molar volume of gases and Avogadro's law. Each one has a worked solution and a mark scheme showing where the marks go.