Seperation methods

• What is a mixture?

  A substance made of more than one thing not chemically bonded together
• Why do we use filtration?

  To seperate a insoluble solid and a liquid
• In filtration, what do we call the solid left behind on the filter paper?

  Residue
• What is a solute?

  A solid that can dissolve in a solvent
• What is a solvent?

  A chemical that can dissolve other substances
• What is a solution?

  A liquid mixture made of a solute dissolved in a solvent
• What are the steps in crystillisation?

  1-Pour the solution into an evaporating basin

  2-Warm the solution gently over boiling water

  3-Stop heating before all water evaporates

  4-Let remaining water evaporate overnight or put in a drying oven
• What are the steps in filtration?

  1-Put a piece of filter paper in a funnel and put a funnel over a beaker

  2-Pour your mixture through the funnel

  3-Any insoluble solids will be caught by the filter paper, (residue)

  4-Any liquid or dissolved substances will pass through, (filtrate)
• What is evaporation used for?

  To seperate a dissolved solid from a liquid
• What are the steps for evaporation?

  1-Heat your solution until all of the solvent evaporates, and only the solid remains
• How would you isolate the sand and salt from a mixture of salt and sand?

  1-Grind the mixture to assist the sand and salt to dissolve

  2-Put the mixture in water and stir (the salt will dissolve not the sand)

  3-Pour the mixture through the filter paper and funnel. The sand will get stuck on the filter paper

  4-Evaporate the water from the salt to form dry salt crystals
• What is a pure substance?

  A substance with only one type of element or compound?
• What does soluble mean?

  Can dissolve in a solvent
• What does insoluble mean?

  a solid that can't dissolve in a solvent