AQA GCSE Chemistry · 8462
Specification 4.3.3.2 · Paper 1
Revise: Atom EconomySome may enter other products, called by-products.
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GCSE Chemistry · key term
A product formed alongside the desired product.
Used by AQA, Edexcel and OCR
Specification 4.3.3.2 · Paper 1
Revise: Atom EconomySome may enter other products, called by-products.
Specification 5.13C, 5.14C, 5.15C · Paper 1
A product formed alongside the desired product and not regarded as the main purpose of the reaction.
Revise: Atom Economy DefinitionChemists may want one of them—the desired product—while the others are by-products.
A product formed alongside the desired product in a chemical reaction.
A substance formed alongside the desired product in a reaction.
A product formed in addition to the desired product; it may be waste or may have a useful application.
Specification CM5.1v, C5.1i, C5.1k · Paper 2 (Foundation), Paper 4 (Higher)
An additional product formed alongside the desired product.
Revise: Yield and Economy CalculationsSome may enter other products, called by-products.
A product formed alongside the desired product; it may be unwanted or may itself have a useful purpose.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A product formed alongside the desired product in a reaction.
Revise: Atom economy definitionImagine a reaction that forms a useful salt as well as an unwanted by-product. The atoms incorporated into the useful salt contribute to the atom economy; those incorporated into the unwanted product do not. A reaction has a high atom economy when most of the reactant atoms enter the desired product, and a low atom economy when a substantial proportion enters other products.
A product formed in addition to the desired product.
A product formed alongside the desired product of a process; it may be useful rather than discarded.
A substance formed alongside the desired product that may be useful in another process.
A useful by-product does not change the calculated atom economy, but it can reduce waste and make a low-atom-economy pathway more worthwhile.
A useful by-product may reduce waste and earn money, but it does not change the calculated atom economy for the specified desired product.
A useful by-product may reduce waste or provide income, but using it does not change the reaction’s calculated atom economy.
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