Chemistry Paper 2- Chemical Analysis

Purity and Formulations

Pure substance can be a single element/ single compound

PURE = NOT MIXED

Pure substance melts at a specific fixed temperature with a specific fixed boiling point

Impure substance melts and boils over a range of temperatures

straight line on a graph = pure substance ------ diagonal on a graph = impure substance

Formulation = complex mixture that has been designed as a useful product

     > the quantity of each component is carefully measured so that the product has the properties we need

     > examples = fuels, cleaning products, paints, medicines, alloys, fertilizers and food

Paper Chromatography

Other ways of separating mixtures-

   >filtration

   >Crystallisation

   >Distillation

   >Chromatography

THESE ARE ALL PHYSICAL PROCESSES…