This is a concise, fast-paced lesson which guides students through the critical skills needed to calculate the atom economy of a chemical reaction. It has been designed for GCSE students and focuses on the calculation as well as interpreting the final value. In order to calculate the mass of the desired product and other products, students have to be able to calculate the relative formula mass - therefore time is taken to revisit these skills and worked examples are used with this and the actual calculations to enable the students to visualise how they should set their work out. The lesson finishes with some progress check questions where students are challenged to state which of four chemical reactions has the highest atom economy. This lesson could be taught in combination with the percentage yield topic and an accompanying lesson on that calculation is available on this site.
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