Chemical Analysis 0.0 / 5 ? ChemistryAnalysing substancesGCSEAQA Created by: DJ RePlayCreated on: 17-10-17 17:34 What does the term 'pure' mean? A pure substance contains only one type of element or one type of compound 1 of 6 What is an 'impure' substance? An impure substances are mixtures - they don't melt and boil at one temperature - they change state over a range of temperatures 2 of 6 What is a 'formulation'? A formulation is a mixture that have been carefully designed to have a specific properties 3 of 6 Give an example of a formulation fuels, cleaning agents, paints, medicines 4 of 6 What are the phases of chromatography? The stationary phase- which does not move. The mobile phase- which does move 5 of 6 How do you calculate Rf values? Rf = distance travelled by substance / distance travelled by solvent 6 of 6
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