Purity & formulations

• What makes something "pure"?

  It has only one element/compound
• Pure substances have a.....


  Fixed boiling/melting point
• Unpure substances have a

  Range of boiling/melting points
• Formulation are..


  Mixtures designed for a useful product(e.g paint, cleaning agents)
• What is paper chromatography?

  Separates substances based of their solubilites
• Rf value


  Distance of substance/Distance of solvent
• In chromatography different....


  Solvents produce different Rf values
• How Far solvents travel in chromatography depends on..

  It's attraction to the paper