chromotography

• The mobile phase is the liquid or gas that carries the sample through the column.
• define a pure substance?

  A substance that is made up of only one type of particle or molecule.
• how can you distinguish a pure substance from and impure substance?


  Physical properties such as melting point, boiling point
• what is a formulation?

  A formulation is a specific combination of ingredients and their quantities used to create a product or solution.
• give some examples of formulation

  medicines, foods, paints, cleaning products, alloys
• what does chromotography separate?

  inks from dyes
• what is the equation for the Rf value?

  Rf= distance moved by substance / distance moved by solvent
• what colour does litmus go if chlorine is present?

  white
• what are the two phases of chromotography?

  mobile and stationary
• what is the mobile phase?

  The solvent or liquid that carries the sample through the chromatography system.
• what is the stationary phase?


  it is the absorbent paper
• name the four gas tests?

  hydrogen, oxygen, carbon dioxide, chlorine
• what is the test for oxygen?

  relights a glowing splint
• what is the test for hydrogen?


  makes a squeaky pop sound
• what is the test for carbon dioxide?

  Lime water test.
• what is the gas test for chlorine?


  turns litmus paper white