Why medicines are expensive 3.0 / 5 based on 1 rating ? ChemistryGCSEAQA Created by: Belle StoreyCreated on: 12-01-13 08:24 How long does it take or a drug to develop and why? about 10 years - needs to be tested and each country has strict safety laws that pharmaceutical companies must follow 1 of 9 What needs to be made before one compound can be useful to develop? many compounds 2 of 9 What is a disadvantage of using raw materials? they are rare and costly. many are found in plants and are difficult to extract 3 of 9 What is the first step of extracting a chemical from a plant? crushing to disrupt and break cell walls 4 of 9 What is the second step of extracting a chemical from a plant? boiling in a suitable solvent to dissolve the compounds 5 of 9 What is the third step of extracting a chemical from a plant? chromatography to separate and identify individual compounds 6 of 9 What is the fourth step of extracting a chemical from a plant? isolating, purifying and testing potentially useful compounds 7 of 9 What do pure compounds have? definite melting points and boiling points 8 of 9 What is thin layer chromatography used to do? test the purity of a compound by comparing the speed of movement against a known pure sample 9 of 9
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