States of matter - separating and purifying substances

• Paper chromatography


  1. Separation of mixtures of soluble substances

  2. Running a solvent (mobile phase) through the mixture on the paper (stationary phase)

  3. Substances move at different rates over the paper
• Pure substance


  A single substance with a fixed composition that does not have anything else mixed with it
• Mixture


  A substance containing two or more different substances that are not chemically joined together