An example of a formulation - paint, A definition of a formulation - A mixture designed for a specific purpose , A definition of a pure substance  - Contains only 1 element or compound, Melting point of a pure substance - Substance will melt at an specific point, Melting point of an impure substance - melts over a melting point range , Impurities - Raise the boiling point and lower the melting point, Chromatography - Separates soluble coloured mixtures , mobile phase - This is the solvent as it moves through the paper, stationary phase - The chromatography paper, Dissolved substances are attracted to the different phases in different proportions, which makes them move at different rates up the paper  - How does chromatography work?, Look at the melting or boiling point - How do you work out a substance is pure or impure?, By mixing components in specific quantities - How are formulations made?, distance of moved by substance/distance moved by solvent  - Rf value, produces one spot - A pure substance on a chromatogram,

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