REVISION

REVISION

1. A mixture contains 2 or more substances that are put together.

   • It can be separated by a physical method.
   • Separating an insoluble substances from a liquid.

2. Crystalisation is done by carefully heating the solution so that the liquid evaporates. This leaves crystal of the solid behind. The crystal can be washed with cold water to remove the crystals.

   • Crystallization is also a chemical solid–liquid separation technique, in which mass transfer of a solute from the liquid solution to a pure solid crystalline phase occurs.
   • Crystallization is defined as a process by which a chemical is converted from a liquid solution into a solid crystalline state.

3. Chromotography is is used to separate mixtures of different colours (like pen inks or food colourings)

   • A mixture of dyes will be separated out as a solvent (a liquid) rises up the paper.
   • Its also a way to separate soluble substances.