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Spec 8462
Study AQA GCSE Chemistry 3.3 Yield and atom economy of chemical reactions for Foundation and Higher tier. Use the question bank and revision guides below to learn the topic, practise key skills, and check your understanding. These resources are matched to the AQA GCSE Chemistry (8462) specification.
Even though no atoms are gained or lost in a chemical reaction, it is not always possible to obtain the calculated amount of a product because: • the reaction may not go to completion because it is reversible • some of the product may be lost when it is separated from the reaction mixture • some of the reactants may react in ways different to the expected reaction. • The amount of a product obtained is known as the yield. When compared with the maximum theoretical amount as a percentage, it is called the percentage yield. Mass of product actually made % Yield = Maximum theoretical mass of product × 100 Students should be able to: • calculate the percentage yield of a product from the actual yield of a reaction