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Atom economy
Percentage yield
Rate
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Use made of by-products

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raw materials.","mcqOptions":null},{"id":"a3a3fc65-4542-4a80-8618-fb5e64aa4464","cardType":"basic","points":2,"front":"How does feeding a by-product back into the process affect the cost?","back":"It reduces the amount of material that must be bought in.","mcqOptions":null},{"id":"0cff018a-dfc8-42b9-a5cf-6a1146a1ae70","cardType":"basic","points":2,"front":"When does rate matter more than atom economy and yield?","back":"When demand is high and the material is cheap.","mcqOptions":null},{"id":"a2a63794-77e8-49e8-964b-aaa6f83901ab","cardType":"cloze","points":null,"front":"The five measures used to compare reaction pathways include [ ], percentage yield, rate, equilibrium position and by-product use.","back":"The five measures used to compare reaction pathways include atom economy, percentage yield, rate, equilibrium position and by-product use.","mcqOptions":null},{"id":"979cff89-aba9-48eb-9d90-c4daed552183","cardType":"cloze","points":null,"front":"Atom economy is fixed by the [ ], whereas percentage yield is found by measuring the product recovered.","back":"Atom economy is fixed by the equation, whereas percentage yield is found by measuring the product recovered.","mcqOptions":null},{"id":"cee5bed3-50e1-49a8-a988-ed280ecbe21c","cardType":"cloze","points":null,"front":"A by-product treated as [ ] adds a disposal cost, whereas a saleable by-product can offset raw-material costs.","back":"A by-product treated as waste adds a disposal cost, whereas a saleable by-product can offset raw-material costs.","mcqOptions":null},{"id":"d9b44eb6-78cf-4e2e-8d22-3972142524e1","cardType":"cloze","points":null,"front":"Steam produced by an exothermic route can be used to [ ] another part of the plant.","back":"Steam produced by an exothermic route can be used to heat another part of the plant.","mcqOptions":null},{"id":"cfd186ae-488a-4c7b-9a7a-9b020d9b4fd5","cardType":"cloze","points":null,"front":"When raw materials are expensive, [ ] and yield carry the most weight.","back":"When raw materials are expensive, atom economy and yield carry the most weight.","mcqOptions":null},{"id":"2c363370-4844-4375-9729-8f5662db4f5c","cardType":"cloze","points":null,"front":"A sound comparison states which route wins on each measure, then explains which measures [ ] the others.","back":"A sound comparison states which route wins on each measure, then explains which measures outweigh the others.","mcqOptions":null}]}],"examCountdown":{"examDate":"2027-05-17","paperLabel":"Paper 1"},"heading":"6.2.4 Choosing a reaction pathway","title":"6.2.4 Choosing a reaction pathway Flashcards","topbar":{"backHref":"/gcse/chemistry/edexcel/flashcards"},"topicSidebar":"$L36"}]}],"topicId":"0592d01c-27ba-5cc3-9e02-50e7316471e5","walled":"$L37"}],"$L38","$L39"]